Food from Plants and Animals MCQ

Explanation: The question focuses on identifying the Disease that develops when the human body does not receive sufficient protein through Food for a long period.

Proteins are essential macronutrients responsible for growth, tissue repair, enzyme production, hormone formation, and immune system support. They are made up of amino Acids that act as the building blocks of body tissues. During childhood especially, protein intake is critical because the body undergoes rapid development.

When dietary protein is severely insufficient, the body cannot maintain muscle tissues or produce necessary proteins required for metabolism and immunity. Gradually, symptoms such as muscle wasting, swelling of body parts, stunted growth, fatigue, and weakened resistance to infections may develop.

Consider a child whose daily meals consist mostly of carbohydrate-rich foods like rice or bread but very little protein from pulses, milk, eggs, or legumes. Over time, the lack of protein prevents proper growth and tissue repair.

Thus, the question asks you to recognize the specific nutritional disorder associated with prolonged protein deficiency in the diet.

Explanation: This question examines the Health problem that arises when the body does not obtain enough vitamin A through diet.

Vitamin A is a fat-soluble vitamin essential for several biological processes. One of its most important roles is maintaining healthy vision. It supports the retina in the eye, which contains Light-sensitive cells responsible for detecting Light and converting it into signals interpreted by the brain.

If vitamin A intake remains inadequate for a prolonged period, the retina cannot function properly, especially under low-Light conditions. People may begin experiencing difficulty seeing in dim Light or during nighttime. Continued deficiency can also lead to dryness of the eyes and damage to eye tissues.

For example, individuals whose diet rarely includes foods such as carrots, spinach, dairy products, eggs, mangoes, or sweet potatoes may gradually experience symptoms related to insufficient vitamin A intake.

The purpose of this question is to identify the eye-related disorder associated with long-term vitamin A deficiency that affects normal vision.

Explanation: This question asks about the vitamin whose deficiency leads to a particular type of anemia related to abnormal red blood cell formation.

Vitamins belonging to the B-complex group play an important role in metabolism and blood cell production. Certain vitamins are essential for the proper development and maturation of red blood cells in the bone marrow. These cells are responsible for transporting oxygen throughout the body.

When the body does not obtain enough of the required vitamin, red blood cells may become unusually large and function inefficiently. As a result, the oxygen-carrying capacity of blood decreases. Symptoms such as fatigue, weakness, shortness of breath, pale skin, and neurological disturbances may appear.

This condition occurs because the body cannot properly synthesize healthy red blood cells without the required vitamin. It may result from poor dietary intake or problems with absorption in the digestive system.

For instance, individuals who avoid certain Animal-based foods or have absorption disorders may gradually develop this form of anemia.

The question therefore requires identifying the vitamin whose deficiency interferes with normal red blood cell formation.

Explanation: The question is about distinguishing between different types of vitamins based on how they dissolve and are stored in the body.

Vitamins are broadly categorized into two groups: fat-soluble vitamins and water-soluble vitamins. Fat-soluble vitamins dissolve in fats and oils and can be stored in body tissues for longer periods. In contrast, water-soluble vitamins dissolve in water and are not stored extensively in the body.

Because water-soluble vitamins are not retained for long durations, they must be consumed regularly through Food. Excess amounts are usually excreted through urine rather than stored. These vitamins commonly play important roles in energy metabolism, nerve function, and enzyme activity.

Foods such as whole grains, legumes, fruits, and vegetables are major dietary sources of many water-soluble vitamins. Since they are easily lost during cooking or storage, maintaining a balanced diet becomes important for adequate intake.

This question therefore asks you to identify which vitamin among the options belongs to the water-soluble category rather than the fat-soluble group.

Explanation: This question refers to a classic experiment used in plant physiology to demonstrate the role of a particular gas in the process of photosynthesis.

Photosynthesis is the process by which green plants convert carbon dioxide and water into glucose using sunlight and chlorophyll. During this process, plants utilize carbon dioxide from the surrounding air through small openings in the leaves called stomata.

In the half-leaf experiment, a plant leaf is partially exposed to different environmental conditions to observe the effect on photosynthesis. Potassium hydroxide plays a special role because it interacts with one of the gases present in the air.

This chemical has the property of removing carbon dioxide from the surrounding Environment. When the gas is absent in a portion of the experimental setup, the plant cannot carry out photosynthesis normally in that area.

By comparing the treated and untreated parts of the leaf, scientists can demonstrate the importance of carbon dioxide in photosynthesis.

Thus, the question asks you to identify the specific role played by potassium hydroxide in this experimental setup.

Explanation: The question focuses on understanding what happens to proteins when they are digested in the human digestive system.

Proteins are complex macromolecules composed of long chains of amino Acids. Before the body can absorb and use them, these large molecules must be broken down into smaller units. This process begins in the stomach and continues in the small intestine with the help of digestive enzymes.

Different enzymes such as pepsin, trypsin, and peptidases act on proteins during Digestion. These enzymes break peptide bonds within the protein structure, gradually converting large molecules into smaller fragments.

Eventually, the Digestion process reduces proteins into their simplest absorbable units. These small molecules pass through the walls of the small intestine into the bloodstream. From there, they are transported to various tissues where they are used for growth, repair, enzyme formation, and hormone synthesis.

For example, when a person eats foods like eggs, pulses, or meat, the proteins in these foods must undergo Digestion before the body can utilize them.

The question therefore asks you to identify the simplest Molecular form in which proteins are absorbed after Digestion.

Explanation: This question relates to the biochemical reactions that occur during the Light-dependent stage of photosynthesis in plants.

Photosynthesis occurs in two major phases: the Light-dependent reactions and the Light-independent reactions. The Light-dependent phase takes place in the thylakoid membranes of chloroplasts and requires sunlight to proceed.

During this stage, Light energy is absorbed by chlorophyll molecules. This energy is used to split water molecules in a process known as photolysis. As a result, electrons are released and energy-rich molecules begin to form.

The main function of this phase is to convert light energy into chemical energy that can be used in the next stage of photosynthesis. The compounds generated during this phase act as energy carriers that fuel the subsequent reactions responsible for synthesizing carbohydrates.

Additionally, oxygen gas is released as a by-product during the splitting of water molecules.

The purpose of this question is to identify the specific energy-carrying compounds produced during the light-dependent stage that are later used in the dark phase of photosynthesis.

Explanation: This question examines a mode of Nutrition known as parasitic Nutrition.

In parasitic Nutrition, one organism depends on another living organism for Food and nutrients. The organism that obtains the nutrients is called the parasite, while the organism from which nutrients are obtained is known as the host. The parasite typically derives nourishment directly from the host’s tissues or fluids.

Unlike autotrophic Organisms that produce their own Food through photosynthesis, parasitic Organisms rely entirely on their hosts. Many parasitic plants and animals have special adaptations that allow them to attach to their host and absorb nutrients efficiently.

For example, some parasitic plants grow on other plants and draw nutrients from them using specialized structures. Because they depend on their hosts for nourishment, they may lack certain structures required for independent Food production.

This question therefore requires identifying the organism that follows this parasitic method of obtaining nutrients rather than producing its own Food or consuming Food in other ways.

Explanation: The question asks about the environmental factors that affect how fast photosynthesis occurs in plants.

Photosynthesis is a biochemical process influenced by several external factors. Important variables include light intensity, carbon dioxide concentration, and temperature. Each of these factors affects the rate at which chemical reactions involved in photosynthesis proceed.

For instance, increasing light intensity generally increases the rate of photosynthesis up to a certain limit because more energy becomes available for the reactions. Similarly, higher carbon dioxide concentrations provide more raw material for carbohydrate synthesis. Temperature also affects enzyme activity involved in the process.

However, not every environmental condition directly participates in the biochemical reactions of photosynthesis. Some factors may influence plant growth indirectly but do not directly determine the rate of photosynthetic reactions.

For example, humidity mainly affects water loss through transpiration rather than the chemical reactions occurring in the chloroplasts.

Therefore, the purpose of this question is to determine which factor among the options does not directly control the rate of photosynthesis.

Explanation: This question refers to a common preparatory step used in laboratory experiments designed to demonstrate photosynthesis in plants.

Plants produce glucose during photosynthesis, and this glucose is often stored in the leaves as starch. If a plant has been exposed to sunlight prior to the experiment, starch may already be present in its leaves due to earlier photosynthesis.

To ensure accurate experimental results, scientists first remove previously stored starch from the leaves. This is done by placing the plant in darkness for an extended period, usually about one or two days. During this time, the plant continues to respire and uses up its stored starch as an energy source.

Once the stored starch has been consumed, the leaves begin the experiment with minimal or no starch present. This allows scientists to clearly observe whether new starch is produced during the experiment under specific conditions.

Thus, the question asks you to identify the purpose of keeping the plant in darkness before performing a photosynthesis demonstration.

Explanation: The digestive system produces several secretions that help break down food into smaller molecules so they can be absorbed by the body. These secretions are released by organs such as the salivary glands, stomach, pancreas, and liver.

Most digestive fluids contain enzymes, which are biological catalysts that speed up the chemical breakdown of nutrients like carbohydrates, proteins, and fats. For example, saliva contains enzymes that start carbohydrate Digestion, while gastric juice in the stomach contains enzymes that break down proteins.

However, not every digestive secretion contains enzymes. Some digestive fluids perform supportive roles instead of directly breaking down food. These fluids may help neutralize acidity, emulsify fats, or create suitable conditions for enzymes to work efficiently.

For instance, certain digestive substances help break large fat droplets into smaller droplets so that enzymes can act on them more effectively. Although this process is important for Digestion, it does not involve enzymatic chemical reactions.

Thus, the question asks you to identify which digestive secretion assists in Digestion but does not contain enzymes responsible for chemical breakdown of food molecules.

Explanation: The question focuses on understanding how Organisms consisting of only one cell obtain nutrients required for survival.

Single-celled Organisms do not possess complex digestive systems like multicellular Organisms. Instead, all Life Processes such as feeding, Digestion, Respiration, and excretion occur within the single cell itself. Because of their simple structure, they rely on specialized cellular mechanisms to capture and process food.

Many unicellular Organisms obtain nutrients by surrounding food particles with their cell membrane. The membrane folds inward and encloses the food particle, forming a small structure inside the cell where Digestion takes place. Enzymes then break the food down into simpler substances that can be absorbed and used for energy or growth.

For example, microscopic Organisms living in water may capture tiny particles of Organic Matter or microorganisms and digest them internally.

This question therefore asks you to determine the mechanism by which single-celled Organisms obtain and process food despite lacking specialized digestive organs.

Explanation: Plants require carbon dioxide as a raw material for photosynthesis, the process by which they produce glucose using sunlight, water, and chlorophyll.

Since plants do not have lungs like animals, gases must move in and out of plant tissues through special microscopic structures present mainly on the surface of leaves. These structures allow the exchange of gases between the plant and the surrounding Atmosphere.

During photosynthesis, carbon dioxide from the air diffuses into the leaf through these tiny openings. Inside the leaf, the gas reaches cells containing chloroplasts where the chemical reactions of photosynthesis take place. At the same time, oxygen produced during photosynthesis diffuses out through the same openings.

The opening and closing of these pores are regulated by specialized cells that control gas exchange and water loss. This regulation helps the plant maintain a balance between photosynthesis and water conservation.

Thus, the question asks you to identify the specific structure in plant leaves that permits carbon dioxide to enter so that photosynthesis can occur.

Explanation: Living Organisms obtain energy and nutrients in different ways depending on their biological characteristics. Based on their mode of Nutrition, organisms are broadly classified into autotrophs and heterotrophs.

Autotrophic organisms have the unique ability to produce their own food using simple Inorganic substances. They use energy from external sources such as sunlight or chemical reactions to synthesize complex Organic molecules required for growth and survival.

In plants, this process occurs through photosynthesis, where carbon dioxide and water are converted into glucose using sunlight and chlorophyll. The glucose produced provides energy and forms the basis of food chains in ecosystems. Many microorganisms also exhibit similar nutritional strategies.

Because they generate their own food, autotrophs serve as primary producers in ecological systems. Other organisms depend on them directly or indirectly for energy and nutrients.

This question therefore requires identifying the defining characteristic of organisms classified as autotrophs based on how they obtain their food and energy.

Explanation: Energy from the Sun is the primary source of energy for most life on Earth. Certain biological processes allow organisms to capture this Solar energy and convert it into chemical energy that can be used by living cells.

In plants and some microorganisms, specialized pigments absorb light energy from the Sun. These pigments are located within organelles called chloroplasts. The absorbed energy initiates a series of biochemical reactions that convert simple substances into energy-rich molecules.

The chemical energy stored in these molecules supports plant growth and provides the energy foundation for entire food chains. Animals and other organisms depend on this stored chemical energy either directly or indirectly for survival.

For example, when herbivores eat plants, they obtain energy that originally came from sunlight and was converted into chemical energy by plant cells.

Therefore, the question asks you to identify the biological process through which organisms capture Solar energy and convert it into a usable form of chemical energy.

Explanation: Photosynthesis is a vital biological process through which green plants convert carbon dioxide and water into glucose using energy from sunlight.

During this process, chlorophyll molecules absorb light energy and use it to split water molecules in a reaction known as photolysis. This reaction produces electrons, hydrogen ions, and another substance as a by-product.

The main purpose of photosynthesis is to produce glucose, which serves as a source of energy and building material for plant growth. However, the by-product generated during the splitting of water molecules does not remain inside the plant cells.

Instead, it diffuses out of the leaf into the surrounding Atmosphere through small openings present on the leaf surface. This substance plays a crucial role in maintaining the balance of gases in the Earth’s Atmosphere and supports the survival of many Living Organisms.

The question therefore asks you to identify the substance that is released as a by-product during the process of photosynthesis.

Explanation: In biological experiments, chemical indicators are often used to detect the presence of specific substances in food or plant tissues.

An indicator is a chemical compound that changes color when it reacts with a particular substance. This property makes it useful in laboratory tests to confirm whether a certain nutrient or compound is present in a sample.

In plant experiments, leaves are sometimes tested to determine whether photosynthesis has occurred. During photosynthesis, plants produce glucose, which may be stored in the form of a complex carbohydrate within leaf tissues.

When iodine solution is applied to such tissues, it reacts with this stored compound and produces a characteristic color change. This visible reaction allows scientists to confirm the presence of the substance in plant cells.

Thus, the question asks you to identify the specific substance that can be detected using iodine solution during biological experiments.

Explanation: Photosynthesis is a complex biochemical process that occurs inside specialized structures within plant cells.

Plant cells contain various organelles, each performing specific functions required for survival. Among these organelles, one type is responsible for capturing light energy and carrying out the reactions needed to produce glucose.

These structures contain chlorophyll, the green pigment that absorbs sunlight. Inside them are membrane systems where the light-dependent reactions occur, as well as Fluid regions where the light-independent reactions take place.

Because these organelles contain the pigments and enzymes required for photosynthesis, they serve as the main site where Solar energy is converted into chemical energy in plants.

For example, leaf cells contain a large number of these organelles to maximize the plant’s ability to capture sunlight.

The question therefore asks you to identify the cellular structure responsible for carrying out the process of photosynthesis in plant cells.

Explanation: This question relates to an important scientific discovery in the study of photosynthesis.

Photosynthesis consists of two major phases. The first phase requires sunlight and produces energy-rich molecules. The second phase uses these molecules to convert carbon dioxide into Organic compounds that plants can store and use for growth.

A scientist conducted extensive research to understand the series of chemical reactions involved in this second phase. By tracing the movement of carbon atoms during photosynthesis, he discovered how carbon dioxide is gradually converted into carbohydrate molecules inside plant cells.

His work revealed the cyclic sequence of reactions that fix carbon dioxide and produce intermediate compounds before forming glucose. This discovery significantly improved the scientific understanding of how plants synthesize Organic molecules.

Because of the importance of this research in plant biochemistry, the scientist was awarded the Nobel Prize.

Thus, the question asks you to identify the stage of photosynthesis that his research helped explain.

Explanation: The color of objects we see depends on how they interact with different wavelengths of light.

Sunlight contains many colors, each corresponding to a different wavelength. When light strikes an object, some wavelengths are absorbed while others are reflected back to our eyes. The color we perceive corresponds to the wavelengths that are reflected rather than absorbed.

Plants contain chlorophyll, a pigment responsible for absorbing light energy required for photosynthesis. Chlorophyll absorbs certain wavelengths of light more efficiently than others, particularly in the red and blue regions of the visible Spectrum.

Because these wavelengths are absorbed for photosynthesis, the remaining wavelengths are reflected. When these reflected wavelengths reach our eyes, plants appear to have a characteristic green color.

This question therefore asks you to determine how plants interact with green light in order to appear green to human observers.

Explanation: The Earth’s Atmosphere is composed of several gases that together support life and regulate environmental processes. The most abundant gases are nitrogen and oxygen, while several other gases exist in much smaller proportions.

Even though some gases occur in very small quantities, they still play extremely important roles in natural processes. Carbon dioxide is one such gas. It is essential for photosynthesis because plants use it as a raw material to produce glucose and other Organic compounds.

During photosynthesis, carbon dioxide enters plant leaves through tiny pores and participates in chemical reactions that convert light energy into stored chemical energy. At the same time, animals and many microorganisms release carbon dioxide during Respiration, which helps maintain a natural balance of gases in the Atmosphere.

Although this gas is present in only a small fraction of the Atmosphere compared to nitrogen or oxygen, its importance is very high because it directly influences plant growth, global carbon cycles, and Climate systems.

The question therefore asks you to identify the approximate proportion of carbon dioxide present in the Earth’s Atmosphere.

Explanation: Photosynthesis occurs in two major stages within the chloroplasts of plant cells. The first stage, known as the light-dependent phase, captures energy from sunlight and produces energy-rich molecules required for later reactions.

The second stage is often called the dark phase or light-independent phase. This stage does not require light directly, but it uses the chemical energy produced during the earlier stage. During this phase, carbon dioxide from the Atmosphere is gradually converted into Organic compounds through a series of biochemical reactions.

These reactions occur in a cyclic pathway where carbon atoms are fixed and rearranged to form larger molecules. Intermediate compounds are formed during the process before the final product appears.

The substances produced in this stage serve as an important source of chemical energy and building material for plants. These compounds may be used immediately for metabolism or stored for later use.

Thus, the question asks you to identify the main Organic compound ultimately formed at the end of the light-independent phase of photosynthesis.

Explanation: Living Organisms perform several essential Life Processes such as Respiration, digestion, reproduction, growth, and excretion. These processes allow organisms to obtain energy, maintain body functions, and ensure survival of their species.

Animals are classified as heterotrophs because they depend on other organisms for food. They obtain energy by consuming plants or other animals and then digesting the food to release nutrients. Processes such as Respiration and digestion occur within their bodies to convert food into usable energy.

However, not all biological processes found in Living Organisms are present in animals. Some processes are characteristic of organisms that produce their own food using Inorganic substances and external energy sources such as sunlight.

For example, plants have special pigments and cellular structures that allow them to convert Solar energy into chemical energy. Animals lack these specialized components and therefore cannot perform certain energy-producing processes independently.

The question therefore asks you to determine which life process among the options cannot occur in animals because they lack the required biological structures.

Explanation: Plants generally obtain their food through photosynthesis, producing Organic compounds from carbon dioxide and water using sunlight. Such plants are known as autotrophs because they prepare their own food.

However, some plants do not produce enough food on their own and instead depend on other plants for nutrients. These plants follow a parasitic mode of Nutrition. In this relationship, the parasitic plant attaches itself to a host plant and absorbs water and nutrients from it.

Parasitic plants often develop specialized structures that penetrate the tissues of the host plant. Through these structures, they obtain the nutrients required for growth and survival. Because they depend on their host for nourishment, many of them have reduced or modified leaves and may contain little or no chlorophyll.

This type of nutritional strategy can weaken the host plant because the parasite continuously draws resources from it.

The question therefore asks you to identify the plant species among the options that obtains its Nutrition by living on another plant in a parasitic manner.

Explanation: Digestion begins in the mouth as soon as food enters the oral cavity. Mechanical digestion occurs through chewing, which breaks food into smaller pieces and increases its surface area for enzymatic action.

At the same time, chemical digestion also begins due to substances present in saliva. Saliva is secreted by salivary glands and contains water, mucus, and certain enzymes that initiate the breakdown of food components.

The primary digestive enzyme present in saliva acts on carbohydrates. It begins the process of converting complex carbohydrate molecules into simpler sugar molecules even before the food reaches the stomach.

This early stage of digestion is important because it prepares food for further breakdown in later parts of the digestive system. Once food moves into the stomach and small intestine, additional enzymes continue the digestion process.

The question therefore asks you to identify the specific enzyme present in saliva that starts the digestion of carbohydrates in the mouth.

Explanation: The digestion of fats is more complex than that of carbohydrates and proteins because fats do not dissolve easily in water-based digestive fluids.

Before enzymes can effectively act on fats, the large fat droplets present in food must first be broken into smaller droplets. This process increases the surface area of fats and allows digestive enzymes to act more efficiently.

Certain digestive fluids released into the small intestine play a critical role in this step. These fluids do not necessarily contain enzymes themselves but help prepare fats so that the enzymes responsible for fat digestion can function properly.

This preparation process is called emulsification, where large fat globules are divided into tiny droplets. Once emulsified, specialized enzymes can break down fats into smaller molecules that can be absorbed through the intestinal walls.

For example, fats from foods such as butter, oils, and dairy products undergo this process before they can be fully digested and absorbed.

The question therefore asks you to identify the digestive Fluid that assists in the breakdown of fats by preparing them for enzymatic digestion.