Srijan ICSE Biology Class 7 Solutions

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Srijan ICSE Biology Class 7 Solutions. We covered all the Srijan ICSE Biology Class 7 Solutions chapter 1 to 7 pdf file provided in this post for free so that you can practice well for the exam.

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Srijan ICSE Biology Class 7 Objective with Solutions for Students

To study meiosis in plants, the best part would be:

(a) Shoot apex

(b) Root apex

(c) Anthers

(d) Leaf cells

Option c – Anthers

A plant hormone used for inducing morphogenesis in plant tissue culture is:

(a) Ethylene

(b) Gibberellin

(c) Cytokinin

(d) Abscisic acid

Option c – Cytokinin

Cell elongation in internodal regions of green plants takes place due to:

(a) Indole acetic acid

(b) Cytokinins

(c) Gibberellins

(d) Ethylene

Option c – Gibberellins

Plasticity in plant growth means that:

(a) Plant roots are extensible.

(b) Plant development is dependent on the environment.

(c) Stems can extend.

(d) None of the above

Option b – Plant development is dependent on the environment

The effect of photoperiod on the growth and development of plants, especially on flowering, is called:

(a) Vernalisation

(b) Photoperiodism

(c) Phototaxis

(d) Both (a) and (b)

Option b – Photoperiodism

The photoperiod in plants is perceived as:

(a) Meristem

(b) Flower

(c) Floral buds

(d) Leaves

Option d – Leaves

Which of the following is an example of a long-day plant?

(a) Tomato

(b) Maize

(c) Rice

(d) Radish

Option d – Radish

The flowering of plants by exposure to low temperatures is called:

(a) Vernalisation

(b) Cryobiology

(c) Photoperiodism

(d) Micrografting

Option a – Vernalisation

The temperature required for vernalization is:

(a) 5-10°C

(b) 5-15°C

(c) 0-5°C

(d) 3-17°C

Option c – 0-5°C

Examples of plants that require vernalization are:

(a) Pea

(b) Sugar beet

(c) Cabbage

(d) All of these

Option d – All of these

Vernalisation can be reversed by:

(a) Application of high temperature.

(b) Application of auxin.

(c) Application of more or less temperature.

(d) Application of gibberellin.

Option a – Application of high temperature

Which one among the following produces seeds but not flowers?

(a) Cashewnut

(b) Coffee

(c) Groundnut

(d) Pine

Option d – Pine

In females, a small portion of the oviduct is removed, and the cut end is ligated by surgical operation. This procedure is called:

(a) Vasectomy

(b) Tubectomy

(c) Neurotomy

(d) None of the above

Option b – Tubectomy

In the artificial insemination process, which of the following is/are introduced into the uterus of the female?

(a) Egg only

(b) Fertilized egg

(c) Sperm only

(d) Egg and sperm

Option c – Sperm only

In the human body, Cowper’s glands form a part of which one of the following?

(a) Digestive system

(b) Endocrine system

(c) Reproductive system

(d) Nervous system

Option c – Reproductive system

In the test tube baby:

(a) Fertilization of ova and development takes place in the test tube.

(b) Fertilization of ova takes place in the test tube while the development of the embryo occurs in the uterus.

(c) Fertilization takes place in the uterus while development takes place in the test tube.

(d) Development of ova takes place in the test tube without fertilization.

Option b – Fertilization of ova takes place in the test tube while the development of the embryo occurs in the uterus

Sertoli cells are present in:

(a) Male reproductive system.

(b) Female reproductive system.

(c) Both (a) and (b)

(d) None of the above

Option a – Male reproductive system

Which of the following roles is/are played by epididymis, vas deferens, seminal vesicles, and prostate in the male reproductive system of humans?

(a) Spermatogenesis and maturation of sperms

(b) Maturation and motility of sperms

(c) Spermatogenesis and motility of sperms

(d) Motility of sperms only

Option b – Maturation and motility of sperms

Corpus luteum is a mass of cells found in:

(a) Brain

(b) Ovary

(c) Pancreas

(d) Spleen

Option b – Ovary

Which one of the following is not an essential micronutrient for plants?

(a) Boron

(b) Potassium

(c) Sodium

(d) Magnesium

Option c – Sodium

Which of the following elements is not a micronutrient for plants?

(a) Iron

(b) Manganese

(c) Copper

(d) Magnesium

Option d – Magnesium

Which of the following plants is carnivorous?

(a) Cypress vine

(b) Venus Flytrap

(c) Amaryllis

(d) Hyacinth

Option b – Venus Flytrap

Identify the parasite in the following.

(a) Pitcher plant

(b) Cuscuta

(c) Bladderwort

(d) Sunflower

Option b – Cuscuta

In biological terms, …….. is a relationship between two organisms in which one organism benefits and the other is unaffected.

(a) Amensalism

(b) Mutualism

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(c) Commensalism

(d) Parasitism

Option c – Commensalism

Which one of the following is an insectivorous plant?

(a) Utricularia

(b) Sequoia Gigantia

(c) Nostoc

(d) Bryophyta

Option a – Utricularia

‘Crop logging’ is a method of:

(a) Soil fertility evaluation.

(b) Plant analysis for assessing the requirements of nutrients for crop production.

(c) Assessing crop damage.

(d) Testing the suitability of fertilizers.

Option b – Plant analysis for assessing the requirements of nutrients for crop production

Which of the following elements is not essential for plant growth?

(a) Sodium

(b) Potassium

(c) Calcium

(d) Magnesium

Option a – Sodium

Which micronutrient is supplied by the soil to the plant?

(a) Phosphorus

(b) Calcium

(c) Zinc

(d) Nitrogen

Option c – Zinc

The net movement of water from a dilute to a concentrated solution through a selectively permeable membrane is called:

(a) Diffusion

(b) Dispersion

(c) Osmosis

(d) Absorption

Option c – Osmosis

An element present in Chlorophyll is:

(a) Ca

(b) Fe

(c) Mg

(d) S

Option c – Mg

The macro-nutrients provided by inorganic fertilizers are:

(a) Carbon, iron, and boron.

(b) Magnesium, manganese, and sulfur.

(c) Magnesium, zinc, and iron.

(d) Nitrogen, phosphorus, and potassium.

Option d – Nitrogen, phosphorus, and potassium

In root nodules of legumes, leghemoglobin is important because:

(a) It transports oxygen to the root nodule.

(b) It acts as an oxygen scavenger.

(c) It provides energy to the nitrogen-fixing bacterium.

(d) It acts as a catalyst in transamination.

Option b – It acts as an oxygen scavenger

Which one among the following is a micronutrient present in soil for various crops?

(a) Calcium

(b) Manganese

(c) Magnesium

(d) Potassium

Option b – Manganese

If cells are kept in some solution and the net result is that the cell swells up, then the solution is:

(a) Hypertonic

(b) Isotonic

(c) Hypotonic

(d) Acidic

Option c – Hypotonic

The maximum amount of water, that plants need to grow, is absorbed by the following:

(a) Embryonic zone

(b) Growing point

(c) Zone of elongation

(d) Root hairs

Option d – Root hairs

Osmosis is defined as:

(a) Diffusion of solvent (water) through a semipermeable membrane from a less concentrated solution to a more concentrated solution.

(b) Flow of solute from a semipermeable membrane.

(c) Flow of water without a membrane.

(d) Diffusion of suspended particles from higher to lower concentration.

Option a – Diffusion of solvent (water) through a semipermeable membrane from a less concentrated solution to a more concentrated solution

Which one of the following statements about the transport mechanism in plants is correct?

(a) Diffusion of ions and small molecules across the cell membrane requires energy.

(b) Active transport of ions and small molecules across the cell membrane against concentration gradient requires energy.

(c) Cells conserve energy, and no energy is required for the transport of ions and small molecules against the concentration gradient.

(d) Cells do not transport ions across their membrane as these are charged molecules.

Option b – Active transport of ions and small molecules across the cell membrane against concentration gradient requires energy

Which one of the following will happen if the medium surrounding the cell has a higher concentration than the cell?

(a) The cell will gain water.

(b) The cell will die.

(c) There will be no change.

(d) The cell will lose water.

Option d – The cell will lose water

The movement of water molecules through the plasma membrane is called:

(a) Osmosis

(b) Sedimentation

(c) Precipitation

(d) Transpiration

Option a – Osmosis

The first step of photosynthesis is:

(a) Activation of chlorophyll by sunlight.

(b) Oxygen comes out from water.

(c) Formation of carbohydrates.

(d) Fixation of carbon dioxide.

Option a – Activation of chlorophyll by sunlight

Which one of the following is active transport?

(a) It is the movement of a substance against a diffusion gradient with the use of energy from respiration.

(b) It is the movement of a substance against a diffusion gradient without the use of energy.

(c) It is the movement of a substance against a diffusion gradient with the use of energy from photosynthesis.

(d) It is the movement of a substance along a diffusion gradient with the use of energy from respiration.

Option a – It is the movement of a substance against a diffusion gradient with the use of energy from respiration

Gaseous exchange takes place in leaves through tiny pores for the purpose of photosynthesis. What are these pores?

(a) Chloroplast

(b) Stomata

(c) Chlorophyll

(d) Vacuole

Option b – Stomata

What is the shape of the two guard cells which enclose stomata?

(a) Oval

(b) Triangular

(c) Rectangular

(d) Kidney-shaped

Option d – Kidney-shaped

In which one of the following physiological processes, does excess water escape in the form of droplets from a plant?

(a) Transpiration

(b) Guttation

(c) Secretion

(d) Excretion

Option b – Guttation

The ultimate cause of water movement in a plant stem against gravity is:

(a) Osmosis

(b) Transpiration

(c) Photosynthesis

(d) Diffusion

Option b – Transpiration

The process by which plants prepare their food is:

(a) Carbohydrolysis

(b) Metabolic synthesis

(c) Photosynthesis

(d) Photorespiration

Option c – Photosynthesis

The role of chlorophyll in photosynthesis is:

(a) Absorption of water

(b) Absorption of light energy

(c) Absorption of CO₂

(d) None of the above

Option b – Absorption of light energy

The first compound that is fixed during photosynthesis is:

(a) Phosphoglyceric acid

(b) Starch

(c) Glucose

(d) Diphosphoglyceric acid

Option a – Phosphoglyceric acid

Flower colors of red, pink, blue, and purple come mainly from the pigments called:

(a) Carotenoids

(b) Lycopene

(c) Chlorophyll

(d) Anthocyanins

Option d – Anthocyanins

Solar energy is converted into ATP in:

(a) Mitochondria

(b) Chloroplast

(c) Ribosome

(d) Peroxisome

Option b – Chloroplast

Which one of the following gases comes out during photosynthesis?

(a) Oxygen

(b) Carbon dioxide

(c) Hydrogen

(d) Chlorine

Option a – Oxygen

The evolved oxygen during photosynthesis comes from the splitting of:

(a) Water

(b) Carbon dioxide

(c) Oxygen

(d) Light

Option a – Water

Which of the following organelles of a cell is/are involved in photosynthesis?

(a) Chloroplast

(b) Mitochondrion

(c) Endoplasmic reticulum

(d) Golgi bodies

Option a – Chloroplast

The by-product of photosynthesis is:

(a) CO2

(b) O₂

(c) Energy

(d) Sugar

Option b – O₂

Which one of the following gases is essential for photosynthesis?

(a) CO

(b) CO₂

(c) N₂

(d) O₂

Option b – CO₂

Most of the photosynthesis process occurs in: ( Srijan ICSE biology class 7 solutions )

(a) Blue and red region of light.

(b) Green and yellow region of light.

(c) Blue and orange region of light.

(d) Violet and orange region of light.

Option a – Blue and red region of light

When the chloroplast pigments absorb light:

(a) They become reduced.

(b) They lose potential excitement.

(c) Their electrons become excited.

(d) The Calvin cycle is triggered.

Option c – Their electrons become excited

Photosystem (PS-I) and Photosystem-II (PS-II) are named:

(a) In the sequence they work in light reaction.

(b) According to their molecular weight.

(c) In the sequence of their discovery.

(d) In the sequence of their constituents.

Option c – In the sequence of their discovery

During the light reaction of photosynthesis: ( Srijan ICSE biology class 7 solutions )

(a) ADP is phosphorylated and NADPH oxidized.

(b) ADP is phosphorylated and NADP reduced.

(c) ADP is phosphorylated and NADPH reduced.

(d) ATP is phosphorylated and NADPH reduced.

Option b – ADP is phosphorylated and NADP reduced

The sunlight energy used by green plants in photosynthesis is transformed into:

(a) Chemical energy

(b) Physical energy

(c) Both (a) and (b)

(d) None of the above

Option a – Chemical energy

Which of these is the energy conversion that happens in the process called photosynthesis?

(a) Potential energy to chemical energy.

(b) Light energy to chemical energy.

(c) Heat energy to light energy.

(d) Heat energy to light energy.

Option b – Light energy to chemical energy

Water-soluble pigments found in plant cell vacuoles are:

(a) Chlorophylls

(b) Carotenoids

(c) Anthocyanins

(d) Xanthophylls

Option c – Anthocyanins

Why are dark reactions called so?

(a) They occur in darkness.

(b) They are not light-dependent.

(c) They are not directly light-driven.

(d) Both (a) and (b)

Option c – They are not directly light-driven

Which of the following is an accessory pigment?

(a) Chlorophyll-a

(b) Chlorophyll-c

(c) Grana

(d) Hemozoin

Option b – Chlorophyll-c

The main photosynthetic pigments in plants are:

(a) Chlorophyll-a and chlorophyll-c

(b) Chlorophyll-a and chlorophyll-d

(c) Chlorophyll-b and chlorophyll-a

(d) Chlorophyll-b and chlorophyll-c

Option c – Chlorophyll-b and chlorophyll-a

CAM helps the plants in: ( Srijan ICSE biology class 7 solutions )

(a) Secondary growth

(b) Disease resistance

(c) Reproduction

(d) Conserving water

Option d – Conserving water

Which one of the following statements is correct?

(a) In photosynthesis by green plants, carbon dioxide is used for making carbohydrates.

(b) During photosynthesis, plants use oxygen to make carbohydrates.

(c) The carbohydrate generated by plants comes from the soil.

(d) The carbohydrate generated by plants comes from urea.

Option a – In photosynthesis by green plants, carbon dioxide is used for making carbohydrates

During respiration, energy is produced in the form of:

(a) ADP

(b) ATP

(c) NADP

(d) CO₂

Option b – ATP

The biosynthetic phase is called a dark reaction because:

(a) It depends on the light reaction.

(b) It does not depend on the light.

(c) It does not depend on NADPH.

(d) It does not depend on ATP.

Option b – It does not depend on the light

The steps of dark reactions are: ( Srijan ICSE biology class 7 solutions )

(a) Regeneration carboxylation → reduction

(b) Reduction → oxidation → hydrogenation

(c) Carboxylation → reduction → regeneration

(d) Reduction → carboxylation → regeneration

Option c – Carboxylation → reduction → regeneration

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