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mcq of Plant Physiology. We covered all the mcq of Plant Physiology in this post for free so that you can practice well for the exam.
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mcq on Plant Physiology for Students
Assertion: Cuscuta (Amarbel) is categorized as a parasitic angiosperm. Reason: It derives its nutrients from the host plant. Which of the following is correct?
a) Both the assertion and reason are true, and the reason explains the assertion correctly
b) Both the assertion and reason are true, but the reason does not explain the assertion
c) The assertion is incorrect, but the reason is correct
d) The assertion is correct, but the reason is incorrect
Option a – Both the assertion and reason are true, and the reason explains the assertion correctly
When touched, the leaflets of the Touch-me-not plant fold inward. This movement starts from the contact point and spreads outward. The cause of this response is:
a) Changes in turgor pressure
b) Activity of special proteins
c) Inhibition of growth hormones
d) Capillary action
Option a – Changes in turgor pressure
What primarily causes the temperature to rise inside a greenhouse?
a) Sunlight is completely absorbed by the plants
b) Heat radiation is trapped and cannot fully escape
c) Plants fail to utilize sunlight inside the greenhouse
d) Heat is generated by plants in the greenhouse
Option b – Heat radiation is trapped and cannot fully escape
Consider the following statements: 1. The lateral outgrowth at the Base of a leaf is called a stipule. 2. Leaves having stipules are termed exstipulate. 3. Leaves without stipules are called stipulate. Which statement(s) is/are correct?
a) 1, 2 and 3
b) Only 1
c) 2 and 3
d) 1 and 3
Option b – Only 1
Examine the following statements: A. Carbon dioxide taken in via stomata is used in photosynthesis. B. Oxygen absorbed through stomata is used in Respiration. C. Water vapor entering through stomata is utilized in transpiration. Which of the options below is correct?
a) A and B
b) A and C
c) B and C
d) A, B and C
Option a – A and B
In a dicot herb, vaseline or vegetable oil was applied on the upper surface of one leaf (Leaf 1) and on the lower surface of another leaf (Leaf 2). A third leaf was left untreated. The plant was not watered for a few days. Which leaf is expected to retain moisture the longest?
a) Leaf 1
b) Leaf 2
c) Untreated leaf
d) All leaves will lose moisture at the same rate
Option d – All leaves will lose moisture at the same rate
Which plant hormone is responsible for inducing dormancy in seeds and buds?
a) Auxin
b) Gibberellin
c) Cytokinin
d) Abscisic Acid
Option d – Abscisic Acid
Consider the following statements regarding annual rings: 1. Clear annual rings are found in plants that grow in temperate zones. 2. A single annual ring is composed only of spring wood. Which of these is/are correct?
a) Only 1
b) Only 2
c) Both 1 and 2
d) Neither 1 nor 2
Option a – Only 1
Examine the following statements: 1. The Food made by plants is distributed through the phloem. 2. Water and Minerals are also transported by the phloem. 3. Phloem cells have lignin-rich cell walls. Which statement(s) is/are correct?
a) Only 1
b) 2 and 3
c) 1 and 3
d) 1, 2 and 3
Option a – Only 1
Consider the following points regarding photosynthesis: 1. Chlorophyll, carbon dioxide, and sunlight are necessary for photosynthesis. 2. The rate of photosynthesis is lowest under red Light and highest under green Light. 3. An increase in oxygen concentration can reduce the rate of photosynthesis. Which of the statements are accurate?
a) 1 and 2
b) 2 and 3
c) 1 and 3
d) 1, 2 and 3
Option c – 1 and 3
In which forms do most plants absorb nitrogen? (i) Proteins (ii) Nitrates and nitrites (iii) Urea (iv) Atmospheric nitrogen
a) (i) and (ii)
b) (ii) and (iii)
c) (iii) and (iv)
d) (i) and (iv)
Option b – (ii) and (iii)
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