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
Consider the following statements: Assertion (A): Cuscuta (Amarbel) is an example of a parasitic angiosperm. Reason (R): It gets its nutrition from the host plant. Choose your answer from the codes given below
(a) Both (A) and (R) are true and (R) is the correct explanation of (A)
(b) Both (A) and (R) are true but (R) is not the correct explanation of (A)
(c) (A) is false, but (R) is true
(d) (A) is true, but (R) is false
Option a – Both (A) and (R) are true and (R) is the correct explanation of (A)
When touched, the leaflets of the Touch-me-not plant are closed. Closing of leaflets starts from the point of contact to the leaflets away. The leaflets are closed due to :
(a) change in turgor pressure
(b) specialized proteins
(c) growth hormone retardation
(d) capillary action
Option a – change in turgor pressure
What is the main reason for the increase in temperature in a glass house :
(a) Sunlight is completely absorbed by plants in the glass house
(b) Radiation fails to escape from the glass house completely
(c) Plants do not utilize sunlight in a glass house
(d) Plants produce heat inside the glass house
Option b – Radiation fails to escape from the glass house completely
Consider the following statements: 1. Lateral outgrowth of leaf base is called stipule. 2. Leaves with stipules are called exstipulate leaves. 3. Leaves without stipules are called stipulate leaves. Which of the statements given above is/are correct?
(a) 1, 2 and 3
(b) 1 only
(c) 2 and 3
(d) 1 and 3
Option b – 1 only
From the following statements A. Carbon dioxide taken in through stomata is used in photosynthesis. B. Oxygen taken in through stomata is used in respiration. C. Water vapor taken in through stomata is used in transpiration. Select the correct alternative.
(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 pot herb, vaseline/vegetable oil was applied on the upper surface of one leaf (Experimental leaf 1) and on the lower surface of another leaf (Experimental leaf 2). Vaseline/Vegetable oil was not applied to the control leaf. The plant was deliberately not watered for several days. Which leaf will dry up last?
(a) Experimental leaf 1
(b) Experimental leaf 2
(c) Control leaf
(d) All the leaves will dry up simultaneously
Option d – All the leaves will dry up simultaneously
Which plant hormone promotes dormancy in seeds and buds?
(a) Auxin
(b) Gibberellin
(c) Cytokinin
(d) Abscisic acid
Option d – Abscisic acid
Consider the following statements: Annual rings are distinct in plants that grow in temperate regions. 2. One growing ring of the plant consists of only spring wood. Which of the statements given above is/are correct about the annual ring?
(a) 1 only
(b) 2 only
(c) 1 and 2
(d) Neither 1 nor 2
Option a – 1 only
Consider the following statements: 1. Food prepared by the plant is transported to different parts of the plant through phloem. Water and minerals in the plant are transported through the phloem. 3. The cell wall of phloem cells is rich in lignin. Which of the statements given above is/are correct?
(a) 1 only
(b) 2 and 3
(c) 1 and 3
(d) 1, 2 and 3
Option a – 1 only
Consider the following statements: 1. Carbon dioxide, chlorophyll, and sunlight all are essential for photosynthesis. 2. Rate of photosynthesis is minimum in red light and maximum in green light. 3. Increase in O, concentration decreases photosynthesis. Which of the statements given above is correct about photosynthesis?
(a) 1 and 2
(b) 2 and 3
(c) 1 and 3
(d) 1, 2 and 3
Option c – 1 and 3
Choose the forms in which 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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