Plant Physiology Questions and Answers MCQ for NEET Exams

Plant physiology is the study of how plants function and grow. It involves understanding the biochemical and biophysical processes that occur within plants, including photosynthesis, respiration, transpiration, and nutrient uptake. Plant physiologists study how plants respond to environmental stimuli such as light, temperature, water availability, and nutrients, as well as how plants develop and reproduce.

Understanding plant physiology is important for developing strategies to improve crop yields, enhance plant growth and health, and mitigate the effects of environmental stressors such as drought, heat, and pests.

Plant Physiology Objective Questions MCQ


1. Which among the following is a male part of a flower? [SSC 2020]
(A) Stigma
(B) Stamen
(C) Style
(D) Pistil

2. In which part of the female flower, fertilisation take place? [SSC CGL 2019]
(A) Ovary
(B) Stigma
(C) Filament
(D) Style

3. Which of the following plants is carnivorous? [SSC CGL 2019]
(A) Cypress vine
(B) Venus Flytrap
(C) Amaryllis
(D) Hyacinth

4. Which one of the following is not an essential micronutrient for plants? [SSC 2018]
(A) Boron
(B) Potassium
(C) Sodium
(D) Magnesium

5. An element present in Chlorophyll is [BPSC 2004]
(A) Ca
(B) Fe
(C) Mg
(D) S

6. The ultimate cause of water movement in a plant stem against gravity is [CDS 2012]
(A) osmosis
(B) transpiration
(C) photosynthesis
(D) diffusion

7. First step of photosynthesis is
(A) activation of chlorophyll by sunlight.
(B) oxygen comes out from water.
(C) formation of carbohydrate.
(D) fixation of carbon dioxide.

8. The oxygen evolved during photosynthesis comes from splitting of [NDA/NA 2018]
(A) water
(B) carbon dioxide
(C) oxygen
(D) light

9. The by-product of photosynthesis is [BPSC (Pre) 2019]
(A) CO2
(B) O,
(C) energy
(D) sugar

10. First compound which is fixed during photosynthesis is [RRB 2003]
(A) phosphoglyceric acid
(B) starch
(C) glucose
(D) diphosphoglyceric acid

11. Which one of the following will happen if the medium surrounding the cell has a higher concentration than the cell? [Astt. Comm. 2019]
(A) The cell will gain water.
(B) The cell will die.
(C) There will be no change.
(D) The cell will lose water.

12. If cells are kept in some solution and the net result is that the cell swells up, then the solution is ........ [SSC2017]
(A) hypertonic
(B) isotonic
(C) hypotonic
(D) acidic

13. Gaseous exchange takes place in leaves through tiny pores for the purpose of photosynthesis. What are these pores? [SSC (10+2) 2018]
(A) Chloroplast
(B) Stomata
(C) Chlorophyll
(D) Vacuole

14. What is the ultimate product of Glycolysis? [SSC 2017]
(A) Ethyl alcohol
(B) Carbon dioxide
(C) Pyruvic acid
(D) Glucose

15. Which of the following processes makes direct use of oxygen? [IAS (Pre) 2017]
(A) Glycolysis
(B) Fermentation
(C) Citic Acid Cycle
(D) Electron transport

16. Which of the following full form of ATP is correct? [SSC 2017]
(A) Adenosine Tetraphosphate
(B) Adenine Tetraphosphate
(C) Adenosine Triphosphate
(D) None of the above

17. Which one of the following is a plant hormone? [UPPSC (Mains) 2011]
(A) Insulin
(B) Thyroxine
(C) Estrogen
(D) Cytokinin

18. Which one among the following hormones stimulates the plant cells to grow in a manner such that the plant is to be bent towards light? [NDA 2013]
(A) Cytokinin
(B) Auxin
(C) Gibberellin
(D) Abscisic

19. The gas used for artificial ripening of green fruit is [JPSC (Pre) 2010]
(A) Ethane
(B) Acetylene
(C) Carbon-dioxide
(D) Oxytocin

20. The hormone related to drought tolerance is [UP Lower Sub (Pre) 2013]
(A) Abscisic acid
(B) Gibberellin
(C) Indole acetic acid
(D) Cytokinin

21. Any one parameter is not good enough to demonstrate growth through the life of a flowering plant because [UPPSC (Mains) 2016]
(A) lateral meristems appear later in life.
(B) apical meristems contribute to elongation while lateral meristems increase girth.
(C) increase in protoplasm is difficult to measure directly.
(D) None of the above

22. Fruits stored in a cold chamber exhibit longer storage life because [IAS (Pre) 2013]
(A) exposure to sunlight is prevented.
(B) concentration of carbon dioxide in the environment is increased.
(C) rate of respiration is decreased.
(D) there is an increase in humidity.

23. Which of the following is correct sequence of the events occurring during sexual reproduction in plants? [CDS 2020]
(A) Seedling, Embryo formation, Pollination, Fertilisation, Division of zygote
(B) Embryo formation, Seedling, Pollination, Fertilisation, Division of zygote
(C) Pollination, Fertilisation, Division of zygote, Embryo formation, Seedling
(D) Seedling, Embryo formation, Division of zygote, Pollination, Fertilisation

24. Which one of the following statements about transport mechanism in plants is correct? [IAS 2018]
(A) Diffusion of ions and small molecules across cell membrane requires energy.
(B) Active transport of ions and small molecules across cell membrane against concentration gradient requires energy.
(C) Cells conserve energy and no energy is required for transport of ions and small molecules against concentration gradient.
(D) Cells do not transport ions across their membrane as these are charged molecules.

25. Which one of the following statements is correct? [IAS (Pre) 2018]
(A) In photosynthesis by green plants, carbon dioxide is used for making carbohydrate.
(B) During photosynthesis, plants use oxygen for making carbohydrate.
(C) The carbohydrate generated by plants comes from soil.
(D) The carbohydrate generated by plants comes from urea.