Read objective questions from the very important topics of ‘Plant Physiology Multiple Choice Questions‘ or ‘Crop Physiology Multiple Choice Questions‘. Questions are based on ICAR syllabus.


  • JRF Questions.
  • SRF Questions.
  • Agricultural National Eligiblity Test (NET).
  • State Agricultural University Common Entrance Test (SAU CET).
  • All Others Agricultural Competition Exams.
  • State PSC.
  • UPSC.

Multiple Choice Questions On Plant Physiology (MCQ)

Questions 01 – 20: Multiple Choice Objective Questions….

Answer Key Link(s) After Each 5th MCQ

Question 01. Who termed ‘phytohormone‘?

(a). Went.
(b). Thimann.
(c). Both a and b.
(d). Eiichi Kurosawa.

Question 02. The plant growth regulator which plays major in closing the stomata..?

(a). Cytokinin.
(b). Abscisic acid.
(c). Gibberellin.
(d). Auxins.

Question 03. The auxins, in conjunction with …., control the growth of stems, roots, and fruits, and convert stems into flowers?

(a). Gibberellin.
(b). Ethylene.
(c). Abscisic acid.
(d). Cytokinin.

Question 04. Which is the only steroid based hormone in plants?

(a). Cytokinin.
(b). Jasmonates.
(c). Brassinosteroides.
(d). Salicylic.

Question 05. In grafting, …. promotes callus tissue formation, which joins the surface of the graft together?

(a). Auxin.
(b). Gibberellic.
(c). Naphthalene acetic acid.
(d). Cytokinin.

See answer

Question 06. In the light dependent reactions, one molecule of the pigment chlorophyll absorbs ….  photon and loses …. electron?

(a). 1, 1.
(b). 1, 2.
(c). 2, 1.
(d). 2, 2.

Question 07. The another name for light independent reaction is..?

(a). Kreb cycle.
(b).ATP cycle.
(c). NADPH cycle.
(d). Calvin cycle.

Question 08. Which is the precursor of calvin cycle?

(a). NADPH.
(b). RuBisCO.
(c). ATP.
(d). CO2.

Question 09. The cyclic reaction is similar to that of non-cyclic but differs in that it generates only..?

(a). ATP.
(b). Reduced NADP.
(c). Both a and b.
(d). None of the above.

Question 10. Which is an example of C4 plant?

(a). Maize.
(b). Sugar cane.
(c). Sorghum.
(d). All of the above.

See answer

Question 11. Which plant physiological disorder is not caused by the deficiency of any micronutrient?

(a). Blast of rice.
(b). Rust of maize.
(c). Powdery mildew of wheat.
(d). None of the above.

Question 12. …. is the physiological disease of …. which is a result of the deficiency of molybdenum?

(a). Buttoning, cabbage.
(b). Blindness, cauliflower.
(c). Whip tail, cauliflower.
(d). Browning, cabbage.

Question 13. How would you correct calyx splitting in carnation..?

(a). Use of borax.
(b). By using potassium.
(c). Nitrogen.
(d). Management of day light.

Question 14. Khaira is a well known physiological disorder of..?

(a). Maize.
(b). Rice.
(c). Wheat.
(d). Millet.

Question 15. Spongy tissue is serious problem in..?

(a). Apple.
(b). Beal.
(c). Mango.
(d). Coconut.

See answer

Question 16. Which is not a type of stomata?

(a). Anomocytic stomata.
(b). Diacytic stomata.
(c). Paracytic stomata.
(d). Hydraulic stomata.

Question 17. Which is a type of monocot stomata?

(a). Gramineous stomata.
(b). Tetracytic stomata.
(c). Hexacytic stomata.
(d). All of the above.

Question 18. Chloroplasts carry out other function(s) too apart from photosynthesis..?

(a). Fatty acid synthesis.
(b). Amino acid synthesis.
(c). Immune response in plants.
(d). All of the above.

Question 19. The chloroplast envelope includes..?

(a). Outer membrane.
(b). Inter membrane space.
(c). Inner membrane.
(d). All of the above.

Question 20. Chlorophyll absorbs mainly the..?

(a). Blue and red wavelengths.
(b). Red and yellow wavelengths.
(c). Blue and green wavelengths.
(d). Orange and purple wavelengths.

See answer

Questions 21 – 25: Match the followings and select right answer….

Question 21. Substrates and enzyme in kreb cycle….

a. Citrate.
b. Succinate + ubiquinone.
c. Oxalosuccinate.
d. Oxaloacetate + Acetyl CoA + H2O.

  1. Isocitrate dehydrogenase.
  2. Citrate synthase.
  3. Aconitase.
  4. Succinate dehydrogenase.

(a). a_ 3. b_ 4. c_ 1. d_ 2.
(b). a_ 4. b_ 3. c_ 1. d_ 2.
(c). a_ 3. b_ 1. c_ 4. d_ 2.
(d). a_ 1. b_ 4. c_ 3. d_ 2.

Question 22. Scientist and their discovery..

a. Kreb cycle.
b. Photosynthesis.
c. Plant cell.
d. Chlorophyll.

  1. B. C. Caventou.
  2. Robert Hooke.
  3. Jan Ingenhousz.
  4. Hans Adolf.

(a). a_ 1. b_ 3. c_ 2. d_ 4.
(b). a_ 2. b_ 3. c_ 4. d_ 1.
(c). a_ 4. b_ 3. c_ 2. d_ 1.
(d). a_ 3. b_ 4. c_ 2. d_ 1.

Question 23. Vegetable crops and physiological disorders..?

a. Potato.
b. Cauliflower.
c. Tomato.
d. Green house pepper fruits.

  1. Fruit crack.
  2. Hallow heart.
  3. Buttoning.
  4. Poor fruit set.

(a). a_ 3. b_ 2. c_ 1. d_ 4.
(b). a_ 2. b_ 3. c_ 4. d_ 1.
(c). a_ 1. b_ 3. c_ 4. d_ 2.
(d). a_ 4. b_ 3. c_ 2. d_ 1.

Question 24. Plant growth regulators and their role in plants….

a. Abscisic acid.
b. Auxin.
c. Cytokinin.
d. Ethylene.

  1. Cell elongation.
  2. Plant growth inhibitors.
  3. Fruit ripening.
  4. Apical dominance.

(a). a_ 2. b_ 4. c_ 1. d_ 3.
(b). a_ 1. b_ 4. c_ 2. d_ 3.
(c). a_ 3. b_ 4. c_ 1. d_ 2.
(d). a_ 1. b_ 3. c_ 2. d_ 4.

Question 25. Phytochemicals and plant/flower source….

a. Alkaloids.
c. Polyphenols.
d. Glycosides.

  1. Senna alexandrina.
  2. Angelica.
  3. Thymus vulgaris.
  4. Papaver somniferum.

(a). a_ 3. b_ 4. c_ 2. d_ 1.
(b). a_ 2. b_ 3. c_ 4. d_ 1.
(c). a_ 4. b_ 3. c_ 2. d_ 1.
(d). a_ 1. b_ 2. c_ 3. d_ 4.

See answer

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