Biology Class 11th Chapter 13 mcqs

1. The rate of photosynthesis is controlled by

(a) the rate of light reaction

(b) the rate of dark reaction

(c) the rates of both light and dark reactions

(d) none of the above

Answer: (b) the rate of dark reaction

2. The end product of the Calvin cycle is ______.

(a) RuBP

(b) PGAL

(c) PGA

(d) ADP + NADP

Answer: (a) RuBP

3. The primary carbon dioxide acceptor in C4 cycle is

(a) malic acid

(b) phosphoenol pyruvate

(c) rubisco

(d) aspartic acid

Answer: (b) phosphoenol pyruvate

4. The law of limiting factor was given by

(a) Calvin

(b) Blackman

(c) Priestley

(d) None of these

Answer: (b) Blackman

5. The metabolic pathway which produces carbohydrate is

(a) Calvin cycle

(b) Glycolysis

(c) Cyclic electron pathway

(d) Krebs cycle

Answer: (a) Calvin cycle

6. Manganese is required in

(a) Chlorophyll synthesis

(b) Nucleic acid synthesis

(c) Plant cell wall formation

(d) Photolysis of water during photosynthesis

Answer: (d) Photolysis of water during photosynthesis

7. Oxidative phosphorylation refers to

(a) Anaerobic production of ATP

(b) The citric acid cycle production of ATP

(c) Production of ATP by chemiosmosis

(d) Alcoholic fermentation

Answer: (c) Production of ATP by chemiosmosis

8. Which of the following is not an accessory pigment?

(a) Carotene

(b) Chlorophyll a

(c) Chlorophyll b

(d) Xanthophyll

Answer: (b) Chlorophyll a

9. Besides water and CO₂, which is more essential a raw material for food formation

(a) light

(b) oxygen

(c) NAD

(d) mineral salt

Answer: (a) light

10. In actively gro – wing young plants, the best data for estimating the rate of photosynthesis would be

(a) ratio of oxygen evolved to carbon dioxide absorbed

(b) increase in fresh weight

(c) increase in dry weight

(d) increase in carbohydrate

Answer: (a) ratio of oxygen evolved to carbon dioxide absorbed

11. Discovery of Emerson effect has already shown the

(a) two distinct photochemical reactions

(b) light and dark reactions of photosynthesis

(c) photophosphorylation

(d) photorespiration

Answer: (a) two distinct photochemical reactions

12. Translocation of sugar in flowering plants occurs in the form of

(a) glucose

(b) sucrose

(c) starch

(d) maltose

Answer: (b) sucrose

13. Where are thylakoids and grana located?

(a) Lysosomes

(b) Mitochondria

(c) Chloroplasts

(d) Golgi apparatus

Answer: (c) Chloroplasts

14. Who enunciated the law of limiting factor for photosynthesis?

(a) Robert Emerson

(b) Ruben

(c) Blackman

(d) Calvin

Answer: (c) Blackman

15. Which one of the following statement is true for ATP?

(a) ATP is prosthetic part of an enzyme

(b) ATP is an enzyme

(c) ATP is organic ions of enzyme

(d) ATP is a Co-enzyme

Answer: (d) ATP is a Co-enzyme

16. Kranz anatomy is a feature of

(a) C3 plants

(b) CAM plants

(c) C4 plants

(d) All of these

Answer: (c) C4 plants

17. Which of the following is a 4-carbon compound?

(a) Oxaloacetic acid

(b) Phosphoglyceric acid

(c) Ribulose biphosphate

(d) Phosphoenolpyruvate

Answer: (a) Oxaloacetic acid

18. Which of the following process (C4 cycle) occurs in bundle sheath cells?

(a) Regeneration

(b) Fixation

(c) Carboxylation

(d) Decarboxylation

Answer: (d) Decarboxylation

19. Light reactions of photosynthesis occurs in

(a) stroma

(b) thylakoid

(c) grana

(d) cytoplasm of cell

Answer: (c) grana

20. Water stress causes

(a) opening of stomata

(b) increase in metabolic rate

(c) wilting of leaves

(d) lesser availability of carbon dioxide

Answer: (c) wilting of leaves