CBSE Class 11 Biology Plant Growth and Development MCQs Set B

Question: The process of growth is maximum during
a) log phase
b) lag phase
c) senescence
d) dormancy.
Answer : A

Question: Which hormone is responsible for fruit ripening?
a) Ethylene
b) Auxin
c) Ethyl chloride
d) Cytokinin
Answer : A

Question: What is the quantum yield of photosynthesis ?
a) 9%
b) 12%
c) 8%
d) 38%
Answer : B

Question: Long day plants produce flowers when they exposed to-
a) Any random duration of light.
b) Light period longer than a critical day length.
c) Light period longer than 14 hrs only
d) Light period shorter than a critical day length
Answer : B

Question: Which of the following steps during glycolysis is associated with utilization of ATP?
a) Glucose – Glucose-6-phosphate
b) Frutose-6-phosphate–Fructose-1-6- bisphosphate
c) PEP – Pyruvic acid
d) Both 1 and 2
Answer : D

Question: Deficiency of which of the following elements leads to discolouration of leaves?
a) Na
b) Ca
c) Cu
d) Mg
Answer : D

Question: Through their effects on plant growth regulators, what do the temperature and light control in theB plants?
a) Apical dominance
b) Flowering
c) Closure of stomata
d) Fruit elongation
Answer : B

Question: C₂H₅OH is commercially produced through a particular species of-
a) Saccharomyces
b) Clostridium
c) Trichoderma
d) Aspergillus
Answer : A

Question: Photolysis of water is associated with:
a) PS-I
b) PS-II
c) Stroma lamella
d) Stroma
Answer : B

Question: Refer the given reaction. What does it depict?

a) Oxidadative amination
b) Reductive amination
c) Transamination
d) Deamination
Answer : C

Question: Which of the given statements is incorrect ?
a) Mineral nutrients have multi-directional flow through xylem in plants.
b) Transport in xylem is from roots to stem.
c) Mineral nutrients are transported upwards from roots to different parts of plant.
d) Organic Nutrients are exported from photosynthetic leaves to all parts of plant.
Answer : A

Question: Which statements are correct?
a. Cytokinins suppress the synthesis of chlorophyll.
b. Auxin causes apical dominance.
c. Gibberellin promotes stem elongation.
d. Abscisic acid enables seeds to withstand desiccation.
Options :
a) c and b only
b) b and c only
c) a and c only
d) b, c, and d only
Answer : D

Question: During seed germination, its stored food is mobilized by
a) ABA
b) gibberellin
c) ethylene
d) cytokinin.
Answer : B

Question: Which of the following prevents the fall of fruits?
a) GA3
b) NAA
c) Ethylene
d) Zeatin
Answer : B

Question: Select the option which is not correct with respect to enzyme action :-
a) Substrate binds with enzyme at its active site to form enzyme substrate complex.
b) Addition of lot of succinate does not overcome the inhibition of succinic dehydrogenase by malonate.
c) A non-competitive inhibitor can bind with the allosteric site of the enzymes.
d) Malonate is a competitive inhibitor of succinic dehydrogenase.
Answer : B

Question: Which is produced during water stress that brings stomatal closure?
a) Ethylene
b) Abscisic acid
c) Ferulic acid
d) Coumarin
Answer : B

Question: Which of the following statements is incorrect in relation to leghaemoglobin?
a) Leghaemoglobin function as oxygen scavenger.
b) It is synthesized by living cell.
c) It makes nodules pink coloured.
d) It oxidizes enzyme nitrogenase.
Answer : D

Question: Cell elongation in internodal regions of the green plants takes place due to
a) indole acetic acid
b) cytokinins
c) gibberellins
d) ethylene.
Answer : D

Question: —— is present in cysteine and methionine and is the main constituent of several coenzyme-
a) Magnesium
b) Sulphur
c) Potassium
d) Phosphorus
Answer : B

Question: Dwarfness can be controlled by treating the plant with
a) cytokinin
b) gibberellic acid
c) auxin
d) anti-gibberellin.
Answer : B