Plant Physiology Multiple Choice Questions with Answers

Questions

61 A chemical believed to be involved in flowering is

A gibberellin

B kinetin

C florigen

D IBA

View Answer

Answer: florigen

62 The hormone responsible for apical dominance is

A IAA

B GA

C ABA

D Florigen

View Answer

Answer: IAA

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63 Twining of tendrils is due to

A thigmotropism

B seismonasty

C heliotropism

D diageotropism

View Answer

Answer: thigmotropism

64 Abscisic acid causes

A stomatal closure

B leaf expansion

C stem elongation

D root elongation

View Answer

Answer: stomatal closure

65 Photosynthetic pigments found in the chloroplasts occur in

A thylakoid membranes

B plastoglobules

C matrix

D chloroplast envelope

View Answer

Answer: thylakoid membranes

66 During monsoon, the rice crop of eastern states of India shows lesser yield due to limiting factor of

A C02

B light

C temperature

D water

View Answer

Answer: light

67 Dark reactions of photosynthesis occur in

A granal thylakoid membranes

B stromal lamella membranes

C stroma outside photosynthetic lamellae

D periplastidial space

View Answer

Answer: stroma outside photosynthetic lamellae

68 With an increase in the turgidity of a cell, the wall pressure will be

A fluctuate

B remain unchanged

C increase

D decrease

View Answer

Answer: increase

69 When a cell is fully turgid, which of the following will be zero?

A turgor pressure

B water potential

C wall pressure

D osmotic pressure

View Answer

Answer: water potential

70 NADPH2 is generated through

A photosystem II

B anaerobic respiration

C glycolysis

D photosystem I

View Answer

Answer: photosystem I

71 A pigment which absorbs red and far-red light is

A Cytochrome

B xanthophyll

C phytochrome

D carotene

View Answer

Answer: phytochrome

72 The core metal of chlorophyll is

A Ni

B Cu

C Fe

D Mg

View Answer

Answer: Mg.

73 Chlorophyll-a molecule at its carbon atom 3 of the pyrrole ring II has one of the following

A carboxylic group

B magnesium

C aldehyde group

D methyl group

View Answer

Answer: methyl group

74 Which one among the following chemicals is used for causing defoliation of forest trees?

A malic hydrazide

B 2, 4-D

C amo-1618

D phosphon D

View Answer

Answer: 2, 4-D

75 Phytochrome becomes active in

A red light

B green light –

C blue light

D none of these

View Answer

Answer: none of these.

76 The water potential and osmotic potential of pure

A 100 and 200

B zero and 100

C 100 and zero

D zero and zero

View Answer

Answer: zero and zero

77 Which combination of gases is suitable for fruit ripening?

A 80 % CH4 and 20% CO2

B 80% CO2 and 20% O2

C 80% C2H4 and 20% CO2

D 80% CO2 and 20% CH2

View Answer

Answer: 80% C2H4 and 20% CO2

78 A plant hormone used for inducing morphogenesis in plant tissue culture is

A Cytokinins

B Ethylene

C Abscisic Acid

D Gibberellins

View Answer

Answer: Cytokinins

79 The closing and opening of the leaves of Mimosa pitdica is due to

A seismonastic movement

B chemonastic movement

C thermonastic movement

D hydrotropic movement

View Answer

Answer: seismonastic movement

80 The rate of photosynthesis is higher in

A very high light

B continuous light

C red light

D green light

View Answer

Answer: red light

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