Physiology TNPSC Group 2 2A Questions

Physiology MCQ Questions

1.

Which of the following is true Based on the nature of stimuli, tropism can be classified as follows

1. Phototropism: Movement of a plant part towards light. e.g. shoot of a plant.

2. Geotropism: Movement of a plant in response to gravity. e.g. root of a plant.

3. Hydrotropism: Movement of a plant or part of a plant towards water. e.g. root of a plant.

4. Thigmotropism: Movement of a plant part due to touch. e.g. climbing vines.

5. Chemotropism: Movement of a part of plant in response to chemicals. e.g. growth of a pollen tube in response to sugar present on the stigma

A.

1,2,3 are only true

B.

1,2,4,5 are true

C.

1,3,4,5 are true

D.

All are true

ANSWER :

D. All are true

2.
The end product of photosynthesis is X which will be converted into starch and stored in the plant body. What is X
A.
Glucose
B.
mannose
C.
fructose
D.
galactose
ANSWER :
A. Glucose
3.

Which are the following is needed for Photosynthesis

1. Chlorophyll - Green pigment in leaves

2. Water

3. Carbon dioxide (from air)

4. Glucose

5. Sun Light

A.

1,2,5 is needed

B.

1,2,3,5 is needed

C.

1,3,5 is needed

D.

All are needed

ANSWER :

B. 1,2,3,5 is needed

4.
The loss of water in the form of water vapour from the aerial parts of the plant body is
A.
evaporation
B.
translocation
C.
guttation
D.
transpiration
ANSWER :
D. transpiration
5.
In the transpiration process water evaporates through tiny pores called as
A.
stomata
B.
epidermal cell
C.
guard cell
D.
All
ANSWER :
A. stomata
6.
In which the exchange of air takes place in plants
A.
stomata
B.
epidermal cell
C.
guard cell
D.
All
ANSWER :
A. stomata