NCERT Biology Photosynthesis higher plants class-12 mcqs,notespdfs

Photosynthesis Higher Plants Mock Exam-9

Question No:1

Internal factor affecting photosynthesis are

[A] number and size of leaf
[B] age of leaf and orientation
[C] internal CO2 cone, and amount of chlorophyll
[D] all



Question No:2

Internal factor of plant depends on

[A] growth of plant
[B] genetic predisposition
[C] both
[D] none



Question No:3

Which is a limiting factor?

[A] Green leaf
[B] Optimal light
[C] Optimal CO2
[D] Low temperature



Question No:4

Photosynthesis is affected by

[A] quality of light
[B] intensity of light
[C] duration of light
[D] all



Question No:5

Light saturation occurs at ____ % of the fall sunlight.

[A] 2%
[B] 5%
[C] 10%
[D] 20%



Question No:6

Light may be a limiting factor for

[A] plants in dense forest
[B] plant in temperate forest
[C] plant in grassland
[D] all



Question No:7

What is the relationship between CO2 fixation and incident light at low intensities?

[A] Linear
[B] Parabola
[C] Hyperbola
[D] None



Question No:8

Select the incorrect statement from the following:

[A] At high intensities, both C3 and C4 plants shows increase in rate of photosynthesis by increasing CO2 concentration
[B] C4 plants shows saturation at 360 µl/L
[C] C3 plant shows saturation beyond 450 µl/L
[D] Productivity of tomatoes and ball papers can’t be increased by enriching environment by Co2



Question No:9

Select the incorrect statement from the following:

[A] Dark reaction is more sensitive to temperature
[B] Light reaction is less sensitive to temperature
[C] C4 plant respond to higher temperature and C3 plant have lower optimum temperature
[D] Tropical plant have lower optimum temperature for photosynthesis



Question No:10

Water stress leads to

[A] closing of stomata
[B] wilting of leaves
[C] reduced activity of leaf
[D] all



Question No:11

Which factor affect indirectly to process of photosynthesis?

[A] Light
[B] Temperature
[C] CO2 concentration
[D] Water



Question No:12

Photosynthesis takes place

[A] only in sunlight
[B] only in yellow light
[C] in the visible light obtained from any source
[D] only in very high intensity of light



Question No:13

Photo-oxidation of chlorophyll is called

[A] intensification
[B] chlorosis
[C] solarization
[D] defoliation



Question No:14

Which one of the following is not a limiting factor for photosynthesis?

[A] Oxygen
[B] Carbon dioxide
[C] Chlorophyll
[D] Light



Question No:15

If a plant is kept in 300ppm CO2 concentration, what will happen to it?

[A] plant will die soon
[B] plant will grow but will not die
[C] plant will show normal photosynthesis
[D] respiration will be greatly decreased