Botany MCQ Quiz Hub

1. Which among the following pigment absorbs the red and far red light ?
Cytochrome
Chlorophyll a
Chlorophyll c
Phytochrome

2. Which among the following is a 4-C compound ?
Phosphoglyceric acid
Oxaloacetic acid
Ribulose biphosphate
Ribulose triphosphate

3. Which fractions of the visible spectrum of solar radiations are primarily absorbed by carotenoids of the higher plants ?
Voilet and red
Violet and blue
red and blue
none

4. The law of limiting factors was proposed with particular reference to photosynthesis. who among the following scientist proposed this law ?
Blackman
Weismann
Calvin
None

5. Energy from light reaction to dark reaction in photosynthesis is transferred in the form of
ATP
ADP
DNA
RNA

6. The shape of the chloroplast in higher plants is ?
Cup-shaped
Discoid
Reticulate
Girdle-shaped

7. In C4 plants, the bundle sheath cells
Are rich in PEP carboxylase
Have large intercellular spaces
Have thin walls to facilitate gaseous exchange
None

8. In C3 plants,which among the following is the first stable product of photosynthesis during the dark reaction is
3-phosphoglyceric acid
Oxaloacetic acid
Phosphoglyceraldehyde
Acetic acid

9. Hill reaction occurs in which of the following
Total darkness
Absence of water
Presence of ferricyanide
None

10. Etiolation in plants is caused when
They have mineral deficiency
They are grown in intense light
They are grown in blue light
They are grown in dark

11. During photorespiration, the conversion of phosphoglycolate to glycolate takes place in this cell organelle
Mitochondia
Chloroplast
Ribosome
Peroxisome

12. Chloroplast dimorphism is a characteristic feature of
C4-Plants
Plants with Calvin cycle
All plants
None

13. In Kranz anatomy the bundle sheath cells have ?
Thin walls, no intercellular spaces and several chloroplasts
Thick walls, no intercellular spaces and large number of chloroplasts
Thin walls, many intercellular spaces and no chloroplasts
Thick walls, many intercellular spaces and few chloroplasts

14. Which among the following In photosystem-I, the first electron acceptor
An iron sulphur protein
Plastocyanin
Cytochrome
Chlorophyll

15. Both photosynthesis and respiration require which of the following ?
Sunlight
Mitochondria
Chloroplast
None

16. Bacterial photosynthesis involves the
PS- I
PS- II
Both A and B
None

17. How many additional molecules of ATP are needed for net production of one molecule of hexose sugar by C4-plants as compared to C-3 plant ?
6
8
10
12

18. A process that makes important difference between C-3 and C-4 plants is
Guttaion
Transpiration
Photorespiration
Photosynthesis

19. A plant with low CO2 compensation point is
Gossypium hirsutum
Tidestromia Oblongifolia
Leucopoa kingii
Atriplex patula

20. Which among the following is not true about the light reactions of photosynthesis
P-680 and P-700 are the reaction centres of PS I an PS II respectively reactions
NADPH is not produced in cyclic electrons transport in light reactions
The flow of electrons from water to NADP in non-cyclic electron transport produces one ATP
None

21. Which among the following statements regarding C-4 plants is false ?
The primary CO2 acceptor is a 5 carbon molecule
The primary CO2 acceptor is a 7 carbon molecule
Both A and B
The initial carboxylation reaction occurs in mesophyll

22. Which among the following is wrongly matched ?
PS II – P700
PEP carboxylase – Mesophyll cells
Blackman – Law of limiting factors
More than one option is correct

23. The synthesis of 1 molecule of glucose during Calvin cycle requires a
18 molecules of ATP and 12 molecules of NADPH2
12 molecules of ATP only
16 molecules of ATP and 12 molecules of NADPH2
None

24. The pathway that will produce oxygen during photosynthesis is
noncyclic electron pathway
electron transport pathway
cyclic electron pathway
light-independent reactions

25. The net requirement of assimilator power for the formation of 6 hexose molecules in maize plant is
190 ATP, 74 NADPH
180 ATP, 72 NADPH
170 ATP, 70 NADPH
160 ATP, 68 NADPH

26. RuBisCO stands for
Ribulose phosphate carboxylase oxygenase
Ribulose phosphate carboxylic oxygenase
Ribulose bisphosphate carboxylase oxygenase
None

27. Photosynthesis in C-4 plants is relatively less limited by atmospheric CO2 levels because
The primary fixation of CO2 is mediated via PEP carboxylase
Effective pumping of CO2 into bundle sheath cells
Rubisco in C4 plants has higher affinity for CO2
None

28. Which among the following is wrong in relation to photorespiration
It is a characteristic of C-4 plants
It occurs in daytime only
It is a characteristic of C-3 plants
It occurs in chloroplasts

29. Which among the following is the best defined function of Manganese in green plants ?
Water absorption
Photolysis of water
Water absorption
Calvin cycle

30. Which among the following enzyme is responsible for primary carboxylation in C-3 plants ?
RuBP carboxylase oxygenase
Succinic dehydrogenase
Hexokinase
None

31. Which among the following is the first stable compound formed after CO2 fixation In C-3 plants?
Oxaloacetic acid
Malic acid
3-phosphoglycerate
none

32. Chemiosmosis hypothesis given by Peter Mitchel proposes the mechanism of
synthesis of ATP
synthesis of ADP
synthesis of NADH
None

33. The ratio between 2-carbon and 3-carbon intermediates having -NH2 group formed in photosynthetic oxidation cycle is
3:02
4:02
4:01
2:01

34. Continuity of cytoplasm from one cell to its neighbouring cells In higher plants is established through
Apoplas
Symplast
Chloroplast
Topoplast

35. In CAM plants, CO2 required for photosynthesis enters the plant body during ?
Night when the hydathodes are open
Night through the stomata which are kept open
Daytime through the lenticels
Daytime when the stomata are open

36. The concentration of organic acid in a CAM plant ?
increases during night
increases during day
decreases during night
decreases during any time

37. Ganongs respiroscope is used to demonstrate
production of carbon dioxide during aerobic respiration
evolution of oxygen during photosynthesis
evolution of carbon dioxide during fermentation
production of heat during aerobic respiration

38. Photosynthesis cannot continue for long if during light reaction, only cyclic photophosphorylation takes place. This is because of the following
There is no evolution of O2
There is unidirectional cyclic movement of the electrons
Photosystem I stops getting excited at a wavelength of light beyond 680 nm
None

39. Who enunciated the law of limiting factor for photosynthesis ?
Blackman
Robert Emerson
Calvin
None

40. Who among the following was discover the process of photophosphorylation ?
Blackman
Arnon
Robert Emerson
Ruben

41. PGA as the first CO2 fixation product was discovered in photosynthesis of
Bryophyte
Alga
Angiosperm
Gymnosperm

42. Which among the following is the end product of the Calvin cycle ?
ATP
RuBP
ADP
None

43. Which among the following statement is true for ATP ?
ATP is a Co-enzyme
ATP is prosthetic part of an enzyme
ATP is an enzyme
ATP is organic ions of enzyme

44. The metabolic pathway which produces carbohydrate is
Glycolysis
Cyclic electron pathway
Calvin cycle
none

45. Glycolysis -
Reduces two molecules of NAD+ for every glucose molecule processed
Takes place in the mitochondria
Produces no ATP
Has no connection with electron transport chain

46. In ___ NADP is converted into NADPH2
Cyclic photophosphorylation
Photolysis
Noncyclic photophosphorylation
Oxidative phosphorylation

47. Which among the following doesnt play any role in photosynthesis ?
Phycocyanin
Anthocyanin
Phycoerythrin
none

48. Where does bulk fixation of carbon through photosynthesis take place ?
Oceans
Crop plants
Tropical rain forests
none

49. Which among the following substances yield less than 4 Kcal/mol when its phosphate bond is hydrolyzed ?
ATP
Creatine Phosphate
ADP
None

50. Which among the following is the correct sequence of cell organelles during photorespiration ?
Mitochondria - Chloroplast - Peroxisome
Chloroplast - peroxisome – mitochondria
Peroxisome - Chloroplast - Golgi Body
None