EAMCET Botany Practice Questions

1. The most important external factor which governs the rate of photosynthesis is
1) Sunlight 2) CO2 3) Water 4) Temperature

2. Light between the wave length of 390 nm and 760 nm is very effective in photosynthesis. It is called
1) Red light 2) PAR 3) Blue light 4) Green light

3. Find out the wrong statement from the following.
1) Chl-a alone converts the light energy into chemical energy.
2) LHC transfers radiant energy to reaction center by a process called Resonance transfer.
3) LHC acts as Antenna.
4) PS-I consists more carotenes & xanthophylls.

4. Excited Chlorophyll (Chl*) is in excited state for
1) 10 seconds 2) 10-8 seconds 3) 10-9seconds 4) 10-9 minutes

5. P700 and P680 are-
1) Both Chl-a
2) P700- Chl-a, P680 - Chl-b
3) Both Chl-b
4) P700- Chl-b, P680- Chl-a

6. The ratio between Chl-a and Chl-b in PS-I and PS-II respectively
1) 2 : 1, 1 : 2 2) 3 : 1, 4 : 3
3) 1 : 1, 4 : 3 4) 4 : 1, 1 : 1

7. The following physiologist is concerned with the discovery of 2 photochemical reactions occuring in the chloroplast involving 2 separate photosystems.
1) Robert Hill 2) Emerson 3) Hill and Bendall 4) Blackman

8. Emerson worked on the following plant.
1) Yeast 2) Hydrilla 3) Chlorella 4) Scenedesmus

9. The phenomenon that lead to the discovery of 2 pigment systems
1) Red drop
2) Emerson Enhancement effect
3) Warburg effect
4) Hills reaction

10. Pheophytin means
A) Chlorophyll without Mg
B) Colourless chlorophyll
C) Chlorophyll with 2H+ in the place of Mg
D) Normal Chlorophyll
1) A, B, C 2) D only 3) A, B, C, D 4) B, D

11. A herbicide that inhibits Non-cyclic electron transport
1) BA 2) 2, 4, 5 -T 3) 2, 4 -D 4) DCMU

12. Photolysis of water occurs in
1) Chloroplast 2) Thylakoids 3) Grana 4) Lumen

13. Z- scheme of electron tranport was proposed by
1) Hill 2) Emerson 3) Hill and Bendall 4) Blackman

14. Read the following lists
List - I List - II
A) DCMU I. Hills oxidant
B) Potassium Ferric Oxalate II. OEC
C) Niacin III. Herbicide
D) Ca2+ IV. NADP+
V. ATP
The correct match is
A B C D
1) IV II III I
2) III I IV II
3) I III IV V
4) V I II IV

15. Primary electron acceptor of Photosystem-II
1) Pheophytin 2) P680 3) P700 4) Ferredoxin

16. PS-II in Non- cyclic electron transport undergoes
1) Oxidation 2) Oxidation & Reduction
3) Reduction 4) Photophosphorylation

17. Number of enzymes participating in Noncyclic electron transport
1) 0 2) 4 3) 2 4) 1

18. For each of pair of electrons passing through cyclic or Non- cyclic electron transport, contributes how many protons into the lumen.
1) 6 2) 4 3) 2 4) 8

19. Non - cyclic electron transport means
1) The electrons released from water go to NADP+ and will not come back to water again.
2) NADP+ receives the electrons each time from different source.
3) NADP+ receives the electrons always from the same source.
4) Pheophytin receives electrons everytime from P680.

20. Select from the following which are present towards lumen
(A) and stroma side (B)
I. Ferredoxin II. OEC III. PQ
IV. CF1 V. PC VI. CF0
1) A-II IV I, B-III V VI 2) A-III, IV, I B-II V VI
3) A-II V VI, B-III IV I 4) A-I II III, B-IV V VI

21. One of the following is not a component of OEC
1) 4 Mn2+ 2) Ca2+ 3) Fe2+ 4) Cl -

22. One of the following statements about Plastocyanin is false.
1) PC is called mobile electron carrier.
2) In Photosynthesis it receives electrons from Cyt f.
3) It is a protein with Copper.
4) It is present in the thylakoid membrame and faces towards stroma.

23. One of the following statements about Ferredoxin is false.
1) Ferredoxin is an iron - sulphur protein.
2) It is present in the thylakoid membrane towards stroma.
3) It receives electrons from P700.
4) It always gives electrons to NADP+

24. Cyt. b6 in Light reaction receives electrons from
I. Ferredoxin II. Pheophytin III. PQÂÆjö
1) I, III 2) I, II 3) II, III 4) I, II, III

25. Assertion (A): Blue light has more energy than red light.
Reason (R): The energy in each photon is inversely proportional to wave length
1) Both (A) and (R) are true and (R) is the correct explanation of (A).
2) Both (A) and (R) are true but (R) is not the correct explanation of (A).
3) (A) is true, but (R) is false.
4) (A) is false, but (R) is true.

26. Assertion (A): NADPH is not formed in cyclic photophosphorylation.
Reason (R): Photolysis of water do not occurs in cyclic photophosphorylation.
1) Both (A) and (R) are true and (R) is the correct explanation of (A).
2) Both (A) and (R) are true but (R) is not the correct explanation of (A).
3) (A) is true, but (R) is false.
4) (A) is false, but (R) is true.

KEY : 1-1 2-2 3-4 4-3 5-1 6-4 7-2 8-3 9-2 10-1 11-4 12-4 13-3 14-2
15-1 16-2 17-4 18-2 19-1 20-3 21-3 22-4 23-4 24-1 25-1 26-1.

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