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11.

The atmosphere has less carbon than other reservoirs but, it still contains about 700 billion tones and roughly percent is annually used in photosynthesis:

A.	5	B.	7.5
C.	10	D.	12.5

12.

H+ tons in thylaoid channels arise from oxidation of H2O and PQH2 cause H+ ions concentration in channels becomes; about ______ times as great as in the stroma when photosynthesis occurs:

A.	500	B.	750
C.	1000	D.	1250

13.

The total thickness of unit membrane fall in the range of:

A.	7 - 10	B.	70 - 100
C.	700 - 1000	D.	7,000 - 10,000

14.

The following percentage of water absorbed by herbaceous plants is lost in transpiration:

A.	80	B.	60
C.	99	D.	40

15.

At equilibrium, the vapour density or pressure about pure water in a closed container is:

A.	85%	B.	98%
C.	95%	D.	100%

16.

In water molecule, line-segments connecting the centres of the two hydrogen atoms with the centre of oxygen atoms form an angle of about:

A.	85	B.	95
C.	105	D.	115

17.

A maize plant to produce one kg of grain (dry) transpires _____ kg of water:

A.	900	B.	800
C.	700	D.	600

18.

Prokaryota means:

A.	A cell with many nuclei	B.	A cell without chloroplast
C.	A cell with diffused nucleus	D.	A cell with one nucleus

19.

Which one of the following factors causes an increase in transpiration rate?

A.	A hot dry windy day	B.	A cool damp windy day
C.	A hot damp windy day	D.	None of the above

20.

Wilting of plant results from excessive:

A.	Absorption	B.	Photosynthesis
C.	Respiration	D.	Transpiration