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Resolving power of a light microscope is:

A.	0.1 micro metres	B.	0.2 micro metres
C.	0.3 micro metres	D.	0.4 micro metres

Mitochondria were seen first in:

A.	1850	B.	1900
C.	1940	D.	1975

Each gramme of water transpired absorbs _______ kj of latent eat from the leaf and its environment:

A.	2.0 - 2.1	B.	2.2 - 2.3
C.	3.4 - 3.5	D.	2.7 - 2.8

Quantasomes contain:

A.	200 chlorophyll molecules	B.	230 chlorophyll molecules
C.	250 chlorophyll molecules	D.	300 chlorophyll molecules

Rice plants exposed to temperatures below ______ ?C at the time of pollen-mother cell division will not produce a crop:

A.	22	B.	20
C.	19	D.	16

Soil water that is available to plants seldom has water potential more negative than:

A.	3.0 MPa	B.	? 1.5 MPa
C.	? 2.0 MPa	D.	? 2.5 MPa

Considering the supplies of total PAR to land area on growing crops, overall biomass product in efficiencies are always much below _____ per cent:

A.	30	B.	25
C.	18	D.	22

The amount of carbon dioxide has increased slowly since about 1850 from 28

A.	310	B.	320
C.	330	D.	340

It has been estimated that carbon dioxide content within the maize plant-canopies was 260 or less during day, whereas it rose to ______

A.	400	B.	500
C.	600	D.	700

10.

Direct sunlight at noon in late June in the northern hemisphere corresponds to _____ foot-candles:

A.	5,000	B.	7,500
C.	10,000	D.	12,000