Plant Physiology Quiz 1

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

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

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

The amount of carbon dioxide has increased slowly since about 1850 from 28 μl/l to slightly more _________μl/l  in 1962.

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

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

Quantasomes contain:

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

Mitochondria were seen first in:

Resolving power of a light microscope is: