The chemical formula of carotene obtained from carrot is.
C40H56
C40H56O2
C55H72O5N4Mg
C55H70O6N4Mg
A thin film of water, held by the soil particles, under the influence of internal attractive force, is called which of the following water?
capillary
combined
hygroscopic
gravitational
The element molybdenum participates in
flowering
nitrogen fixation
chromosome coiling
carbon assimilation
How many essential elements are required for plant growth?
9
12
15
17
With an increase in the turgidity of a cell, the wall pressure will
increase
decrease
fluctuate
remain unchanged
Which of the following nutrients serve as macronutrients for plant growth?
C,H and O
K,N and S
Ca, Mg and P
all of these
Magnetium is absent in which of the following pigment?
Phycobillins
chlorophyII-a
chlorophyII-b
both '1' and '2'
How many ATP molecules are produced by aerobic oxidation of one molecule of glucose ?
2
14
34
38
Which of the following mineral helps in nitrogen fixation?
copper
zinc
molybdenum
magnesium
'Little leaf disease' is developed due to the deficiency of
sodium
