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प्रश्न
Most of the plants absorb nitrogen in one of the following forms. This is:
(a) proteins
(b) nitrates and nitrites
(c) urea
(d) atmospheric nitrogen
उत्तर
(b) nitrates and nitrites
Plants cannot absorb atmospheric nitrogen. Plants can uptake nitrogen in the form of nitrates and nitrites only.
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संबंधित प्रश्न
All animals and fungi are autotrophs.
The leaves of a plant first prepare food A by photosynthesis. Food A then gets converted into food B. What are A and B?
(a) Name the pigment in leaves which absorbs sunlight energy.
(b) What is the colour of this pigment?
Name the pigment which can absorb solar energy.
Organisms that can prepare their own food.
An organism A which cannot move from one place to another, makes a simple food B from the substances C and D available in the environment. This food is made in the presence of a green coloured substance E present in organs F in the presence of light energy in a process called G. Some of the simple food B also gets converted into a complex food H for storage purposes. The food H gives a blue-black colour with dilute iodine solution.
(a) What is (i) organism A (ii) food B, and (iii) food H?
(b) What are C and D?
(c) Name (i) green coloured substance E, and (ii) organ F.
(d) What is the process G?
Do all cells use oxygen to produce energy?
Gas A, obtained above is a reactant for a very important biochemical process which occurs in the presence of sunlight. Identify the name of the process -
Oxygen liberated during photosynthesis comes from
Two green plants are kept separately in oxygen free containers, one in the dark and other in sunlight. It was observed that plant kept in dark could not survive longer. Give reason for this observation.
