During biological nitrogen fixation, inactivation of nitrogenase by oxygen poisoning is prevented by :
Options
(a) Xanthophyll (b) Carotene (c) Cytochrome (d) Leghemoglobin
Correct Answer:
Leghemoglobin
Explanation:
No explanation available. Be the first […]
An association of individuals of different species living in the same habitat and having functional interactions is:
Options
(a) Biotic community (b) Ecosystem (c) Population (d) Ecological niche
Correct Answer:
Biotic community
Explanation: […]
Auxin can be bioassayed by :
Options
(a) Hydroponics (b) Potometer (c) Lettuce hypocotyl elongation (d) Avenacoleoptile curvature
Correct Answer:
Avenacoleoptile curvature
Explanation:
Avena coleptile curvature is used for the bioassay of auxin.
Male gametophytein angiosperms produces:
Options
(a) Single sperm and vegetative cell (b) Single sperm and two vegetative cells (c) Three sperms (d) Two sperms and a vegetative cell
Correct Answer:
Two sperms and […]
In angiosperms, microsporogenesis and megasporogenesis :
Options
(a) form gametes without further divisions (b) Involve meiosis (c) occur in ovule (d) occur in anther
Correct Answer:
Involve meiosis
Explanation:
No explanation available. Be […]
Body having meshwork of cell, internal cavities lined with food filtering flagellated cells and indirect development are the characteristics of phylum
Options
(a) Porifera (b) Mollusca (c) Protozoa (d) Coelenterate
Correct Answer:
Porifera
A jawless fish, which lays eggs in fresh water and whose ammocoetes larvae after metamorphosis return to the ocean is:
Options
(a) myxine (b) Neomyxine (c) Petromyzon (d) Eptatretus
Correct Answer:
Petromyzon
Explanation: […]
The oxygen evolved during photosynthes is comes from water molecules. Which one of the following pairs of elements is involved in this reaction?
Options
(a) Manganese and Potassium (b) Magnesium and Molybdenum (c) […]
In photosynthesis the light-independent reactions take place at :
Options
(a) Photosystem-I (b) Photosystem-II (c) Stromal matrix (d) Thylakoid lumen
Correct Answer:
Stromal matrix
Explanation:
Stromal matrix contains a number of flattened membranous sacs […]
Chromatophores take part in:
Options
(a) Growth (b) Movement (c) Respiration (d) Photosynthesis
Correct Answer:
Photosynthesis
Explanation:
Chromatophores play an important role in the process of photosynthesis. They contain pigments and are found in […]
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