The part of earth and atomosphere supporting life is
Options
(a) biota (b) ecotone (c) biome (d) biosphere
Correct Answer:
biosphere
Explanation:
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An orbital in which n = 4 and l = 2 is expressed by
Options
(a) 4s (b) 4p (c) 4d (d) 5p
Correct Answer:
4d
Explanation:
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Who discovered jumping genes in maize?
Options
(a) Milton Rand (b) Hugo de Vries (c) Keith Porter (d) Barbara mc Clintock
Correct Answer:
Barbara mc Clintock
Explanation:
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Rough endoplasmic reticulum differs from smooth walled endoplasmic reticulum due to the presence of
Options
(a) DNA (b) ribosomes (c) nucleus (d) ergastic substance
Correct Answer:
ribosomes
Explanation:
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The pigment haemocyanin is found in
Options
(a) chordata (b) mollusca (c) annelida (d) echinodermata
Correct Answer:
mollusca
Explanation:
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Histamines are secreted by
Options
(a) mast cells (b) macrophages (c) Kupffer cells (d) Nissl’s granules
Correct Answer:
mast cells
Explanation:
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IUPAC name of CH₃–O–C₂H₅ is
Options
(a) ethyl-methyl ether (b) methoxyethane (c) methyl-ethyl ether (d) none of these
Correct Answer:
methoxyethane
Explanation:
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The number of water molecules in gypsum and in plaster of paris are respectively
Options
(a) 2 and 1/2 (b) 5 and 2 (c) 2 and 1 (d) 7 and 2
Correct Answer: […]
Decomposers are
Options
(a) autotrophs (b) autoheterotrophs (c) heterotrophs (d) organotrophs
Correct Answer:
heterotrophs
Explanation:
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Which of the following is the largest root parasite
Options
(a) Rafflesia (b) Areuthobium (c) Monotrapa (d) Pistia
Correct Answer:
Rafflesia
Explanation:
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