In the light of recent classification of living organisms into three domains of life (bacteria, archaea and eukarya), which one of the following statements is true about archaea?
Options
(a) Archaea resemble eukarya in […]
The rupture and fractionation do not usually occur in the water column in vessel / tracheids during the ascent of sap because of
Options
(a) lignified thick walls (b) cohension and adhesion (c) […]
The blood calcium level is lowered by the deficiency of
Options
(a) parathormone (b) thyroxine (c) both calcitonin and parathormone (d) calcitonin
Correct Answer:
parathormone
Explanation:
A peptide hormone secreted by the parathyroid […]
Subunits of 80S ribosomes are
Options
(a) 40S and 60S (b) 30S and 50S (c) 10S and 70S (d) 43S and 57S
Correct Answer:
40S and 60S
Explanation:
No explanation available. Be the […]
Select one of the following pairs of important features distinguishing Gnetum from Cycas and Pinus and showing affinities with angiosperms
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(a) absence of resin duct and leaf venation (b) presence of vessel […]
In which one of the following, male and female gametophytes do not have free living independent existence for?
Options
(a) Pteris (b) Funaria (c) Polytrichum (d) Cedrus
Correct Answer:
Cedrus
Explanation:
Male and […]
Which one of the following groups of three animals each is correctly matched with their one characteristic morphological feature?
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(a) Liver fluke, Sea anemone, Sea cucumber – Bilateral symmetry (b) Centipede, Prawn, Sea […]
Two simple harmonic motions of angular frequency 100 and 1000 rad s⁻¹ have the same displacement amplitude. The ratio of other maximum accelerations is:
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(a) 1 : 10 (b) 1 : 10² (c) […]
A point performs simple harmonic oscillation of period T and the equation of motion is given by x=a sin(ωt+π/6). After the elapse of what fraction of the time period the velocity of the point will […]
The velocity of electromagnetic radiation in a medium of permittivity ε₀ and permeability μ₀ is given by
Options
(a) √(ε₀ / μ₀) (b) √(μ₀ ε₀) (c) 1 / √(μ₀ ε₀) (d) √(μ₀ / ε₀)
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