The blood calcium level is lowered by the deficiency of
(a) parathormone (b) thyroxine (c) both calcitonin and parathormone (d) calcitonin
A peptide hormone secreted by the parathyroid […]
Select one of the following pairs of important features distinguishing Gnetum from Cycas and Pinus and showing affinities with angiosperms
(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?
(a) Pteris (b) Funaria (c) Polytrichum (d) Cedrus
Male and […]
Earthworms during burrowing, the anterior end becomes turgid and acts as a hydraulic skeleton because
(a) coelomic fluid (b) blood (c) gut peristalsis (d) setae
Earthworms have no […]
Which one of the following groups of three animals each is correctly matched with their one characteristic morphological feature?
(a) Liver fluke, Sea anemone, Sea cucumber – Bilateral symmetry (b) Centipede, Prawn, Sea […]
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 […]