PART - 2 - Unit V : CH - 14 Breathing and Exchange of Gases — BIOLOGY STD 11 Science — Question

Mention any condition under which PS-I functions.

What is the reason of hard matrix of bones?

Write the scientific name of a flightless bird and an tuoviparous mammal.

Name the phase of nuclear division which is described by each of the following sentences:
(i) Disappearance of nuclear membrane.
(ii) Reappearance of nuclear membrane and nucleus.
(iii) Due to division of centromere and shortening of spindle fibres, chromatids reach towards opposite poles.
(iv) Chromosomes establish themselves on the equatorial plate of spindle and spindle fibres get attached to the centromere.

Write the mode of excretion performed by Xenopus.

Which one of the plant growth regulators would you use if you are asked to: (a) induce rooting in a twig (b) quickly ripen a fruit (c) delay leaf senescence (d) induce growth in axillary buds (e) 'bolt' a rosette plant (f) induce immediate stomatal closure in leaves.

What is the shape of tadpole of frog? Name the hormone that helps in its metamorphosis.

Name a muscle that has involuntary and striated characteristics.

Brassica campestris Linn:
What is the meaning of Linn written at the end of the name?

From which Latin word is the word 'Systematics' taken?