STD 12 - 11. organisms and populations — NEET STD 11 Science — Question

Most animals that live in deep oceanic waters are

In which of the following respect, the plant hormones differ from enzymes

Assertion: Hybrid seeds have to be produced every year.
Reason: If the seeds collected from hybrids are sown, the plants in the progeny will segregate and do not maintain hybrid characters.

The most effective wavelength of visible light in photosynthesis is in the region of

Which is not a monocot

Assertion (A) : In epidermal tissue system the epidermal appendages are always unicellular
Reason (R) : The root hairs are unicellular while trichomes are usually multicellular

Which of the following statements are correct from given statement ?
(i) Glucose is the favoured substrate for respiration. All carbohydrates are usually first converted into glucose before they are used for respiration.
(ii) Other substrates like fats, proteins can also be respired but they do not enter the respiratory pathway at the first step.
(iii) If fatty acids were to be respired they would first be degraded to acetyl CoA and enter the pathway.
(iv) Glycerol would enter the pathway after being converted to PGAL.
(v) The proteins would be degraded by proteases and the individual amino acids and it enter the pathway at some stage within the Krebs' cycle or even as pyruvate or acetyl CoA.
(vi) Because the respiratory pathway is involved in both anabolism and catabolism it consider as an amphibolic pathway rather than as a catabolic one.

Which of the following is required as inducer(s) for the expression of Lac operon?

Generally archesporium in an ovule is

Presence of many embryos (Polyembryony) is a characteristic feature of