STD 11 - 13. Plant growth and development — NEET STD 11 Science — Question

Which one of the following statements about Histones is wrong?

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.

In a food web, each successive trophic level has

The upright pyramid of number is absent in

Plants adapted to low light intensity have

Select the correct statements for chemiosmosis hypothesis
a. Chemiosmosis requires a membrane, a proton pump, a proton gradient and ATP synthase
b. It is related with ATP formation
c. ATP synthase has a channel that allows diffusion of protons back across the membrane, this release enough energy to activate ATP synthase enzyme that catalyses the formation of ATP.
d. The breakdown of the gradient provides enough energy to cause a confirmational change in the CF1 particle of the ATP synthase, which makes the enzymes synthesise several molecules of energy packed ATP

An organic substance that can withstand environmental extremes and cannot be degraded by any enzyme is

In a food chain, lion is a

Assertion (A): The presence or absence of hymen is not a reliable indicator of virginity or sexual experience.
Reason (R): The hymen is often torn during the first coitus however it can also be broken by a sudden fall or jolt, insertion of a vaginal tampon, active participation in some sports like horseback riding, cyclling etc.