STD 11 - 8. Cell the unit of life — NEET STD 11 Science — Question

Statement I: Metaphase is characterized by metaphase plate.
Statement II: Anaphase is characterized by decondensation of chromosomes.

Non-membranous nucleoplasmic structures in nucleus are the site for active synthesis of

Assertion: One single maize root apical meristem can give rise to more than 17,500 new cells per hour.
Reason: Growth is expressed as increase in size of the cell.

Genus of potato and Brinjal

Which of the following observation most strongly support the view that mitochondria contain electron transfer enzymes aggregated into compact associations

A phosphoglyceride is always made up of

Which of the following statements are correct ?
(i) Vernalisation refers to the promotion of flowering by a period of high temperature.
(ii) The spring variety of crops are normally planted in the spring and come to flower before the end of the growing season.
(iii) It is not seen in biennial plants.
(iv) Subjecting cold treatment to sugar beet will result in flowering.
(v) Cytokinins specially help in delaying senescence.
(vi) Auxins are involved in regulating apical dominance.
(vii) Ethylene is specially useful in enhancing seed germination.
(viii) Gibberellins are responsible for immature falling of leaves.
(ix) Cytokinins promote senescence.
(x) Auxins control apical dominance.
(xi) Gibberellins promote shoot elongation.
(xii) Abscissic acid enables seeds to withstand desiccation.
Choose the correct option given below :-

Assertion : Vessels are more efficient for water conduction as compared to tracheids.
Reason : Vessels are dead lignified

Glycolysis

Biosphere reserve programme started in India in