23. Cells that are living but not containing nucleus are
(a) Tracheids (b) Collenchyma (c) Sieve tubes
24. Cartilage is not found in
(a) Nose
(b) Ear
(c) Kidney
(d) Trachea
Answers
23. Answer:
Correct option is
(c) Sieve tubes
Explanation:
In plant anatomy, sieve tube elements, also called sieve tube members, are highly specialized type of elongated cell in the phloem tissue of flowering plants. Unlike the water-conducting xylem vessel elements that are dead when mature, sieve elements are living cells. They are unique in lacking a nucleus at maturity.
So, the correct answer is 'Sieve tubes.'
24. Answer:
Cartilage is not found in
c) Kidney
Explanation:
As cartilage is a structural component of our body act as connective tissue which is not required in the kidney. ... They are flexible connective tissue mainly found in ribs, ear, nose etc. Cartilage is a tough and flexible tissue which is mainly acts as connective tissue in the body.