Which of the following is an incorrect statement?
Answer: (C) Mature sieve tube elements possess a conspicuous nucleus and usual cytoplasmic organelles. Answer: (C) Mature sieve tube elements possess a conspicuous nucleus and usual cytoplasmic organelles Solution: Statement (c) is incorrect: NCERT states that some mature cells even lack a nucleus, citing the sieve tube cells of vascular plants (and erythrocytes of many mammals), so mature sieve tube elements do not possess a conspicuous nucleus.
- A.The perinuclear space forms a barrier between the materials present inside the nucleus and that of the cytoplasm
- B.Nuclear pores act as passages for proteins and RNA molecules in both directions between nucleus and cytoplasm
- C.Mature sieve tube elements possess a conspicuous nucleus and usual cytoplasmic organelles✓
- D.Microbodies are present both in plant and animal cells
Correct Answer
(C) Mature sieve tube elements possess a conspicuous nucleus and usual cytoplasmic organelles
Solution & Explanation
Answer: (C) Mature sieve tube elements possess a conspicuous nucleus and usual cytoplasmic organelles Solution: Statement (c) is incorrect: NCERT states that some mature cells even lack a nucleus, citing the sieve tube cells of vascular plants (and erythrocytes of many mammals), so mature sieve tube elements do not possess a conspicuous nucleus. The perinuclear space and nuclear envelope do form a barrier (a), nuclear pores permit two-way RNA and protein movement (b), and microbodies occur in both plant and animal cells (d) - all correct. NCERT Reference: Ch 8, p.100, lines 36-37: "nucleus, e.g., erythrocytes of many mammals and sieve tube cells of"