Q4. Assertion: plant cells divide their cytoplasm by forming a cell plate. Reason: plant cells are enclosed by a relatively inextensible cell wall. Are both true, and does the reason explain the assertion?
Both are true, and the reason explains the assertion (NCERT page 124).
Q5. Which stage of mitosis is marked by the complete disintegration of the nuclear envelope?
The start of metaphase, in NCERT’s four stages (NCERT page 123).
Q6. What is a syncytium? Give NCERT’s example.
A multinucleate condition that arises when karyokinesis is not followed by cytokinesis; the liquid endosperm of coconut (NCERT page 124).