Q. Which of the following is/are true for nucleus?
  1. The nucleus has a double layered covering called nuclear membrane.
  2. The nucleus contains chromosomes, which are visible as rod-shaped structures.
Select the correct answer from the codes given below:

Answer: Only 1
Notes: The nucleus has a double layered covering called nuclear membrane. The nuclear membrane has pores which allow the transfer of material from inside the nucleus to its outside, that is, to the cytoplasm. The nucleus contains chromosomes, which are visible as rod-shaped structures only when the cell is about to divide.