10
MCQ (Single Correct Answer)
Select the correct statement about $G_1$ phase
A
cell is metabolically inactive
B
DNA in the cell does not replicate
C
it is not a phase of synthesis of macromolecules
D
cell stops growing
11
Between a prokaryote and a eukaryote, which cell has a shorter cell division time?
Explanation
Prokaryotic cell has shorter cell cycle than the eukaryotic cell.
12
Which of the phases of cell cycle is of longest duration?
Explanation
Interphase is of the longest duration. It has following events and is divided in the following phases
(a) $G_1$ phase (Gap 1) Corresponds to the interval between mitosis and initiation of DNA replication. Cell is metabolically active and continuously grows but does not replicate its DNA.
(b) S-phase (Synthesis phase) Marks the period during which DNA synthesis or replication takes place.
(i) Amount of DNA per cell doubles.
(ii) No increase in chromosome number.
(c) $\mathrm{G}_2$ Phase (Gap 2) Proteins are synthesised for the preparation of cell division, while cell growth continues.
13
Name a stain commonly used to colour chromosomes.
Explanation
Acetocarmine and Giemsa stain can be used to stain the chromosomes.
14
Which tissue of animals and plants exhibits meiosis?
Explanation
Meiosis is a special kind of cell division, also called as reduction division, which occurs in germ cells or sex cells of male and female reproductive organs of plants and animals. They produce male
and female 
gametes that take part in sexual reproduction.