Question

The durations of mitotic stages in two situations,(A and B) are tabulated below:

	Duration of Mitotic Stages (in Minutes)	Duration of Mitotic Stages (in Minutes)
Phase	A	B
Interphase	$1356\left(22.6h\right)$	$870\left(14.5h\right)$
Prophase	$126$	$54$
Metaphase	$24$	$14$
Anaphase	$5$	$3$
Telophase	$22$	$11$
Total	$1533\left(25.6h\right)$	$952\left(15.9h\right)$

Following are some interpretations:

I.'A' and 'B' indicate the same plant tissue grown at higher and lower temperature respectively.
II.'A' indicates a slow-growing plant species and 'B' indicates a slow-growing plant species.
III.Both 'A' and 'B' indicate dormant plant tissues with excessively long interphase.
The correct interpretations is/are.

• A. I and III
• B. II and III
• C. III only
• D. II only

Answer 1

The correct option is D II only

• The cell cycle is the series of events that take place in a cell leading to its division and duplication. A cell cycle is divided into two periods interphase and mitotic phase. Interphase is further of three stages $G_1$,$S$ and $G_2$.
• During interphase. the cell grows accumulating nutrients needed for cell division. The most significant event of interphase is the replication of genetic material (DNA) is the S phase. Interphase lasts for at least $90\%$ of the total time of the cell cycle.
• The mitotic phase consists of nuclear division. It is a relatively short period of the cell cycle, account approximately $10\%$ of the cell cycle.
• The duration of the cell cycle varies among organisms and among cells of different tissues such as mature cells take a longer time for cell cycle whereas cells at embryonic stage take a short time.
• Considering the given data then the duration of each event of the cell cycle in plant A is comparatively more than plant B, it can be interpreted that plant A is slow-growing species and plant B is faster relatively.