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What Is Tissue

Clowes report...

Question

Clowes reported quiescent centre in Zea mays which represents

A

Highest rate of mitotic divisions

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B

Slow DNA replication

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C

Slow mitotic divisions

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D

Both B and C

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Solution

The correct option is D Both B and C
The roots of all seed pants are known to have quiescent center as per research work by Clowes in Zea mays. Investigatory studies on this aspect through autoradiography shows that this is due to slow DNA replications and slow mitotic divisions.
Hence, the correct answer is option D.

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Q. Assertion :Clowes reported quiscent centre in Zea mays root, region behind rootcap. Reason: Méristème d'attente is region similar to this in shoot apex as its cells also have slow DNA replication.

Q. A human T lymphocyte in the mitotic metaphase stage will contain how many DNA molecules (exclude the DNA of mitochondria)?

Q. 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	$1356 (22.6 h)$	$870 (14.5 h)$
Prophase	$126$	$54$
Metaphase	$24$	$14$
Anaphase	$5$	$3$
Telophase	$22$	$11$
Total	$1533 (25.6 h)$	$952 (15.9 h)$

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.

Q. Study the diagram given below which represents a stage during the mitotic cell division and answer the questions that follow:
Name the parts numbered

1

2

.

Q. Study the diagram given below which represents a stage during the mitotic cell division and answer the questions that follow:
Identify the stage giving suitable reasons.

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