Question # 1

If you observe a cell in which nuclear memberane is reforming around two sets of chromosomes, what stage of cell cycle is this

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Anaphase

Telephase

Metaphase

Prophase

Which one is the feature of mitosis but not of meiosis II?

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Crossing over

Separation of sister chromatids

Daughter cells with same number of chromosomes

Sepearation of homologous chromosomes

At which stage of mitosis chromosomes line up in the centre.

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Prophase

Anaphase

Metaphase

Telophase

The spindle apparatus of plants differs from that of animals innot having.

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Microtubules

Centromere

Centrioles

Equator of spindle

Some student of SSC observed a thin cross section ffrom root tip of onion plant under the microscope. They found divising cells at different stages of their life cycle. One of the students found a cell at late prophase and counted 28 chromosomes in it. The number of chromosomes in daughter cells should be.

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14

28

56

09

In which phase of cell cycle, the chromosomes duplicate.

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S Phase

G1 Phase

Mitosis

G2 Phase

Which event is unique to meiosis but not mitosis.

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DNA Replication

Crossing over

Chromosomes alignment

Nuclear division

Substance and energy required for replication for DNA is accumulated in cell during.

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G1

G2

S-Phase

M-Phase

Crossing over resuts in genetic recombination . It occurs between

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Two chromatids of homologous chromosomes

Two chromatids of opposite gametes

Two chromatids of any two non homologous chromosomes

Two chromatids of the same chromosome

The longest phase of meiosis is.

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Prophase I

Prophae II

Interphase I

Interphase II

Chromosomal number of fruit fly is 8 The gametes of fruit fly contain.

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2 Chromosomes

4 Chromosomes

8 Chromosomes

16 Chromosomes

Why is meiosis II necessary after meiosis I?

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To replicate chromosomes

To separate sister chromatids

To ensure genetic recombination

To reduce chromosomes number

An organism has 4 pairs of chromosoems . Afger meiosis-I , how many chromosomes and chromatids will be present in each daughter cell.

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8 Chromosomes and 16 chromatids

4 chromosomes and 8 chromatids

4 chromosomes and 4 chromatids

8 chromosomes and 8 chromatids

During celll division spindle fibres attach a chromosome at.

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Telomere

Centromere

Upper arm of chromosomes

Lower arm of chromosome

All of the following event takes place both in mitosis and meiosis except.

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Condensation of chromatin to form chromosomes

Formationof spinde apparatus

Nuclear envelop and nucleolus disappear

Chromosomes pair for crossing over

How does the centrosome contribute to mitosis.

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Initiates DNA replication

Make mitotic spindle

Forms the nuclear envelope

Duplicates organelles

In which phase of cel cycle, maximum growth occurs inc ell.

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M Phase

S Phase

G2 Phase

G1 Phase

What causes the number of chromosomes to reduce to half when a cell divides by meiosis.

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Seperation of homologous chromosomes during meiosis I

Replication of DNA during interphase I

Seperation of sister chromatids of all the chromosomes durng meiosis I

Crossing over during meiosis I

Centrosomes make mitotic spindle in.

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Plant cells

Animal Cells

Prokaryotic cells

All of these

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