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Magazine Problem 124
Assertion: Meiosis takes place in pollen mother cells. Reason: Each pollen mother cell produces 4 haploid pollen grains.
Problem 125
Assertion: Meiotic division results in the production of haploid cells. Reason: Synapsis occurs during zygotene of meiosis.
Problem 127
Assertion: Prophase is characterised by formation of mitotic chromosome. Reason: Chromosomal material condenses in prophase stage.
Problem 128
Assertion: Morphology of chromosome is studied in metaphase stage. Reason: Condensation of chromosome is completed in this stage and can be easily visualised under microscope.
Problem 130
Assertion: In some social insect haploid cells divide by mitosis Reason: Growth of multicellular organism is due to mitosis
Problem 133
Assertion: The complex formed by a pair of synapsed homologous chromosome is called as tetrad. Reason: Each of the homologous chromosomes in meiotic prophase I consists a two closcly apposed sister chromatids.
Problem 134
Assertion: In oocytes, diplotene can last for months or years Reason: It is at this stage that chromosome decondense and engage in RNA synthesis
Problem 135
Assertion: Mitosis is called equational division. Reason: Mitosis is the division of parent cell into two identical daughter cells having the same amount of DNA as in parent cell.
Problem 136
Assertion: The interphase is considered as the most active stage of cell cycle. Reason: This phase is a period of intense synthesis and growth
Problem 137
Assertion: Disappearance of nuclear membrane is generally essential for karyokinesis. Reason: Forward movement of chromosomes is dependent on spindle apparatus, which organise is cytoplasm.
