FBISE Class 9th (SSC-l)

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FBISE Class 9th (SSC-l)

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961
A. Equational division
B. Reductional division
C. Somatic division
D. Regenerative division
Answer: Meiosis is called reductional division because it halves the chromosome number.
962
A. Somatic cells
B. Reproductive organs (gonads)
C. Muscle cells
D. Nerve cells
Answer: Meiosis occurs in the reproductive organs where gametes are formed.
963
A. One
B. Two
C. Three
D. Four
Answer: Meiosis consists of two successive divisions: meiosis I and meiosis II.
964
A. 2
B. 4
C. 8
D. 16
Answer: One parent cell undergoing meiosis produces four haploid daughter cells.
965
A. Condensation of chromosomes
B. Synapsis and crossing over
C. Formation of spindle fibers
D. Division of the centromere
Answer: Synapsis (pairing of homologous chromosomes) and crossing over occur only in prophase I of meiosis.
966
A. Diploid
B. Haploid
C. Polyploid
D. Triploid
Answer: Meiosis halves the chromosome number, so the four daughter cells are haploid (n).
967
A. Meiosis II
B. Meiosis I
C. Interphase
D. Cytokinesis
Answer: In meiosis I, homologous chromosomes separate, reducing the chromosome number from 2n to n.
968
A. Somatic cells
B. Gametes
C. Skin cells
D. Muscle cells
Answer: Meiosis produces haploid gametes such as sperm and egg cells.
969
A. Anaphase I
B. Prophase I
C. Telophase II
D. Metaphase II
Answer: Prophase I is the longest phase of meiosis because synapsis and crossing over take place during it.
970
A. remain the same
B. double in every generation
C. become half
D. become zero
Answer: Without meiotic halving, the fusion of two gametes would double the chromosome number each generation.
971
A. Synapsis
B. Cytokinesis
C. Karyokinesis
D. Apoptosis
Answer: Synapsis is the pairing of homologous chromosomes that occurs during prophase I of meiosis.
972
A. Sister chromatids of the same chromosome
B. Homologous chromosomes
C. Somatic cells
D. Non-dividing cells
Answer: Crossing over involves the exchange of segments between non-sister chromatids of homologous chromosomes.
973
A. Prophase I
B. Anaphase II
C. Telophase I
D. Metaphase II
Answer: Homologous chromosomes pair up (synapsis) during prophase I of meiosis.
974
A. Prophase I
B. Anaphase I
C. Metaphase II
D. Telophase II
Answer: Crossing over occurs during prophase I when homologous chromosomes are paired.
975
A. Leptotene
B. Pachytene
C. Diakinesis
D. Telophase
Answer: Crossing over occurs during the pachytene substage of prophase I, when chromosomes are fully paired.
976
A. Two homologous chromosomes
B. Four homologous chromosomes
C. One chromosome
D. Two sister chromatids
Answer: A tetrad is the group of two homologous chromosomes, each with two chromatids, formed during synapsis.
977
A. 2
B. 4
C. 8
D. 1
Answer: A tetrad consists of two homologous chromosomes with two chromatids each, making four chromatids.
978
A. Anaphase I
B. Anaphase II
C. Metaphase II
D. Telophase II
Answer: In anaphase I, homologous chromosomes separate from each other and move to opposite poles.
979
A. keeping the chromosome number constant
B. reducing the chromosome number by half
C. doubling the chromosome number
D. forming the cell plate
Answer: As homologous chromosomes separate in anaphase I, each pole receives one set (n), halving the chromosome number.
980
A. Prophase I
B. Anaphase II
C. Metaphase II
D. Telophase I
Answer: The synaptonemal complex is a protein structure that forms between paired homologous chromosomes during prophase I.
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