Friday, 18 August 2017

Cell
Question 1
Which stages of cell division do the following figures A and B represent respectively?


Fig. A

Fig. B
(1)
Prophase
Anaphase
(2)
Metaphase
Telophase
(3)
Telophase
Metaphase
(4)
Late Anaphase
Prophase
A
1
B
2
C
3
D
4
Question 2
During oogenesis the cell that is fertilized by a sperm to become an egg is
A
primary spermatocyte
B
secondary oocyte
C
primary oocyte
D
secondary spermatocyte
Question 3
A bivalent consists of
A
Two chromatids and one centromere
B
Four chromatids and two centromeres
C
Two chromatids and two centromeres
D
Four chromatids and four centromeres
Question 4
A change in the amount of yolk and its distribution in the egg will affect:
A
Fertilization
B
Formation of zygote
C
Pattern of cleavage
D
Number of blastomeres produced
Question 5
Chromosomes can be counted best at the stage of
A
Metaphase
B
Late anaphase
C
Telophase
D
Late prophase
Question 6
The stage in which daughter chromosomes move toward the poles of the spindle is
A
Anaphase
B
Metaphase
C
Prophase
D
Telophase
Question 7
Chiasmata are first seen in
A
Pachytene
B
Zygotene
C
Leptotene
D
Diplotene
Question 8
Protein subunit found within microtubules is
A
Collagen
B
Tubulin
C
Myosin
D
DNA
Question 9
Balbiani rings occur in
A
Autosome
B
Heterosome
C
Lampbrush chromosome
D
Polytene chromosome
Question 10
Cell plate grows from
A
One wall to another
B
Centre to wall
C
Wall to centre
D
Simultaneously
Question 11
Which of the following cellular structures always disappears during mitosis and meiosis?
A
Plasma membrane
B
Nucleolus and nuclear envelope
C
Plastids
D
none of these
Question 12
Centromere is a constituent of
A
Ribosome
B
ER
C
Chromosome
D
Mitochondrion
Question 13
Chiasma formation occurs in
A
Pachytene
B
Zygotene
C
Leptotene
D
Diplotene
Question 14
Crossing-over results in
A
Recombination of linked alleles
B
Dominance of alleles
C
Segregation of alleles
D
Linkage between genes
Question 15
Cytoplasmic division of a cell is called
A
Cell plate formation
B
Cytokinesis
C
Mitosis
D
Synapsis

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