Division of cells during the early embryo stages is known as cleavage in embryology. Fertilization is followed by cleavage. The various cells as an outcome of the cleavage are blastomeres, forming a huge ball-like structure; this mass is known as a morula. The end product of the cleavage is blastula. Here are some important MCQs on the topic cleavage biology.
1. This is also known as meroblastic cleavage
(a) Partial
(b) Unequal holoblastic
(c) Equal holoblastic
(d) Superficial
Answer: (a)
2. The type of cleavage found in insects
(a) Holoblastic
(b) Discoidal
(c) Superficial
(d) Meroblastic
Answer: (c)
3. Discoidal and superficial are which types of cleavage?
(a) Unequal holoblastic
(b) equal holoblastic
(c) both (a) and (b)
(d) Meroblastic
Answer: (d)
4. If the first cleavage furrow divides zygote completely into two, the cleavage type is
(a) meroblastic
(b) holoblastic
(c) equatorial
(d) radial
Answer: (b)
5. The only human system that is derived from all the three germ layers is
(a) Nervous system
(b) Digestive system
(c) Respiratory system
(d) Excretory system
Answer: (b)
6. The fertilized egg divides by the process of
(a) Oogenesis
(b) Cleavage
(c) Regeneration
(d) Invagination
Answer: (b)
7. If an unfertilized egg is pricked with a microneedle, it will
(a) transform into a tadpole at a faster rate
(b) die immediately
(c) will remain undivided
(d) start dividing
Answer: (d)
8. A freshly unfertilized egg of hen contains
(a) 10,000 cells
(b) 1,000 cells
(c) 100 cells
(d) one cell
Answer: (d)
9. How many cleavages are completed in the 16-celled stage of an egg?
(a) 12
(b) 8
(c) 4
(d) 3
Answer: (c)
10. The spindle in the determinate cleavage is
(a) Horizontal
(b) Oblique
(c) Vertical
(d) Sub-equatorial
Answer: (b)
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