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- Structure of Ovum MCQ - Practice Questions with Answers
Quick Facts
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12 Questions around this concept.
Solve by difficulty
MEDIUMOoplasm
How many of them are layers of ovum : corona radiata, corpus albicans, zona pellucida, perivitelline membrane, antrum, corpus spongiosum.
What is the function of cortical granules in the mature ovum?
The layer provide vital protein to the ovum is
A diagrammatic section of ovary is given below.Choose the option which correctly identifies Aand B.
Which of the following layers in an antral follicle is acellular?
Choose the incorrect statement from the following:
The membranous cover of the ovum at ovulation is:
Which of the following situations correctly describe the similarity between an angiosperm egg and a human egg?
i. Eggs of both are formed only once in a lifetime
ii. Both the angiosperm egg and human egg are stationary
iii. Both the angiosperm egg and human egg are mobile
iv. Syngamy in both results in the formation of zygote
Choose the correct answer from the options given below:
Concepts Covered - 1
- The mature ovum is released from the ovary in the secondary oocyte stage.
- It is spherical in shape and is almost devoid of yolk, hence alecithal.
- The cytoplasm is called ooplasm, which contains a large nucleus called a germinal vesicle.
- The nucleolus is quite prominent in the nucleus.
- The ovum lacks centrioles.
- The ooplasm is surrounded by the plasma membrane.
- Very small vesicles called cortical granules are present under the plasma membrane.
- Outside the plasma membrane, there is a narrow space called perivitelline space.
- Outer to the perivitelline space, there is a layer of thick and acellular zona pellucida, which is secreted by the follicular cells.
- Outer to the zona pellucida, there is another thick layer of corona radiata, which is secreted by elongated follicular cells.
- There is an animal pole from which the polar bodies extrude.
- The opposite of the animal pole is called the vegetal pole.
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Structure of Ovum
Biology Textbook for Class XII
Page No. : 51
Line : 6
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