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प्रश्न
Aquatic animals in which fertilisation occurs in water are said to be
विकल्प
viviparous without fertilisation
oviparous with external fertilisation
viviparous with internal fertilisation
oviparous with internal fertilisation
उत्तर
oviparous with external fertilisation
Explanation -
The aquatic animals in which fertilisation occurs in water are oviparous with external fertilisation. They lay eggs and release sperms outside body in the water for fertilisation to take place. The young one top is formed outside the body in water from the zygote formed inside eggs.
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संबंधित प्रश्न
Draw a diagram of the microscopic structure of human sperm. Label the following parts in it and write their functions
(a) Acrosome
(b) Nucleus
(c) Middle piece
Answer the following questions in short.
Which precautions will you follow to maintain the reproductive health?
Give scientific reason.
There is a menopause when women are 45-50 years old.
Describe the structure of the human ovum with a neat labelled diagram.
During spermatogenesis, spermatogonium grows in size to become ______.
First meiotic division is observed in ____________.
______ undergoes 2nd meiotic division during spermatogenesis.
Head of epididymis is called as ______.
Given below are two statements.
- Statement I: The spermatids are non-motile and non-functional which get transformed into functional spermatozoa by the process of spermiogenesis.
- Statement II: During the process of this change, the spermatids remain held to each other and to Leydig's cells by cytoplasmic bridges.
In light of the above statements, select the correct answer from the option given below.
What is spermatogenesis?
