Advertisements
Advertisements
प्रश्न
Differentiate between the following:
External fertilisation and Internal fertilisation.
Differentiate between internal fertilisation and external fertilisation.
उत्तर
| External fertilisation | Internal fertilisation | |
| 1. | The fusion of sperm and egg occurs outside the female body in external fertilisation. | The fusion of sperm and egg occurs inside the female body in internal fertilisation. |
| 2. | It needs water or else the gametes will dry out and die. | It does not need water. |
| 3. | Wastage of gametes is higher. | Wastage of gametes is lower. |
| 4. | Mostly frogs (amphibians) and fish show external fertilisation. | Primarily, reptiles, mammals, birds and insects show internal fertilisation. |
संबंधित प्रश्न
In which female reproductive organ does the embryo get embedded?
Differentiate between internal fertilization and external fertilization.
Complete the crossword puzzle using the hints given below.
Across
1. The process of the fusion of the gametes.
6. The type of fertilisation in hen.
7. The term used for bulges observed on the sides of the body of Hydra.
8. Eggs are produced here
Down
2. Sperms are produced in these male reproductive organs.
3. Another term for the fertilised egg.
4. These animals lay eggs.
5. A type of fission in amoeba.
Which species is likely to have better chances of survival - the one reproducing asexually or the one reproducing sexually? Justify your answer.
What is this act of fusion called?
Give reason for the following:
The parents and off-springs of organisms reproducing sexually have the same number of chromosomes.
The correct sequence of organs in the male reproductive system for the transport of sperms is:
(a) testis → vas deferens → urethra
(b) testis → ureter → urethra
(c) testis → urethra → ureter
(d) testis → vas deferens → ureter
One of the following process does not lead to the formation of clones. This is :
(a) fission
(b) fertilisation
(c) fragmentation
(d) tissue culture
______ is the first stage of sexual reproduction.
Explain the formation of the embryo.
