Question

i) How is internal fertilization different from external fertilization. Give an example of each.​

Answer 1

Answer:

Explanation

External fertilization Internal fertilization  

It occurs outside the body of the female.

It occurs inside the body of the female.

A large number of gametes are released into the surrounding medium (e.g., water) where fertilization takes place.

The male gametes are deposited in the body of the female with the help of copulatory organ.

External fertilization requires the presence of water for the sperm to be able to unite with the egg.

With internal fertilization, the presence of water is not needed.

Organisms that use external fertilization to reproduce must either live in the water or return to the water for reproduction.

Animals that have internal fertilization have completely transitioned to life on land.

A Large number of eggs and sperms are needed.  

The number of gametes produced is less.  

Examples: Bony fish, Amphibians, most of the Algae etc.:

Examples: Reptiles, Birds, Mammals, Bryophytes and Tracheophytes (Pteridophytes, Gymnosperms, Angio­sperms), etc.

Answer 2

EXTERNAL FERTILIZATION:

• Takes place outside the female’s body.
• Usually, an outsized variety of gametes square measure free within the encompassing medium (for example water).
• Organisms that use external fertilization to breed should either sleep in the water or come to the water for a replica.
• As the likelihood of fertilization in water is usually less, hence, an outsized variety of gametes square measure free.

Examples: Fish, Amphibians, and most of the protoctist, etc.

INTERNAL FERTILIZATION:

• Takes place within the female’s body.
• Male gametes square measure free within the body of the feminine by a sex organ.  
• The number of gametes created during this mode is comparatively less.

Examples: Reptiles, Birds, Mammals, Bryophytes, and Tracheophytes.