Advertisements
Advertisements
Questions
Differentiate between the following:
External fertilisation and Internal fertilisation.
Differentiate between internal fertilisation and external fertilisation.
Solution
| 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. |
RELATED QUESTIONS
What is the effect of DNA copying, which is not perfectly accurate, on the reproduction process? How does the amount of DNA remain constant though each new generation is a combination of DNA copies of two individuals?
Oviparous animals give birth to young ones.
Explain how, in sexually reproducing organisms, the number of chromosomes in the progeny is maintained.
Fill in the following blank with suitable word :
The cells involved in sexual reproduction are called .............
Give reason for the following:
The parents and off-springs of organisms reproducing sexually have the same number of chromosomes.
Put a tick mark (✓) against the correct alternative in the following statement:
Which one of the following represents the correct sequence in the life history of a butterfly ?
- Egg → Larva → Adult → Pupa
- Egg → Pupa → Adult → Larva
- Egg → Larva → Pupa → Adult
- Egg → Pupa → Larva → Adult
What is the function of uterus?
How is juvenile phase different from reproductive phase?
Explain the formation of the embryo.
Reproduction is essentially a phenomenon that is not for survival of an individual but for the stability of a species. Justify.
