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What is an ecosystem?
An ecosystem is a place where biotic and abiotic organisms of various communities interact with each other. For example, a garden is an ecosystem which consists of Ponds, plants, grasslands, insects, water, soil etc.
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State the basic requirement for sexual reproduction? Write the importance of such reproductions in nature.
The basic requirements for sexual reproduction:
Sexual reproduction involves fusion of male and female gametes coming from both the parents. In the sexual reproduction, a new individual is formed by the fusion of two haploid gametes, one from the male parent and the other from the female parent.
The importance of sexual reproduction:
(i) The Combination of DNA from two different individuals lead to increase in genetic variation in the offsprings.
(ii) This leads to diversity in the population which helps in natural selection.
| Acquired Traits | Inherited Traits |
| Traits developed during lifetime. | Traits present since the birth. |
| Cannot be inherited that does not pass to the offsprings | Are inherited by the offsprings. |
| Not in the genes. for eg behaviour, the art of playing an instrument | In the genes. For example hair colour, height. |
Explain with the help of an example each, how the following provides evidence in favour of evolution:
Homologous organs
The organs with same structural design and origin but different functions are called. homologous organs
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Mock Test Series
