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Answer :
Final answer:
External fertilization is less reliable due to unpredictable egg and sperm encounters, while vegetative propagation ensures desirable traits in crops. Additionally, sexual reproduction is exemplified by fish reproduction, differentiating it from asexual methods. The disadvantages of asexual reproduction include vulnerability to environmental changes, illustrated by temperature effects.
Explanation:
Disadvantages of External Fertilization
External fertilization occurs when eggs and sperm meet outside the bodies of the parents, often in water. One significant disadvantage of this method is that a meeting of egg and sperm is left by chance (A). Unlike internal fertilization, where the male can directly control the fertilization process, external fertilization often results in a high number of eggs and sperm that never come together. This randomness can lead to lower success rates for fertilization.
Propagation of Crops
A farmer seeking to propagate a good variety of a crop while maintaining all its desirable traits should use B Vegetative propagation. This method involves taking a part of the plant, like a cutting or tuber, to grow a new plant that is genetically identical to the parent, preserving those favored traits.
Examples of Sexual Reproduction
Among the given options, A Fish reproducing its young is a clear example of sexual reproduction. In this process, male and female fish engage in fertilization that combines their genetic material.
Differentiating Reproductive Methods
The key difference between sexual and asexual reproduction is that C Asexual reproduction does not require gametes, while sexual reproduction requires the union of sex cells or gametes to produce offspring with genetic diversity.
Disadvantages of Asexual Reproduction
One of the disadvantages of asexual reproduction is that D extreme temperatures can wipe out entire colonies. Since asexual reproduction results in genetically identical offspring, if conditions become unfavorable, all individuals may be equally vulnerable to extinction.
Asexual Reproduction Example
Among the options regarding asexual reproduction, A Breeders cross different dogs to develop a new breed of dog is NOT an example of asexual reproduction, as breeding involves sexual reproduction to create varied offspring.
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