3
Question
The growth of pollen tubes towards ovules is due to
The growth of pollen tubes towards ovules is due to
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Solution
The correct option is A Chemotropism
Chemotropism is the growth of organisms such as bacteria and plants, with the help of a chemical stimulus from outside of the organism or from organism's part. The response of the organism is termed 'positive' if the growth is towards the stimulus or 'negative' if the growth is away from the stimulus. An example of chemotropic movement can be seen during the growth of the pollen tube, where growth is always towards the ovules. Fertilization of flowers by pollen is achieved because the ovary release chemicals that produce a positive chemotropic response from the developing pollen tube. Therefore, the correct answer is option B.
Chemotropism is the growth of organisms such as bacteria and plants, with the help of a chemical stimulus from outside of the organism or from organism's part. The response of the organism is termed 'positive' if the growth is towards the stimulus or 'negative' if the growth is away from the stimulus. An example of chemotropic movement can be seen during the growth of the pollen tube, where growth is always towards the ovules. Fertilization of flowers by pollen is achieved because the ovary release chemicals that produce a positive chemotropic response from the developing pollen tube. Therefore, the correct answer is option B.
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