Give reasons for the following.
2. Coconut ae light with water resistant covering.
4. Cocklebur has hooks in its seeds.
5. Layering is used raspberry for asexual reproduction.

Dear student,

Please find the answers to your query below.

2. Coconut are light with water resistant covering.

The reason for this is that such a water resistant covering helps in seed dispersal through water, at the same time preventing spoilage due to water , moreover, the lightness helps the seeds to float and on reaching land they can germinate.

4. Cocklebur has hooks in its seeds.

This helps the seeds to adhere to animal skin or human clothing, thereby helping in seed dispersal to distant places. This is also called hitchhiking. 

5. Layering is used in raspberry for asexual reproduction.

Layering is a means of asexual reproduction useful in propagating plants that usually don't undergo sexual reproduction. Here , the lower stem is left attached to the parent plant, bent and covered with soil to allow roots to develop. This is done in raspberry since stems arise closer to the ground and the young plant receives nutrition from parent until its roots are sturdy enough, thereby helping in successful propagation.

Regards  

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