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Our Environment

Question

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(a) What is fragmentation in organisms? Name a multicellular organism which reproduces by this method.

(b) What is regeneration in organism? Describe regeneration in Planaria with the help of a suitable diagram.

Solution

(a) Diagram of longitudinal section of flower is shown below:

(b) Male reproductive part of the flower is the stamen which consists of filaments and anthers.

The female reproductive part of the flower is the pistil that consists of stigma, style and ovary.

Some More Questions From Our Environment Chapter

Name two organisms which reproduce by (a) budding (6) fragmentation and (c) spore formation.

Why cannot all multicellular organisms divide cell-by-cell like Spirogyra?

How is the problem of dobling of the amount of DNA solved ?

Write names of five plants in which stem is used to produce a new plant.

Give one example of plant which uses leaves for propagation. Draw propagation organ.

List four methods of vegetative propagation which are exploited by man in propagating plants in garden and nurseries.

Write five names of plants which are usually propagated by cutting method.

Name a ornamental plant which is grown by the vegetaive propagation of stem.

What are the different types of asexual reproduction?

Describe the binary and multiple modes of asexual reproduction in organisms.

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