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Our Environment
Question
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What are the changes seen in girls at the time of puberty?

Answer

The females show development of breasts, darkening of nipples, menstruation and growth of public hair.

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Some More Questions From Our Environment Chapter

Is an offspring exactly similar to its parent? Why or why not?

How are variations important?

What is the importance of DNA copying in reproduction?

Why is variation beneficial to the species but not necessarily for the individual?

Name the methods of asexual reproduction.

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.