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Our Environment

Question

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Explain the meaning of sexually transmitted diseases (STDs). Give two examples of STDs each, caused due to
(i) bacterial infection and (ii) viral infection. State in brief how the spread of such diseases may be prevented.

Solution

Sexually Transmitted Diseases are infections that are commonly spread by sexual intercourse.

Examples of STDs spread because of

(i) Bacterial infection are - Gonorrhoea and Syphilis.

(ii) Viral infection are- AIDS and Warts.

The spread of such diseases may be prevented by the use of contraceptive methods such as condom.

Some More Questions From Our Environment Chapter

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.

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.

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