Q18 of 56 Page 1

What does HIV stand for? Is AIDS an infectious disease? List any four modes of spreading AIDS.

The full form of HIV is Human Immune Deficiency Virus.

Yes, AIDS is an infectious disease because it is caused due to a virus.


The modes of spreading of AIDS are:


1. Through unprotected sexual contact with the person who is carrying an AIDS virus.


2. AIDS is transferable from a mother who is infected to her child during pregnancy.


3. AIDS spread through use of infectious needles which are used for injection


4. AIDS can also spread through transfusion of blood which is contaminated with HIV.


More from this chapter

All 56 →
16

What is the principal of reversibility of light? Show that the incident ray of light is parallel to the emergent ray of light when light falls obliquely on a side of a rectangular glass slab.

 17

What eye defect is myopia? Describe with a neat diagram how this defect of vision can be corrected by using a suitable lens.

 19

A team of Indian researches went to Antarctica to study the ozone layer. They confirmed the presence of largest ozone hole over Antarctica and was just short of 27 million sq. km. After few days of their return, one of the scientist developed rushes, burning sensation and other skin problems which the doctor have confirmed as skin cancer.

(a) What may be the cause of cancer just after return from Antarctica?


(b) What do we learn from this incident?


(c) Raghav, a student of your school organizes a poster-making competition on the topic ‘save ozone’. What moral value is shown by Raghav? What other initiatives will you suggest in this regard?

 20

With the help of suitable diagram, explain the various steps of budding in hydra.

Or


What is binary fission in organisms? With the help of suitable diagrams, describe the mode of reproduction in amoeba.