c) A is true, but R is false.
d) A is false, but R is true.
A. Apical meristem is present at shoot and root tips.
R. It helps in increasing length of the stem and the root.
A. Bohr’s orbits are called stationary orbits.
R. Electrons remain stationary in these orbits for some time.
A In a stretched bow, potential energy is stored.
R. Mechanical energy of a moving body remains conserved.
Q17. Read the following and answer these questions from 17(i) to 17(v)
In addition to the tissue-specific effects of infectious disease, there will be
other common effects too. Most of these common effects depend on the fact
that the body’s immune system is activated is response to infection. In HIV
infection virus goes to immune system and damages its function. The infection
in the body can be spread by direct transmission, e.g. sexual contact, animal
bites, etc or indirect transmission by air, food , vector, etc. Depending upon the
duration of the infectious disease persist grouped into acute, chronic disease.
17. (i) The limitations that are normally confronted while treating an infectious
disease is/are
(a) body functions are impaired and may never recover completely
(b) the patient is confined to bed for some time
(c) infected person serves as a potential source of spread of infectious disease
to other persons.
(d) All of the above
17. (ii) AIDS does not spread through which of the following?
(a) By using syringe used by an AIDS patient
(b) Through contact with clothes of an AIDS patient
(c) Through a mother with AIDS of the foetus during pregnancy
(d) Through breastfeeding by a mother to a child of the mother is suffering
from AIDS.
17. (iii) Making anti-viral drug is more difficult than making anti bacterial
medicine because
(a) virus are on the border line of living and non-living
(b) viruses have very few biochemical mechanism of their own
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