Which of the following statement(s) about Acquired Immuno Deficiency Syndrome (AIDS) is/are correct?
1. AIDS is a congenital disease caused by a retrovirus known as Human Immuno deficiency Virus (HIV).
2. AIDS is characterised by a progressive decrease in the number of T-lymphocytes in the body of the infected person.
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Desirable characteristics of a crop variety helps in easy adoption of that crop by the farmers. In this context, consider the following statements:
1. Incorporating desirable characters into crop varieties can be done through fertilisation.
2. Dwarfness is desired in cereals, so that less nutrients are consumed by these crops.
3. Hybridisation refers to crossing between genetically similar plants.
Which of the statement(s) given above is/are correct?
Read the following statements carefully:
1. Motion of the moon around the earth.
2. Tides in open seas.
3. Rotation of earth.
4. Motion of planets around the Sun.
Which of the events given above are result of force of ‘Gravitation’?
Vaccines are now available for preventing a whole range of infectious diseases. Which among the following infectious diseases are preventable by the use of vaccine?
1. Polio
2. Measles
3. Whooping cough
4. Human Papilloma Virus (HPV)
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Which among the following are the characteristic features of birds?
1. They are cold-blooded animals.
2. They lay eggs.
3. Two forelimbs are modified for flight.
4. They breathe through lungs.
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Read the following statements carefully in the context of ‘particulate pollutants’?
1. Smoke particulates consist of gaseous or mixture of gaseous and liquid particles formed during combustion of organic matter.
2. Dust is composed of fine solid particles produced during crushing, grinding and attribution of solid materials.
3. Mists are produced by particles of spray liquids and by condensation of vapours in air.
4. Fumes are generally obtained by the condensation of vapours during sublimation, and boiling.
Which of the statements given above are correct?
With reference to ‘blood’ present in the human body, consider the following statements:
1. It carries oxygen and food to all the cells in human body.
2. It collects wastes from the cells for disposal.
3. It is a type of connective tissue.
Which of the statements given above is/are correct?
Consider the following statements:
1. Anti-viral medicines are harder to make as viruses have biochemical mechanisms of their own.
2. Anti-bacterial medicines target both bacteria and fungi.
Which of the statement(s) given above is/are correct?
If an opaque object on the path of light becomes very small, light has a tendency to bend around it and not walk in a straight line. This effect is known as:
Manure contains large quantities of organic matter and also supplies small quantities of nutrients to the soil. In this context, consider the following statements:
1. The organic matter in manure helps in improving the soil structure.
2. It increases the water holding capacity in sandy soils.
3. It causes water logging in clayey soils.
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The nearest and the farthest points up to which a normal human eye can see objects clearly are between: