In a cereal grain, the single cotyledon of the embryo is represented by:

The majority of carbon dioxide produced by our body cells is transported to the lungs:

Triticale, the first man-made cereal crop, has been obtained by crossing wheat with:

1. rye

2. pearl millet

3. sugarcane

4. barley

In order to obtain virus-free plants through tissue culture the best method is:

1. protoplast culture

2. embryo rescue

3. anther culture

4. meristem culture

HIV that causes AIDS first starts destroying:

1. B-lymphocytes

2. leucocytes

3. thrombocytes

4. helper T-lymphocytes

In which one of the following sets of animals do all four give birth to young ones?

1. Lion, bat, whale, ostrich

2. Platypus, penguin, bat, hippopotamus

3. Shrew, bat, cat, kiwi

4. Kangaroo, hedgehog, dolphin, loris

Sickle cell anaemia has not been eliminated from the African population because:

1. It is controlled by recessive genes

2. It is not a fatal disease

3. It provides immunity against malaria

4. It is controlled by dominant genes

Two common characteristics found in centipedes, cockroaches, and crabs are:

1. compound eyes and anal cerci

2. joined legs and chitinous exoskeleton

3. green gland and tracheae

4. book lungs and antennae

Both sickle cell anaemia and Huntington’s chorea are:

1. bacteria-related diseases.

2. congenital disorders

3. pollutant-induced disorders

4. virus-related diseases

Angiotensinogen is a protein produced and secreted by:

1. macula densa cells

2. endothelial cells (cells lining the blood vessels)

3. liver cells

4. juxtaglomerular (JG) cells