Biology

211. An adult human normally has –

1. 6 molar teeth
2. 8 molar teeth
3. 10 molar teeth
4. 12 molar teeth

Option “4” is correct
An adult human normally has 12 molar teeth.
212. Plants get water through the roots because of –

1. Elasticity
2. Capillarity
3. Viscosity
4. Photosynthesis

Option “2” is correct
Plants use capillary action to bring water up the roots and stems to the rest of the plant.
213. Which of the following cells secrete insulin?

1. Alpha cells
2. Delta cells
3. Nerve cells
4. Beta cells

Option “4” is correct
Beta cells secrets Insulin.
214. The function of trypsin in the digestive system is to –

1. Breakdown fats
2. Synthesise proteins
3. Breakdown proteins
4. Breakdown carbohydrates

Option “3” is correct
Trypsin is one of the three principal digestive proteinases, the other two being pepsin and chymotrypsin. In the digestive process, trypsin acts with the other protein as to break down dietary protein molecules to their component peptides and amino acids.
215. Which of the following is the hardest substance in the human body?

1. Bon
2. Enamel
3. Dentine
4. Nail

Option “2” is correct
Enamel is the hardest substance in the human body and contains the highest percentage of minerals, 96%, with water and organic material composing the rest.
216. The blood vessel supplying blood to the kidney is the –

1. Renal artery
2. Hepatic artery
3. Pulmonary artery
4. Carotid artery

Option “1” is correct
Renal artery blood vessel supply blood to kidney.
217. Blubber is –

1. a milky secretion of rubber plant
2. a layer of thick fat
3. a device to trap insects by some aquatic
4. fungal infection of rice plants

Option “2” is correct
Blubber is the thick layer of fat that keeps whales and other large swimming mammals warm in the cold water.
218. Which of the following vertebrates lack exoskeleton?

1. Amphibia
2. Mammalia
3. Aves
4. Chondrichthyes

Option “4” is correct
Chondrichthyes is a class that contains the cartilaginous fishes. It lack exoskelton.
219. The disease that is caused by virus is –

1. Typhoid
2. Cholera
3. Common cold
4. Tetanus

Option “3” is correct
A common cold can be caused by different types of viruses.
220. What is Wilting of plants?

1. Removal of leaves by the plants
2. Loss of rigidity of non-woody parts of plants
3. Respiration process in night by the plants
4. Guttation

Option “2” is correct
Wilting of plants is the loss of rigidity of non-woody parts of plants.
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