Biology SECTION H

1.   The pH of fresh milk is 6. When it turn sour, the pH

(a)    Becomes < 6

(b)   Remain the same , i.e. 6

(c)    Becomes > 6

(d)   Becomes neutral i.e. 7

2.   What is the most conspicuous salient feature of people with ‘progeria?

(a)    More hairs on body

(b)   Less immunity to opportunistic infections

(c)    Faster rate of ageing

(d)   Suffer from  infertility

3.   Which one among the following hormones stimulates the plant cells to grow in a manner such that the plant appears to be bent towards light?

(a)    Cytokinin

(b)   Auxin

(c)    Gibberelin

(d)   Abscisic acid

4.   Consider the following kinds of organisms

1.       Bat     2. Bee    3. Bird

Which of the above is/ are pollinating agent / agents?

(a)    1 and 2

(b)   Only 2

(c)    1 and 3

(d)   All of these

5.    Which one among the following minerals is essential for the transmission of nerve impulses in the nerve fibres of human body?

(a)    Calcium

(b)   Cobalt

(c)    Iodine

(d)   Sodium

6.   The gastrointestinal hormones bamely secretin and cholecystokin secreted by duodenal epithelium activate respectively. Which organs to discharge their secretions?

(a)    Pancreas and gall bladder

(b)   Gall bladder and stomach

(c)    Pancreas and stomach

(d)   Stomach and  small intestine

7.   Magnetic resonance imaging (MRI) is used in medical diagnosis to obtain images our internal body organs. This is primarily possible because

(a)    Our body possess a permanent magnet

(b)   MRI uses an external magnet to generate a magnetic field in our body

(c)    MRI uses an external electric field to generate magnetic field in our body

(d)   Ions motions along our nerve cells generates magnetic field.

8.   Consider the given statements.

1.       Warm- blooded animals can remain active in cold environment in which hcold0nloded animals can hardly move

2.       Cold –blooded animals require much less energy to survive than warm- blooded animals.

Which of the statements given above is/ are correct?

(a)    Only 1

(b)   Only 2

(c)    Both 1 and 2

(d)   Neither 1 nor 2

9.    Which of the following is/ are produced as a result of photosynthesis is in green plants in addition to carbohydrate?

(a)    Carbon dioxide only

(b)   Oxygen only

(c)    Water and oxygen

(d)   Water and carbon dioxide

10.   Cancer is more common in older people because

(a)    Their immune systems have degenerated

(b)   The  supply of certain hormones declines with age

(c)    Their bodies are unable to adjust to the changing environment

(d)   They have accumulated more mutations

Answer:

1.       B

2.       C

3.       D

4.       D

5.       D

6.       A

7.       C

8.       C

9.       B

10.   D