Question 1

When more than 20% of the body weight is due to fat, the person is suffering from

Accepted Answer

Obesity

Question 2

The major centre to receive, analyze and integrate information in body is

Accepted Answer

Brain

Question 3

Green pigment is called

Accepted Answer

Chlorophyll

Question 4

How many pints of blood in the human body?

Accepted Answer

Scientists estimate the volume of blood in a human body to be approximately 7 percent of body weight. An average adult body with a weight of 150 to 180 pounds will contain approximately 4.7 to 5.5 liters of blood. An average child with a body weight of 80 pounds will have approximately half the amount of blood as an adult. The amount of blood in a human body varies, depending on factors such as age, sex, overall health and even where a person lives. For example, men tend to have more blood than women of comparable size and weight. Interestingly, people who live at high altitudes may have up to two liters of extra blood compared to those who live at lower altitudes. Because the air at higher altitudes has less oxygen, people who live at high altitudes need extra blood to deliver the right amount of oxygen to their lungs. We know that 1 Pint = 0.473 liters Hence, an average amount of blood in the human body = 4.7 - 5.5 lit = 10 - 12 pints.

Question 5

Biological control is to check growth of

Accepted Answer

Biological Control: This method is very effective. One pest is destroyed by another organism. For example the aphids are killed by lady beetle. The prickly pear is eradicted by cochineal insect. Here the advantage is, one does not use harmful chemicals which may get into the host plants.

Question 6

AIDS is caused by the organisms which are

Accepted Answer

AIDS: The term means Acquired Immunity Deficiency Synodrome. The virus attacks the T cells of the (white corpuscle type) blood and destroys them.

Question 7

Oparin is known for his hypothesis on

Accepted Answer

A. J . Oparin was the first to propose the origin of life from inorganic chemical atoms like Oxygen, Hydrogen, Nitrogen and Carbon.

Question 8

The disease Goitre is caused in persons who do not have in their diet sufficient

Accepted Answer

Goitre is characterized by the swelling of the neck region. This is due to the enlargement of the thyroid gland which secretes hormone thyroxine. Thyroxine has iodine as an integral part of it. If there is not sufficient iodine in one's diet, the thyroid gland swells up.

Question 9

Plants grow in size because of

Accepted Answer

Plants grow in size both in height and in grith. Enlargement of cells already present cannot contribute much to the growth. Only addition of more and more cells could increase the size of the plant considerably.

Question 10

Infection of salivary glands by a virus leads to

Accepted Answer

Mumps : This is a swelling caused by information of parotid glands placed in front of our ear region. The inflammation is caused by a virus.

Question 11

Phycology is the branch of botany in which we study about__________

Accepted Answer

Algae

Question 12

Which of the following crops would be preffered for sowing in order to enrich the soil with nitrogen?

Accepted Answer

Gram

Question 13

Which of the following harmone is called the emergency harmone ?

Accepted Answer

Adrenaline

Question 14

Study of inter relationship between living organism and their environment is called _______

Accepted Answer

Ecology

Question 15

What carries Blood away from the Heart?

Accepted Answer

We know that the circulatory system of our body is a loop. The Heart is the pump, the arteries and their smaller branches (arterioles) carry oxygen rich blood all through your body tissues from the heart and the veins and their smaller branches (venules) carry oxygen depleted blood and waste products back to the heart from all the body parts.

Question 16

Where are Enzymes found?

Accepted Answer

Enzymes play an essential role in each living cell of our body. Enzymes are globular proteins that control biological reactions. These are of two types. 1. Intracellular enzymes 2. Extracellular enzymes Intracellular enzymes are found inside the cell. Extracellular enzymes act outside the cell. Enzymes are produced by exocrine glands. Digestive enzymes of diverse specificities are secreted by the salivary glands, stomach, pancreas, and the small intestine.

Question 17

Select the correct statement about the pharynx.

Accepted Answer

The auditory tube drains into the nasopharynx

Question 18

Which structure is common to plant and animal cells?

Accepted Answer

Mitochondria are present in both plant and animal cells.

Question 19

What sugar is found in DNA?

Accepted Answer

DNA - Deoxyribonucleic acid is a type of nucleic acid. The sugar contained in it is called Deoxyribose.

Question 20

Nitrogenous Food is

Accepted Answer

Here the Nitrogenous Food is Proteins. Nitrogenous Food :: The animal body is more than a machine. It requires fuel to enable it not only to work but also to live, even without working. A part of the food eaten must go to maintain the body Nitrogenous food compounds are sometimes classed together under the name of proteins. These may be divided into proteids, gelatinoids, and extractives.

Biology Questions