Biology problems
- 1. When more than 20% of the body weight is due to fat, the person is suffering from
Options- A. Marasmus
- B. Kwashiorkor
- C. Scurvy
- D. Obesity Discuss
Correct Answer: Obesity
- 2. The major centre to receive, analyze and integrate information in body is
Options- A. Heart
- B. Kidney
- C. Pituitary
- D. Brain Discuss
Correct Answer: Brain
- 3. Green pigment is called
Options- A. Chlorophyll
- B. Xanthophyll
- C. Carotene
- D. Phycobillin Discuss
Correct Answer: Chlorophyll
- 4. How many pints of blood in the human body?
Options- A. 6 - 8
- B. 10 - 12
- C. 8 - 10
- D. 5 - 7 Also asked in: AIEEE, Bank Exams, Analyst, Bank Clerk, Bank PO
Correct Answer: 10 - 12
Explanation:
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.
- 5. Biological control is to check growth of
Options- A. plants
- B. animals
- C. weeds
- D. one pest by another Discuss
Correct Answer: one pest by another
Explanation:
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.
- 6. AIDS is caused by the organisms which are
Options- A. bacteria
- B. fungi
- C. viruses (HTLV III)
- D. ProtoZoa Discuss
Correct Answer: viruses (HTLV III)
Explanation:
AIDS: The term means Acquired Immunity Deficiency Synodrome. The virus attacks the T cells of the (white corpuscle type) blood and destroys them.
- 7. Oparin is known for his hypothesis on
Options- A. origin of species
- B. origin of life
- C. one germ one disease
- D. one gene one enzyme Discuss
Correct Answer: origin of life
Explanation:
A. J . Oparin was the first to propose the origin of life from inorganic chemical atoms like Oxygen, Hydrogen, Nitrogen and Carbon.
- 8. The disease Goitre is caused in persons who do not have in their diet sufficient
Options- A. calcium
- B. sodium
- C. iodine
- D. iron Discuss
Correct Answer: iodine
Explanation:
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.
- 9. Plants grow in size because of
Options- A. addition of cells
- B. increase in size of cells
- C. enlargement of cells
- D. elongation of cells Discuss
Correct Answer: addition of cells
Explanation:
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.
- 10. Infection of salivary glands by a virus leads to
Options- A. tetanus
- B. mumps
- C. pyorrhoea
- D. ulcers Discuss
Correct Answer: mumps
Explanation:
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.
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