Multiple choice questions answers in Biology

1. In a human being, the organ of the body which carries out most of the digestion is the? Your Answer: Small Intestine In human beings, most digestion takes place in the small intestines.

2. A concentration of carbon dioxide in the blood stimulates the breathing center in the? Your Answer: Medulla Oblongata The medulla oblongata is the part of the brain which controls breathing and circulation.

3. A compound that is quickly absorbed through the walls of the stomach is? Your Answer: Alcohol Alcohol is one of a very few substances very quickly absorbed after being ingested.

4. Research indicates that cigarette smoking results in which of the following conditions? Your Answer: Cardiovascular Stress Cigarette smoking is generally associated with cardiovascular stress. The other conditions are produced by specific viruses.

5. Which of the following determines the sex of a human? Your Answer: Sperm Cell The sperm cell contains the particular chromosome which determines the sex of a human embryo.

6. Which of the following lacks a backbone? Your Answer: Jellyfish A jellyfish is the only one of the possible choices which is an invertebrate.

7. A family has 7 boys and 1 girl. What is the chance that the next child will be a girl? Your Answer: 50 Percent Since each sperm can carry the X or Y chromosome with equal probability, sex determination for each birth is the same, 50 percent for a boy, and 50 percent for a girl.

8. Grass, (like that in your front yard) is usually pollinated by? Your Answer: Wind The most common form of pollination of grasses is caused by the wind.

9. Which of the following is an antiseptic? Your Answer: Iodine Iodine is an antiseptic, an item used to clean wounds.

10. A knee jerk response to a sharp blow is an example of? Your Answer: Reflex A reflex is an immediate response to a stimulus which takes place without thought or intent.