Excretory Products and Their Elimination

Q.

What is an excretory organ in a cockroach?

Q.

What is the excretory organ of cockroach?

Q. Choose the correct sequence :

1. carbamoyl phosphate - citrulline - arginine & fumarate - urea & ornithine
2. carbamoyl phosphate - citrulline - urea & ornithine - arginine & fumarate
3. arginine & fumarate - carbamoyl phosphate - citrulline - urea & ornithine
4. arginine & fumarate - citrulline - urea & ornithine - carbamoyl phosphate

Q. The process by which organisms maintain a constant internal environment is:

1. thermoregulation
2. hemostasis
3. homeostasis
4. osmoregulation

Q. Crustaceans such as prawns use as excretory organs.

1. spiracles
2. nephridia
3. protonephridia
4. green glands

Q. Ammonia in the body increases the of the body.

1. temperature
2. pressure
3. pH
4. blood pressure

Q. Ammonia in the body increases the of the body.

1. temperature
2. pressure
3. pH
4. blood pressure

Q. Urea cycle converts ammonia into

1. more toxic form
2. less toxic form
3. either less or more toxic form
4. a product with the same toxicity as ammonia.

Q. A terrestrial animal must be able to:

1. Conserver water
2. Actively pump salts out through the skin
3. Excrete large amounts of salts in urine
4. Excrete large amounts os water in urine

Q. The following are the excretory products in animals. Choose the least toxic nitrogenous excretory product from the following.

1. Urea
2. Uric acid
3. Ammonia
4. Carbon dioxide

Q. Which of the following statement/statements are not true according to urea cycle?
I. Two ATP molecules are required for synthesis of carbamoyl phosphate.
II. Products of urea cycle are: 1 molecule of urea, 2 molecules of ADP, 1 molecule each of AMP and fumaric acid.
III. Urea cycle takes place in kidney cells.
IV. Reaction of citrulline and aspartate requires ATP.

1. I, III, and IV only
2. I and III only
3. I, II, and IV only
4. III only