Excretory Products and Their Elimination

Q.

What are the processes involve in the formation of urine?

Q.

What is the excretory organ of fish?

Q. In breast, the mammary alveoli open into the

1. Mammary duct

2. Mammary tubule

3. Lactiferous duct

4. Mammary ampulla

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

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

Q. Milk secretion is caused by:

1. Progesterone
2. Adrenaline
3. Insulin
4. Oxytocin

Q. Vasa recta in cortical nephrons

1. arises from afferent arteriole rather than efferent arteriole.
2. does not get involved in counter current mechanism with loop of henle.
3. carries deoxygenated blood rich in urea.
4. is absent or highly reduced.

Q. There is no sugar in urine but the blood entering the kidney has more sugar than that leaving the kidney because

1. Sugar is absorbed by proximal convoluted tubule
2. Sugar is used by kidney cells in metabolism
3. Sugar is absorbed in Loop of Henle
4. Sugar is absorbed by bladder

Q. I have a doubt in URECOTELISM process. The concept says that the uric acid is insoluble in water and it requires the least amount of water for excretion. But how is that possible, i can't understand., how an insoluble substance needs less water than ammonia and urea?

Q.

The dorsal side of an earthworm is marked by:

1. dorsal blood vessel

2. clitellum

3. genital pores

4. nerve cord

Q.

Is urea a nitrogenous waste?

Q. A large quantity of fluid is filtered every day by the nephrons in the kidneys. Only about 1% of it is excreted as urine. The remaining 99% of filtrate

1. gets collected in the renal pelvis
2. is lost as sweat
3. is stored in the urinary bladder
4. is reabsorbed into the blood

Q.

The following substances are the excretory products in animals. Choose the least toxic form among them.
(a) Urea (b) Uric acid
(c) Ammonia (d) Carbon dioxide

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.

The characteristic that is shared by urea, uric acid and ammonia are:

I. They are nitrogenous wastes
II. They all need a very large amount of water for excretion
III. They are all equally toxic
IV. They are produced in the kidneys

1. I and IV
2. I, II and IV
3. I and II
4. Only I

Q.

Are Birds Ammonotelic?

Q. The presence of arginase confirms that the

1. Urea cycle is operating
2. Urea cycle may be operating
3. Arginine is being converted into Ornithine
4. Arginine is being converted into citrulline

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.

_________ is the main nitrogenous waste produced in the body.

Q. Which hormones induce secretion of succus entericus : -

1. Insulin
2. Secretin and cholecystokinin
3. Glucagon
4. Secretin

Q.

Guanine is insoluble in water. So it require low water for excretion.

What is the meaning of this line

Q. Two examples in which the nitrogenous wastes are excreted from body in the form of uric acid are

1. Birds and lizards
2. Mammals and mollusc
3. Insects and bony fishes
4. Frogs and cartilagenous fishes

Q.

Tell in detail about ketone bodies found in urine

Q. The following substances are the excretory products in animals. Choose the least toxic form among them.

1. Urea
2. Uric acid
3. Ammonia
4. Both b and c

Q. Why is excretion necessary? Name the common excretory substances in our body.

Q. Terrestrial animals are generally either ureotelic or uricotelic, not ammonotelic. Why ?

Q. Which of the following pairs is uricotelic?

1. Cat and kite
2. Kite and lizard
3. Camel and eagle
4. Lizard and camel

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.

What kind of waste do human produce?

Q. Malpighian tubules are the excretory organs in

1. Platyhelminthes
2. Ascaris
3. Pila
4. Cockroach

Q.

Why is human excretion necessary?