FREE NEET Biology Practice MCQ Test: Excretory Products And Their Elimination Exercise 1 Questions Answers With Detailed Explanations [PDF]

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Excretory Products And Their Elimination Topic Based

Question : 1

The principal nitrogenous excretory compound in humans is synthesized

Answer: (d)

Question : 2

Which one of the following characteristics is common both in humans and adult frogs?

Answer:(d)

Excretion of urea is known as ureotelism and the animals which excrete urea are called ureotelic. Ureotelic animals include marine fishes, semi-aquatic amphibians such as frogs and toads, aquatic or semiaquatic reptiles like turtles, terrapins and alligators, and man and all other mammals. Urea is less toxic and less soluble in water than ammonia. Hence, it can stay for some time in the body. Amphibian tadpole (e.g., tadpole of frog) excrete ammonia but after metamorphosis, frog excretes urea.

Question : 3

Urine formation mainly involves the process of

Answer: (d)

Question : 4

What will happen if the stretch receptors of the urinary bladder wall are totally removed?

Answer: (c)

Micturition is same as urination. Urination or micturition is the act of passing urine which is a reflex phenomenon. As urine accumulates in bladder the stretch receptors are activated and pass the stimulus to the CNS. In the absence of stretch receptors, the urine would get collected and probably overflow.

Question : 5

Select ammonotelic from the following

Answer: (d)

Question : 6

Refer the following diagram and identify the parts of a kidney indicated.

excretory-products-and-their-class-11-elimination-Chapter-19-neet-mcq-6-427-17

Answer: (d)

Question : 7

Vasa rectae are peritubular capillaries around –

Answer: (c)

Question : 8

Find the incorrect statement regarding mechanism of urine formation in man

Answer: (c)

Question : 9

Excretory and osmoregulatory structure in cockroach is

Answer: (d)

Question : 10

Which of the following sets of animals produce the same substances as their chief excretory product?

Answer: (a)

Frog, monkey and dog, all are ureotelic animals. They excrete their wastes in the form of urea.

Question : 11

Which one of the following is also known as antidiuretic hormone?

Answer: (a)

Question : 12

Assertion :
Kidney maintains the osmotic concentration of the blood.
Reason :
Kidney eliminates either hypotonic or hypertonic urine according to the need of the body.

Answer: (b)

Kidney plays an important role in maintaining the concentration and osmotic pressure of blood. When water intake of an animal is very high, the urine excreted has to be hypotonic and lower in osmotic pressure than their blood in order to remove the excess water. On the contrary, when there is a shortage of water, the urine excreted needs to be hypertonic and higher in osmotic pressure than their blood to reduce the loss of water with urine.

Question : 13

Dialysing unit (artificial kidney) contains a fluid which is almost same as plasma except that it has

Answer: (c)

Dialysis is a process for removing waste and excess water from the blood and is used primarily as an artificial replacement for lost kidney function in people with renal failure. The dialysing unit has the same composition as that of plasma except the nitrogenous waste (urea).

Question : 14

The pH of human urine is approximately

Answer: (c)

The pH of human urine is approximately 6.0.

Question : 15

The excretory organs in prawn are

Answer: (d)

Question : 16

DCT helps in

  1. Conditional reabsorption of $Na^{+}$ and water
  2. $HCO_3^{–}$ absorption
  3. pH maintenance
  4. Selective secretion of $H^{+}$ and $K^{+}$

Answer: (c)

Question : 17

An adult human excretes how much urine per day?

Answer: (b)

Question : 18

Assertion:
Most of the secretion of liver is pass out along with faecal matter.
Reason:
Bile juice is secreted in digestive tract.

Answer: (b)

Question : 19

Kidney crystals are solid clusters of

Answer: (c)

Question : 20

In deficiency of ADH, the rate of micturition

Answer: (a)

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