Excretion in Animals
Excretion in Animals: Overview
This Topic covers sub-topics such as Homeostasis, Excretion, Excretory Products and Their Elimination and, Osmoregulation
Important Questions on Excretion in Animals
Consider the following four statements (a-d) about certain desert animals such as kangaroo, rat.
(a) They have dark colour and high rate of reproduction and excrete solid urine
(b) They do not drink water, breathe at a slow rate to conserve water and have their body covered with thick hair
(c) They feed on dry seeds and do not require drinking water
(d) They excrete very concentrated urine and do not use water to regulate body temperature.
Which two of the above statements for such animals are true?
A patient suffering from cholera is given saline drip because
Ammonia produced by metabolism is converted into in the liver of mammals and released into which is filtered and out by kidney.
| Substance | Glomerular Filtrate |
Reabsorbed | Urine |
| Proteins | |||
| Glucose | |||
| Urea | |||
| Creatinine |
(1) Glucose is completely reabsorbed
(2) Urea is partially reabsorbed
(3) Proteins are secreted into urine
(4) Creatinine is secreted into urine
Which of the following options, in view of above statements is correct?
In an average, ..... of urea is excreted out per day.
An adult human excretes how much urine per day?
The animal which retains urea for hypertonicity is (most appropriate)
Select the correct statement from the following.
(A) In many invertebrates, the excretory structures are in complex tubular forms.
(B) Vertebrates have simple tubular organ as excretory structure like kidney.
(C) Protonephridia is primarily concerned with excretion.
(D) Protonephridia are excretory structures in rotifers, some annelids and cephalochordates (amphioxus).
Metabolic wastes containing nitrogen in our body are due to
Which of the following excretory product requires maximum water for its elimination?
Select the incorrect statement from the following:
Many freshwater animals cannot live for long in sea water and vice versa mainly because of the
This is not a nitrogenous waste-
Fresh water bony fishes maintain water balance by
The following substances are the excretory products in animals. Choose the least toxic form among them
The osmoregulatory tissue in all animals is:
Osmoregulation is the control over the
Regulation of water and salt balance in the body fluid is called:
Water is NOT reabsorbed in
Which of the following substances are considered as low threshold substances?
