Introduction to Excretion and Modes of Excretion
Introduction to Excretion and Modes of Excretion: Overview
This topic explains the various controlling mechanisms related to excretion process. It briefs on excretory system and the modes of excretion. The regulation of kidney function is also explained here in detail.
Important Questions on Introduction to Excretion and Modes of Excretion
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?
Earthworms are
The organisms that actively regulate their osmotic pressure, independent of the surrounding environment are called osmoconformers.
Write any two differences between osmoregulators and the osmoconformers.
What are Osmoregulators?
The organisms that cannot maintain an internal environment that is isotonic to their external environment are called osmoconformers.
Jellyfish is an example of an osmoconformer.
Give any two examples of osmoconformers.
What is the meaning of osmoconformers?
Scorpion eliminates guanine crystals as excretory waste.
Fishes are guanotelic organisms.
Which of the following organisms exhibits guanotelism.
What is guanotelism? Give an example of an organism that exhibits guanotelism.
What are the different kinds of waste products produced in animals?
Mode of excretion in bony fishes is
Name the excretory product of freshwater fishes.(Ammonia/Urea)
Which is the most toxic excretory product formed in animals? (Ammonia/Methane)
Write a note on Ammonotelism.
Describe excretion. Explain the mechanism of urine formation.
Define excretion. Describe the structure of nephron. Add a note on physiology of urine formation.
