Q. 143.7( 3 Votes )

Ritu learned that excretion removes harmful metabolic wastes, i.e. nitrogenous wastes from the body. Different processes are employed in varied organisms depending on body’s organisation.

Read the passage and answer the following questions.

(i) Why can’t diffusion be carried out as excretory process in multicellular organisms?

(ii) Aquatic animals usually excrete ammonia as excretory waste. Give reason.

(iii) List the values observed in Ritu.

Answer :

(i) The multi-cellular organisms have a very complex body organization. They possess many different organ-systems to perform the basic life processes, such as respiration, excretion, etc. Also, the cells and tissues of these organisms are not in direct contact with the environment. Moreover, diffusion is quite a slow process. So, excretion cannot be performed through diffusion.


(ii) Ammonia is a toxic nitrogenous waste and is highly soluble in water. The removal of ammonia requires a large amount of water. Aquatic animals are ammonotelic as they need not conserve water. The conversion of ammonia into less toxic metabolite (urea, uric acid) is highly energy intensive. Therefore, aquatic animals prefer not to expend energy in conversion of ammonia.


(iii) Ritu possesses a number of values. She seems to be attentive, vigilant, observant and zealous. She has a curiosity for learning.


Rate this question :

How useful is this solution?
We strive to provide quality solutions. Please rate us to serve you better.
Related Videos
Defining Life and Life Processes57 mins
Champ Quiz | Examining the Life Processes43 mins
Transportation in Plants & Animals38 mins
Genius Quiz | Heartless Plant49 mins
Autotrophic Nutrition59 mins
Pumping of Blood43 mins
Champ Quiz | Vital Processes of Life42 mins
Working of Heart49 mins
Champ Quiz | Double Circulation33 mins
Quiz | PISA Practice48 mins
Try our Mini CourseMaster Important Topics in 7 DaysLearn from IITians, NITians, Doctors & Academic Experts
Dedicated counsellor for each student
24X7 Doubt Resolution
Daily Report Card
Detailed Performance Evaluation
view all courses