Exercise

Author:NCERT

NCERT Science Solutions for Exercise

Simple step-by-step solutions to Exercise questions of Our Environment from Science Textbook of Competency Based Questions for Class X. Also get 3D topic explainers, cheat sheets, and unlimited doubts solving on EMBIBE.

Questions from Exercise with Hints & Solutions

MEDIUM
10th CBSE
IMPORTANT

Many processes happen in the bodies of living organisms. 
Those processes which involve the building up of complex molecules from simple ones are called anabolism. Those which involved the breakdown of complex molecules into simple ones are called catabolism. 

Which of the following life processes can be considered as an example of anabolism?

HARD
10th CBSE
IMPORTANT

Which of the following option shows the correct products of anaerobic respiration in humans and in yeast?

MEDIUM
10th CBSE
IMPORTANT

Which of these will reduce if compost is used in place of inorganic fertiliser in farms?

MEDIUM
10th CBSE
IMPORTANT

What is the ratio of average amount of energy absorbed by the producers to the average amount of energy absorbed by the primary consumers? 

MEDIUM
10th CBSE
IMPORTANT

Which of the following describes of flow of energy and nutrients, respectively, through the ecosystem? 

HARD
10th CBSE
IMPORTANT

Answer the following question based on the information given below: 
Shown here is the extent to which two different animals can see in either direction without turning their heads. In animal 1, the eyes are placed towards the front of the head, and animal 2; the eyes are placed on either side of the head. 
Since the placement of eyes in the two animals is different, their vision is also slightly different. 

Question Image
In the figure above, the grey part represents the part that both eyes can see at a time, while the white part represents those parts that can be seen only by one eye at a time. 
Animal 2 can see a broader area at any time compared to animal 1. Animal 1 can distinguish depth better compared to animal 2. 
Based on this, which of the following two animals is most likely to be a Predator and why?

HARD
10th CBSE
IMPORTANT

Answer the following question based on the information given below: 
Shown here is the extent to which two different animals can see in either direction without turning their heads. In animal 1, the eyes are placed towards the front of the head, and animal 2; the eyes are placed on either side of the head. 
Since the placement of eyes in the two animals is different, their vision is also slightly different. 

Question Image
In the figure above, the grey part represents the part that both eyes can see at a time, while the white part represents those parts that can be seen only by one eye at a time. 
Animal 2 can see a broader area at any time compared to animal 1. Animal 1 can distinguish depth better compared to animal 2. 

Observe the following food web. Classify the animals into two groups - one that would need to have a vision as animal 1 and another as animal 2 in the diagram above:

Question Image

HARD
10th CBSE
IMPORTANT

Arrange the four objects given above according to the time they take to get biodegraded(LEAST time TO MOST time).

Bone Metal can Paper sheet Plastic bottle