MEDIUM
10th CBSE
IMPORTANT
Earn 100

Answer the following question based on the given information:

Hydrogen gas is an excellent fuel. It has a high calorific value and produces only water as a product of combustion. It is considered to be a potentially important, non-polluting energy source of the future. 
Hydrogen is labelled with different 'colours' based on the method by which it is produced, as given below:
- green hydrogen: manufacturing process does not produce carbon dioxide. 
- blue hydrogen: The manufacturing process produces carbon dioxide but is separated and stored. 
- grey hydrogen: Manufacturing processes produce carbon dioxide, which is released into the air. 

Hydrogen is labelled' brown' if the manufacturing process releases both carbon dioxide and carbon monoxide into the air. 
In what way is a manufacturing process of brown hydrogen WORSE than that of grey hydrogen for the environment? 

50% studentsanswered this correctly

Important Questions on Our Environment

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:

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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
MEDIUM
10th CBSE
IMPORTANT
Mention two ways by which energy is lost from the trophic levels in the ecosystem.
HARD
10th CBSE
IMPORTANT
A lot of harmful chemicals enter our body through different sources like food. Since human beings are at top of the food chain/ trophic structure, maximum concentration of these chemicals is found in human beings. What is this phenomenon known as?
MEDIUM
10th CBSE
IMPORTANT
Lions have no known natural predators. 
Based on energy transfer in a food chain, what could be the most likely reason for the above statement?