[1 Mark Questions]

Question 1011 Mark

Explain the role of decomposers in the environment?

Answer

Decomposers break down the dead and decaying organic matter and return the nutrients to the soil. Thus, they play a very important role in the nutrient re-cycling in the environment. They also clean the environment by removal of the dead matter.

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Question 1021 Mark

If 5 joules of energy is available at producer level (plants), then how much energy will be transferred to the lion in the following food chain? If 5 joules of energy is available at producer level (plants), then how much energy will be transferred to the lion in the following food chain? Plants → Goat → Lion

Answer

0.05J.

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Question 1031 Mark

Write one negative effect of affluent lifestyle of few persons on the environment.

Answer

Affluent lifestyle increases the consumption of various natural rcsources For example, if every member of family has his own vehicle then the consumption of fuel (petrol, diesel) increases. Exploitation and over-consumption of resources in this manner will lead to their scarcity.

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Question 1041 Mark

A student went to study a local pond. In one part of the pond she noticed tadpoles scraping at some pond weed. In another part she saw a water beetle holding a tadpole in its jaws.A student went to study a local pond. In one part of the pond she noticed tadpoles scraping at some pond weed. In another part she saw a water beetle holding a tadpole in its jaws.
Construct a food chain for the pond.
How many links are there in this chain?

Answer

Weed Tadpole Water beetle.
Three.

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Question 1051 Mark

Arrange the following in a food chain:
Fish, Algae, Small animals, Big Fish.

Answer

$\text{Algae}\ \ \ \ \ \ \ \xrightarrow{\ \ \ \ \ \ \ \ \ }\ \ \ \ \ \ \ \text{Fish}\ \ \ \ \ \ \ \xrightarrow{\ \ \ \ \ \ \ \ \ }\ \ \ \ \ \ \ \text{Big fish}\ \ \ \ \ \ \ \xrightarrow{\ \ \ \ \ \ \ \ \ }\ \ \ \ \ \ \ \text{Small animals}\\^\text{(Phytoplankton)}\ \ \ \ ^\text{(Zooplankton)}\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ ^\text{(Carnivore)}\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ ^\text{(Large carnivore)}\\^\text{(Producer)}\ \ \ \ \ \ \ \ \ \ \ \ ^\text{(Harbivore)}$

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Question 1061 Mark

Suggest one word for each of the following statements/ definitions:
The physical factors like temperature, rainfall, wind and soil of an ecosystem.

Answer

Abiotic factors.

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Question 1071 Mark

Which layer is found above ozone layer of the atmosphere? Mention one characteristic feature of this layer.

Answer

Mesosphere is found above ozone layer of the atmosphere. It extends upward to a height of about 85km (53 miles) above our planet. Most meteors burn up in the mesosphere. Unlike the stratosphere, temperatures once again grow colder as you rise up through the mesosphere.

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Question 1081 Mark

In the following food chain, plants provide 500 J of energy to rats. How much energy will be available to hawks from snakes?
Plants → Rats → Snakes → Hawks

Answer

Energy available to the rats is 500J.
Obeying the 10% law,
Energy available to the snakes will be $\frac{10}{100}\times500\text{j}=50\text{j}$
Energy available to the hawks will be $\frac{10}{100}\times50\text{j}=5\text{j}$

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Question 1091 Mark

Suggest one word for each of the following statements/ definitions:
Organisms which depend on the producers either directly or indirectly for food.

Answer

Consumers (also heterotrophs).

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Question 1101 Mark

'Man is only a consumer'. Justify the statement.

Answer

Yes, human are the consumers which consumes food from nature and plants are the producers.

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Science [1 Mark Questions]