Forum

Our Environment

Accumulation of non-biodegradable pesticides in the food chain in increasing amount at each higher trophic level is known as
(a) eutrophication
(b) pollution
(c) biomagnification
(d) accumulation

07/11/2024

Science

10th

Our Environment

In the given food chain, suppose the amount of energy at fourth trophic level is 5 kJ, what will be the energy available at the
producer level?
Grass → Grasshopper → Frog → Snake → Hawk
(a) 5 k J
(b) 50 k J
(c) 500 k J
(d) 5000 k J

07/11/2024

Science

10th

Our Environment

An ecosystem includes
(a) all living organisms
(b) non-living objects
(c) both living organisms and non-living objects
(d) sometimes living organisms and sometimes non-living objects

07/11/2024

Science

10th

Our Environment

In a food chain, the third trophic level is always occupied by
(a) carnivores
(b) herbivores
(c) decomposers
(d) producers

07/11/2024

Science

10th

Our Environment

Which one of the following is an artificial ecosystem?
(a) Pond
(b) Crop field
(c) Lake
(d) Forest

07/11/2024

Science

10th

Sources of Energy

What is biomass? Explain the principle and working of a biogas plant using a labelled schematic diagram.

07/11/2024

Science

10th

Sources of Energy

Energy from various sources is considered to have been derived from the sun. Do you agree? Justify your answer.

07/11/2024

Science

10th

Sources of Energy

What are the environmental consequences of using fossil fuels? Suggest the steps to minimise the pollution caused by various sources of energy including non-conventional sources of energy.

07/11/2024

Science

10th

Sources of Energy

Why is there a need for harnessing non-conventional sources of energy? How can energy be harnessed from the sea in different ways?

07/11/2024

Science

10th

Sources of Energy

Make a list of conventional and non-conventional sources of energy. Give a brief description of harnessing one non- conventional source of energy.

07/11/2024

Science

10th