Our Environment...

In a food chain, the initial organism is usually:

If a grasshopper is eaten by a frog, then the energy transfer will be from:

In the following groups of materials, which group (s) contains only non-biodegradable items?       (i) Wood, paper, leather (ii) Polythene, detergent, PVC (iii) Plastic, detergent, grass (iv) Plastic, Bakelite, DDT

Sahara Desert was formed over a period of time due to one of the following uncontrolled activities of man:

What percentage of sun's energy falling on the leaves of green plants is utilized by the plants in the process of photosynthesis and stored as chemical energy of food?

The flow of energy in an ecosystem is always:

The excessive exposure of humans to ultraviolet rays result in: (i) Damage to immune system (ii) Damage to lungs (iii) Skin cancer (iv) Peptic ulcers

Most of the water surface of a lake is covered with algae. This algae is a part of the food chain which also includes small fish, bird, larvae and big fish. Which of the following will obtain the maximum energy?

If the energy transferred to a tertiary consumer in a food chain is 10 J, how energy was available to the primary consumer?

O₂ is converted into O₃ by the action of: