How do Organisms Reproduce? — Science STD 10 — Question

A piece of paper is placed at the focus of a convex lens focussing sunlight. The paper will :

Which of the following can form a virtual image which is always smaller than the object?

The change in focal length of an eye-lens is caused by the action of the:

Which amongst the given radiation is preferred for taking photographs in fog?

In asexual reproduction, two offsprings having the same genetic material and the same body features are called:

The decomposers in an ecosystem:

Accumulation of non-biodegradable pesticides in the food chains in increasing amount at each higher trophic level is known as:

Assertion (A): Colour of copper sulphate solution changes when an iron nail is kept immersed in it.
Reason (R): The colour of copper sulphate solution changes when iron nail is kept immersed in it due to the decomposition reaction taking place between iron and copper leading to formation of iron sulphate.

Which of the following is a non-renewable source of energy?