Question : An ecosystem consists of:

Option 1: producers, consumers and decomposers in a particular area.

Option 2: all the plants and animals of an area.

Option 3: a living community and its environment.

Option 4: carnivorous and herbivorous of an area.

Question : Identify an example of decomposers that are found in the bottom of a pond.

Option 1: Zooplankton

Option 2: Jellyfishes

Option 3: Flagellates

Option 4: Phytoplankton

Question : In a food chain, the solar energy utilized by plants is only?

Option 1: 10 per cent

Option 2: 1 per cent

Option 3: 0.1 per cent

Option 4: 0.01 per cent

Question : Butan-2-ol is a:

Option 1: tertiary alcohol

Option 2: ketone

Option 3: primary alcohol

Option 4: secondary alcohol

Question : If $a^{3}+\frac{1}{a^{3}}=2$, then the value of $\frac{a^{2}+1}{a}$ is ($a$ is a positive number):

Option 1: 1

Option 2: 2

Option 3: 3

Option 4: 4