Fill in the blanks:

a. Next to temperature, $\dots 1\dots$ is the most important factor influencing the life of organisms.

b. Life on Earth originated in $\dots 2\dots$ and is unsustainable without $\dots 2\dots$

c. The productivity and distribution of $\dots 3\dots$ is heavily dependent on water.​​​​​​

d. For aquatic organisms the $\dots 4\dots$ of water becomes important.

The correct option is D $1$-water, $2$-water, $3$ plants, $4$-quality

Blank a

Water is one of the most essential factors required by the living organisms to survive.

After temperature, ...water... is the most important factor influencing the life of organisms.

Blank b

• Origin of life on Earth occurred due to various factors.
• Primitive Earth temperature was very high and the environment was reducing.
• All these led to the formation of biomolecules present in the cell.
• Life on Earth originated in ...water... and is unsustainable without ...water....

Blank c

• The productivity and distribution of ...plants... is heavily dependent on water.
• Plants require water for various purposes.
• Some primitive plants such as algae, bryophytes, and pteridophytes require water for fertilisation without which their life cycle won’t get completed.

Blank d

• Aquatic organisms live in water. The change in temperature, pH, salinity, and amount of dissolved oxygen affects the quality of water.
• For aquatic organisms the ...quality... of water becomes important.

Final answer

(d) $1$-water, $2$-water, $3$ plants, $4$-quality