Question

what is necessary for the growth of plant

Answer 1

for the growth of plant we need sunlight, water, soil, oxygen and carbon dioxide.

Answer 2

Fresh, clean air and healthy soil are important for plant growth... Dirty air caused by smoke, gases, and other pollutants can be harmful to plants, limiting their ability to take in carbon dioxide from the air for making food (photosynthesis). It can also block out sunlight, which is also necessary for healthy plant growth.
And in plant hormones...Auxin is responsible for growth