How root modifications have allowed plants to adapt to their environment?

Root modifications have allowed plants to adapt to their environment.

Explanation:

Plants adapt to different habitats and environmental condition by making use of several modification in its parts like roots, stems, leaves etc. The roots always tend to be under the influence of gravity. The growth of plant roots in response to gravity is called geotropism.

Xerophytic plants grow in dry habitats where there is inadequate water supply. Thus the roots of Xerophytic plants grow deeper into the ground to get hold of underground water reserves. Halophytic plants live in salty habitats and thus have to cope up with the high levels of salt.

There are chances of dehydration. In order to prevent this,  the plants maintain a considerably higher amount of solutes in its root cells. This helps the plants to absorb enough water.

the correct answer is - d. china has a large and growing population.

the fact that china has a large (the biggest) population, and it is still growing, doesn't hinder the agriculture production in the country. in fact, it can for increased production in the agriculture, since there's more labor force, as well the sheer mass of people produces lots of scientists that come up with new inventions as to how to improve this sector. nice example is the inner mongolia region in china, in general dominated by the gobi desert, but few scientist came up with a nice idea as to how to make the region productive by using plants that are very resistant to droughts, so lots of people have been employed, and the region is becoming greener and greener each year, and the production of food in this region is also increasing.