The need for energy, gained by respiration and photosynthesis, is the driving force of the oxygen cycle.

In a way, yes. It can also be said that the driving force of the oxygen cycle is photosynthesis itself, which is responsible for the creation and maintenance of earth's atmosphere.

Photosynthesis occurs in green plants, which use energy  from sunlight to convert carbon dioxide and water into carbohydrates. During this process, water molecules are split and oxygen is released as a by product.

It can thus be said that plants take in or "breathe in" carbon dioxide and release or "breath out" oxygen in to the atmosphere.

The Answer Is T R U E

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.