The major function of leaves is to

a make food
b store food
c transport
d absorb nutrients

The answer should be A, make food.

A lot of chloroplasts are found in leaves because that is the location where photosynthesis occurs, the process that a plant makes food (glucose) for themselves by using sunlight, carbon dioxide from the atmosphere, and water.

On the other hand, plants usually store food in places such as seeds or underground stems.

Transport should mainly occur in the stem, where there's xylem and phloem. Xylem is for transporting water and mineral ions while phloem is for transporting amino acids or food the plant made from photosynthesis.

Last but not least, nutrients are usually absorbed from the root, by the root hair cells. They absorb water and mineral ions from the soil and are transported to the leaves or anywhere else needed.

1: most common garden plants prefer loam — soils with a balance of different-sized mineral particles (approximately 40% sand, 40% silt, and 20% clay) with ample organic matter and pore space. however, some plants grow better in sandy soils, while others are well-adapted to clay soils.

2: available water capacity is the maximum amount of plant available water a soil can provide. it is an indicator of a soil's ability to retain water and make it sufficiently available for plant use. available water capacity is the water held in soil between its field capacity and permanent wilting point.

3: it is the same for all living things (plants and animals). it also includes very tiny organisms that our eyes cannot see. they are known as microorganisms, and include viruses, bacteria and fungi.