NEET BIOLOGY

Detailed explanation-1: -Chloroplasts are found only in plants and photosynthetic algae. (Humans and other animals do not have chloroplasts.) The chloroplast’s job is to carry out a process called photosynthesis.

Detailed explanation-2: -Root cells do not contain chloroplasts because in most plants the roots are underground and not exposed to light. Chloroplasts are needed for photosynthesis, which needs light to occur.

Detailed explanation-3: -In plants, chloroplasts are concentrated particularly in the parenchyma cells of the leaf mesophyll (the internal cell layers of a leaf).

Detailed explanation-4: -Remember, like the mitochondria, chloroplasts also comprise their own DNA. Note that, there are some of the climbers like Tinospora which have photosynthetic or assimilatory roots and the chloroplasts are present in their cortical cells. Roots which can carry out photosynthesis are termed as photosynthetic roots.

Detailed explanation-5: -One would not expect to find chloroplasts in the cells that make up the plant’s roots because chloroplasts function for the process of photosynthesis, which requires sunlight. Since the roots of a plant don’t receive any sunlight, the cells that make up the roots don’t have chloroplasts.