A plant grows in soil contaminated with toxins. Through which structure word the toxins first enter the plant?

A. Paramecium

B. Chloroplasts

C. Phloem

D. Xylem

The correct answer is option D. xylem.

Explanation:

Xylem is the transport tissue like phloem in the vascular plants, Xylem plays a role in transporting water and other nutrients from the soil through roots to different parts of the plants.

So, if any soil contaminant or pollutant act present in the soil it can only enter through xylem as xylem conduct transportation of water and other nutrients from the soil to the parts of the plant. It can be dissolved too.

Thus, the correct answer is option D. Xylem

I'm pretty sure the answer is D. Xylem