Question

Sink is related to
(A) Phytochrome
(B) Enzymes
(C) Stomata
(D) Transport of minerals

Answer 1

Hint: Sink is related to that part of the plants which help in the storage of food. Once the food is prepared by photosynthesis, it is stored in parts like rhizome of plant or roots of some plants and get transported to plants when needed.

Complete answer:
Sink is related to the Transport of minerals. When plants require minerals and nutrients, they get transferred from storage parts of the plant to various parts. The part which makes food is defined as a source, whereas the part which stores minerals, specifically food is referred to as sink. The xylem cells of the stem, roots, and leaves are interconnected forming a conducting channel reaching all plant parts. Thus, there's a nonstop water movement into the xylem.

Additional Information: Roots, especially those with attached tubers, or other underground parts like rhizomes or bulbs which are technically a modified stem, are one of the most common places where plants store food. The storage structures are mostly underground because of the reason that due to this the plant gets protection from animals that might eat that nutrient-rich structure, exactly like a carrot or potato, but some plants have modified storage structures above ground also.

Usually, it is seen that the wild plants store some amount of energy and nutrients in their stems, and some in leaves. Even the plants also store significant food in seeds, which act as food for the next generation of plants. The cotyledons are stored food that the young plant will use while it's growing.
So, the correct answer is ‘Transport of minerals’.

Note: It is very interesting to note that some organs act like both a source and a sink. Leaves are sinks when growing and sources when performing photosynthesis. Rhizomes are sinks when growing but become sources in the spring season when they provide energy for the new growth.