Question

Besides leucoplasts, starch grains can develop in
A) Chromoplast
B) Lysosome
C) Mitochondria
D) None of the above

Answer 1

Hint:Starch grains are tiny structures made by most plants as products of photosynthesis. Trying to find out the organelle which performs photosynthesis may help in getting the correct answer.

Complete answer:
For us to understand the relation of starch grains with leucoplast we need to understand the concept of plastids.
1) Plastids is a double membrane-bound organelle involved in the synthesis and storage of food, commonly found within the cells of photosynthetic plants.They are necessary for photosynthesis and food storage. A plastid containing green pigment (chlorophyll) is called chloroplast whereas a plastid containing pigments apart from green is called a chromoplast. A plastid that lacks pigments is called a leucoplast and is involved mainly in food storage.
2) Chromoplasts are plastids that are coloured due to the pigments that are produced and stored inside them. They are found in fruits, flowers, roots, and leaves. Colour of these plant organs is associated with the presence of pigments.The glucose which is not used up in the metabolic activities is stored in the stroma of the chloroplast in the form of starch grains.
3) Lysosome is an organelle that is responsible for the digestion of macromolecules, old cell parts, and microorganisms. It digests them with digestive enzymes.
3) Mitochondria are membrane-bound organelles found in the cytoplasm of almost all eukaryotic cells, the primary function of which is to generate large quantities of energy in the form of adenosine triphosphate (ATP).
As we can see, the starch grains are stored in Chromoplasts in addition to the leucoplasts.

Thus, the correct answer is option A (Chromoplast).

Note:Some plant roots and embryos, in the form of seeds and fruit, also serve as storage units for starch. Cells in plant leaves produce starch in the presence of sunlight.