Question

Study the given flow chart regarding some cell organelles present in a cell. Which of the following options is incorrect regarding X, Y and Z?

• A. Organelle X can transform solar energy into chemical energy of carbohydrates.
• B. Enzymes of organelle Y are present in the acrosome of human sperm cell which digest the limiting membrane of ovum during fertilization.
• C. On starvation organelle Z digests stored food contents and other cellular components this process is called as autophagy.
• D. Organelle X can bring about stepwise oxidation of carbohydrates to produce $C{O}_2$ and water.

Answer 1

The correct option is B Enzymes of organelle Y are present in the acrosome of human sperm cell which digest the limiting membrane of ovum during fertilization.

X is double membrane bounded. Y has no membrane. Z has single membrane. Plant chloroplasts are large organelles that are bounded by a double membrane called the chloroplast envelope. Their main role is to conduct photosynthesis, where the photosynthetic pigment chlorophyll captures the energy from sunlight, and stores it in the energy storage molecules ATP and NADPH while freeing oxygen from water. Plant use the ATP and NADPH to make organic molecules from carbon dioxide in a process known as the Calvin cycle. Lysosomes are single membrane bound organelle. Lysosomes contain enzymes that help with digestion. During starvation of the cell, lysosomes digest stored food contents and supply the correct amount of energy for the cell. In the eukaryotic cell, all cell organelles are bound by membranes. Only the prokaryotic cell contains organelles that are not membrane bound. They lack compartmentalization. Hence enzymes of organelle Y cannot be present in the acrosome of human sperm cell.