The correct answer is (d). Cloves are dried flower buds of the tropical evergreen tree Syzygium aromaticum (formerly Eugenia caryophyllata). They are used as a spice and have a strong, sweet, and spicy flavor. Cloves are native to the Maluku Islands (also known as the Spice Islands) in Indonesia, but are now grown in many tropical regions around the world.
(a) Nodules of stem are small, round growths that form on the roots of some plants. They are caused by a type of bacteria called Rhizobium, which helps the plant to fix nitrogen from the air.
(b) Nodules of roots are similar to nodules of stem, but they form on the roots of plants instead of the stems. They are also caused by Rhizobium bacteria.
(c) Leaves are the green, flat organs that grow from the stems of plants. They are responsible for photosynthesis, which is the process by which plants use sunlight to convert carbon dioxide and water into glucose and oxygen.