It is a bacterium which lives in the root nodules of leguminous plants like pea and helps in fixing atmospheric nitrogen.

Magnesium is the metallic element present in the chloroplast of plants.

After a crop is harvested, the grains are separated from the chaff by a process called threshing.

ATP molecules store energy which is used for mechanical work. So, they are called 'energy currency of a cell'.

Chromoplast imparts colour to flower and fruits. So, they help in pollination and fruit dispersal.

After harvesting and before raising the next crop, the field lies bare. The wind blows off the top soil at that time. Thus, to prevent the soil from being blown away, the farmers grow cover crops such as grass and creepers.

Petal attracts insects for pollination.

Eutrophication is the process by which a body of water acquires a high concentration of nutrients, especially phosphates and nitrates. Eutrophication is a phenomenon observed in ponds and wells.

Young trees are often grown as houseplants in areas where the winters are too cold for them to grow outside (they will not, for example, survive outdoors in most of the areas of the United States or Europe), and are sometimes used as Christmas trees.

Chloroplast is known as the 'kitchen of the cell' because it is responsible for the preparation of food by photosynthesis.

Clove, the commonly used spice, is obtained from the flower bud.