Nutrition in plants MCQ: Introduction & Explanation

Ans: a) Leaves

Explanation: Leaves are known as the food factory of a plant. They have a pigment known as chlorophyll that traps the energy from the sunlight that is used during the process of photosynthesis. This helps in the preparation of food.

Ans: d) Photosynthesis

Explanation: In the process of photosynthesis, carbon dioxide is taken in and oxygen is released. Photosynthesis refers to the process through which the green plants can prepare their food from water and CO2 using the energy that is derived from the sunlight. The process leads to the formation of glucose that acts as food for the plants.

Ans: b) Heterotrophic Nutrition

Explanation: Autotrophic nutrition is seen in plants. Plants do not eat food produced by other organisms. Animals that obtain food from the plants as they cannot produce their own food are known as heterotrophs. Therefore, heterotrophic nutrition involves the use or intake of complex material that is prepared by some other organism. 

Ans: d) All of the above

Explanation: Nutrients in the soil can be replenished through various methods. Manures and fertilizers contain nutrients such as potassium, nitrogen, and phosphorus. Fertilizers help in replenishing the soil that is exhausted with rich organic nutrients. Manure and compost also do the same and reintroduces the nutrients in living organisms in the soil.

Ans: a) Saprophytes

Explanation: saprophytes refer to those plants and animals that live on the dead material and obtain the food nutrients by breaking down the organic matter. 

• Autotrophs are other organisms that produce their own food using carbon dioxide, water, minerals, and light.
• Epiphytes are organisms that grow on another plant's surface and derive their nutrients from the air around them.
• Parasites live in a host organism or on it and receive their food from their host.

Ans: b) Heterotrophs

Explanation: Like all the members of the Animalia Kingdom, man too is a heterotroph. They are either directly or indirectly dependent on plants to obtain their nutrition. These organisms are unable to produce their own food and therefore are dependent on autotrophs like the green plants to fulfil their nutritional requirements.

Ans: a) Leaf

Explanation: A majority of the gaseous exchange in plants takes place through leaves as they have a large number of stomata present on them. They are in direct contact with the air. Stem helps in providing support to the leaves and help in conducting minerals and water to the leaves. The roots are used for the exchange of minerals of water in the soil while the flower is the reproductive organ of the plant. Therefore, the gaseous exchange takes place through the leaf.

Ans: d) Cell Wall

Explanation: The external cell wall present in the plants lie outside the cell membrane and provides structure to the plants.

Ans: c) Pulses

Explanation: Leguminous plants are the ones that produce lentils, beans, and peas.

Ans: b) Insectivorous

Explanation: Insectivorous plants are the ones that follow both the autotrophic as well as a heterotrophic mode of nutrition. These plants derive their nutrients by consuming animals, insects, Arthropoda, and protozoans. They produce energy through photosynthesis. Some of the examples of Insectivorous plants are venus trap, California pitcher plant, drosera capensis, etc.

Ans: c) Cell membrane

Explanation: The cell membrane is the cell organelle responsible for controlling the movement of substances in and out of the cell. The membrane acts as a barrier between the surrounding environment and the cell itself and is present in both the animal and plant cells.