Nutrition in Plants Test - 7

Heterotrophs are the organism which does not prepare their own food. They depend on autotrophs for their nutrition. They derive the nutrition from the host and used to construct the proteins for their body.

There are different methods by which nutrients in the soil can be replenished. Fertilizers and manures contain plant nutrients such as nitrogen, phosphorus, potassium. Fertilizer can be added to the soil. It helps in replenishing exhausted soils with rich sources of organic nutrients. Manure is environment friendly and replenishes the soil with organic nutrients. Compost is decomposed organic material. It reintroduces living organisms and nutrients in the soil. It improves soil structure and provides a healthy environment for plant roots. 

Correct Option: D
Explanation:

• The autotropic mode of nutrition is a process in which an organism produces its own food from raw materials.
• The raw material for photosynthesis is water and carbon dioxide. 
•  This process occurs in presence of sunlight, where chlorophyll which is a green-coloured pigment helps in the formation of oxygen and carbohydrate.
• Hence, in the autotropic mode of nutrition, it requires all of the above.

• Autotrophs are organisms, that can prepare their own food through the process of photosynthesis such as plants.
• Heterotrophs are organisms, that cannot prepare their own food and dependent on other organisms for their nutrition such as humans.
• When an organism is nutritionally dependent on another organism, it is called parasitism. 
• Saprophytes are organisms, that feed on dead organic matter.
• Thus, option A is correct.

The process of taking in CO$$_2$$ by plants and releasing O$$_2$$ is occurs in photosynthesis. Photosynthesis is the process by which green plants prepare their own food from CO$$_2$$ and water using the energy from the sunlight. Glucose is formed in this process which acts as food for the plants. Reaction of photosynthesis is:

• Saprophytes are plants and animals which live on dead material and obtain their nutrients by breaking down organic matter.
• Autotrophs produce their own food using light, water, carbon dioxide and minerals.
• Epiphytes grow on the surface of another plant and derive their moisture and nutrients from the air, rain, water, or from debris accumulating around it. They prepare their own food.
• Parasites live on or in a host organism and get their food from or at the expense of their host.
• So, the correct answer is option D.

A man, like all other members of kingdom Animalia, is heterotrophic and is dependent either directly or indirectly on plants for nutrition. Heterotrophic organisms cannot produce their own food and are dependent on autotrophs such as green plants for their nutritional requirements. 

Autotrophic nutrition is observed in plants. Plants do not eat like animals but use sunlight, carbon dioxide and water to produce food. Animal obtains energy from the plant and other animals because they do contain chlorophyll pigment and thus, can not produce their own food and called as heterotrophs. Thus, heterotrophic nutrition involves in the intake of complex material prepared by another organism.

Plants have external cell wall present outside of cell membrane which provides shape and stability to plants. Option A is correct.

Bacteria are primitive organisms with Prokaryotic cells. Option B is correct.