Question

Type of heterotrophic nutrition adopted by animals depend mainly on

• A. Type and availability of food material.
• B. The way by which food is obtained/ accessed by an animal.
• C. Kind of digestive system available in an animal (eg., cow or a lion).
• D. All of these.

Answer 1

The correct option is D

All of these.

The correct option is D:

• The nutrition mode in which the organisms get their food from other organisms is known as heterotrophic nutrition. It is of three types:

1. Holozoic nutrition includes the organisms that digest and absorb the food after ingestion. The water products are excreted.
2. Saprophytic nutrition involves the absorption of nutrients from dead organic matter.
3. The parasitic nutrition occurs by taking nutrition from other organisms at their expense.

• The type of nutrition taken by the animals depends on the type of food material available for the organisms. The organisms adjust their mode of nutrition accordingly.
• It also depends on the method used by the organisms to obtain their food. Some organisms ingest their food, while some absorb the nutrition from dead matter.
• The type of digestive system present in the animals also helps determine their nutrition mode as different types of organisms differ in their digestive systems.

The explanation for incorrect options:

Option A:

• The type of digestive system in the organisms and their way of obtaining their food also helps determine their nutrition mode.

Option B:

• The food type and its availability and the digestive system type also help in determining the nutrition mode of the organisms.

Option C:

• The availability of food in the environments and the way the animals obtain it also determines their nutrition mode.

Therefore, the type of heterotrophic nutrition adapted by animals depends on the availability and type of food, the way of obtaining the food by the animal, and the type of digestive system present in them.