Question

What are the outside raw materials used by an organism?
A) Food by heterotrophic organisms.
B) Carbon dioxide, minerals, and water by autotrophic organisms.
C) Oxygen by all aerobic organisms.
D) All of the above.

Answer 1

Hint: All living entities are in constant need of energy for sustaining and maintaining life. Plants and animals differ widely in the intake of their raw materials which are prerequisites for their survival.

Complete Answer:
All the organisms depend on the environment for accomplishing their biological demands. Whatever raw materials are required by the living organisms varies widely in accordance with the organism complexity as well as that of its environment.

A) Option A: Heterotrophic organisms are those organisms which cannot produce their own food. Thus, they depend on other plants and animals for energy and mineral supply.
B) Option B: Autotrophic organisms are those organisms which can produce their own food. In these organisms, water acts as a preliminary source for food digestion and supplementing other requirements of the body’s processes. Carbon dioxide and minerals along with water help in producing food in presence of light energy via the process of photosynthesis.
C) Option C: Aerobic organisms are those organisms which require oxygen for their survival. In such an organism, oxygen plays a chief role in the breakdown of food in order to supplement the body with its ever-increasing energy demands.
D) Option D: As, all the options are correct, therefore, this is the correct option.

Thus, the correct option is D) All of the above.

Note: The only organisms that can make their own food are plants, and hence they are known as autotrophic organisms. Humans and other animals need food for the following reasons,
- They provide energy to the body.
- They help in growth of the organism.
- They help by providing necessary vitamins, minerals, proteins, etc which are necessary for normal functioning of the body.