1. Autotrophic nutrition involves taking in simple inorganic substances and synthesizing organic molecules, using light as an energy source through photosynthesis. 2. Heterotrophic nutrition is obtained by digesting organic compounds, and is utilized by animals, fungi, many prokaryotes and protoctists who are unable to synthesize their own organic compounds. 3. The main nutrients discussed are proteins, carbohydrates, fats, vitamins, and minerals, each serving an important purpose in nutrition.

3. Nutrition
Nutrition is the science that interprets
the interaction of nutrition and other
substances in food in relation to
maintenance, growth, reproduction,
health and disease of an organism.

5. Autotrophic nutrition means that simple inorganic substance
are taken in and used to synthesise organic molecules.
Energy is needed to achieve this. In photo-
autotrophic nutrition light is the energy source.
In most instances the light source is solar energy,
the process being photosynthesis.

6. Heterotrophic nutrition is nutrition obtained
by digesting organic compounds. Animals,
fungi, many prokaryotes and protoctists are
unable to synthesize organic compounds to
use as food. They are known
as heterotrophs.

7. The main nutrients are proteins,
carbohydrates, fats, vitamins and
minerals. Each nutrient has a
different purpose.
Nutrients are the nutritional components in foods
that an organism utilizes to survive and grow.
Macronutrients provide the bulk energy for an
organism's metabolic system to function, while
micronutrients provide the necessary cofactors for
metabolism to be carried out.

9. Proteins are essential nutrients for the human
body.[1] They are one of the building blocks of body
tissue, and can also serve as a fuel source. As a fuel,
proteins contain 4 kcal per gram, just
like carbohydrates and unlike lipids, which contain 9 kcal
per gram. The most important aspect and defining
characteristic of protein from a nutritional standpoint is
its amino acid composition.

10. Carbohydrates can also be defined chemically as neutral
compounds of carbon, hydrogen and
oxygen. Carbohydrates come in simple forms such as sugars
and in complex forms such as starches and fiber. The body
breaks down most sugars and starches into glucose, a simple
sugar that the body can use to feed its cells.

11. Fat is a major source of energy in the diet. Dietary fat
contains ninecalories per gram, which is more than twice the
number provided by carbohydrates or protein. Due to its high
caloric content, the chance of becoming obese increases with
a high intake of fat.
Some fat is essential to proper body function. Fat fillsadipose
tissue that helps to insulate the body. Fat helps the body
absorb certain vitamins.

12. A vitamin is an organic compound and a vital nutrient
that an organism requires in limited amounts. An
organic chemical compound is called a vitamin when
the organism cannot synthesize the compound in
sufficient quantities, and must be obtained through
the diet; thus, the term "vitamin" is conditional upon
the circumstances and the particular organism.

13. A mineral is a naturally occurring substance that is solid and
inorganic representable by a chemical formula, usually abiogenic,
and has an ordered atomic structure. It is different from a rock,
which can be an aggregate of minerals or non-minerals and does
not have a specific chemical composition. The exact definition of
a mineral is under debate, especially with respect to the
requirement a valid species be abiogenic, and to a lesser extent
with regard to it having an ordered atomic structure.

14. Autotrophic nutrition means that simple inorganic substance
are taken in and used to synthesise organic molecules.
Heterotrophic nutrition is nutrition obtained by digesting organic compounds.
Animals, fungi, many prokaryotes and protoctists are unable to synthesize
organic compounds to use as food.
1. Autotrophic nutrition
2. Heterotrophic nutririon