Presentation on

HETEROTROPHIC NUTRITION & TYPES OF NUTRITION

HOLY FAMILY CONVENT SR. SEC. SCHOOL

SUBMITTED TO –

Hina Madam

SUBMITTED BY-Harshita AdwaniVII-’B’

HETEROTROPHIC NUTRITION

All animals including man &

all non green plants depend on

green plants for organic

food .They are known as

heterotrophs & their mode of

nutrition is called heterotrophic

nutrition.

This involves following

steps :

1. INGESTION

 This is the process in which food is taken inside the body.

2.  DIGESTION

  It is the process of breaking complex molecules of organic food into simpler molecules .This takes place with the help of digestive juices which contain different Specific enzymes acting on specific food components like carbohydrates , fat, protein etc. This process is called digestion.

3 . ABSORPTION

In this process digested food is absorbed & transported to each & every cell of the body.

4. ASSIMILATION  Inside the cell absorbed food is converted

into living substance i. e. protoplasm .This is called assimilation.

5 . EGESTIONThe undigested food is eliminated outside

the body.

3 . ABSORPTION

In this process digested food is absorbed & transported to each & every cell of the body.

4. ASSIMILATION  Inside the cell absorbed food is converted

into living substance i. e. protoplasm .This is called assimilation.

5 . EGESTIONThe undigested food is eliminated outside

the body.

Types of nutrition

(A) Autotrophic nutrition:

Autotrophs can made their food by themselves.e.g: green plants can synthesize the high energy food (sugar - starch - fats and proteins) from simple, low energy materials (C02 - water and mineral alts) through the phenomenon of photosynthesis.

(B) Heterotrophic nutrition:

Heterotrophs obtain high-energy food from other organisms, either green plants or animals that were previously feeding on plants. They can be classified as follows

1. Holozoic : Is divided into• Carnivores: Feed on animal's flesh, such as dogs. • Herbivores: Feed on plants, such as Rabbits.• Omnivores: Feed on7plants and animals, such as Man.

2. Parasites: Obtain their food either ready-made or partially prepared from other living organisms called host. Parasites will be harmful to the host.* Types of Parasites:a- Ectoparasites : Such as Fleas, Mosquitoes, fungi. b- Endoparasites : Such as tape -worms, Bacteria.

3. Saprophytes:Obtain their food in a liquid form, from decayed remains of dead organisms. e.g: some fungi, saprophytic bacteria.

Autotrophic nutrition that carried out by the green plants includes two processes:

1. Absorption of water, salts, and

C02

2. The photosynt

hesis.

Absorption of water and salts

Higher green plants absorb water and mineral salts from the soil through root hairs in the root system.

Mechanism of water AbsorptionThis mechanism depends on Physical

phenomena which they are: