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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:
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