Page 20 - EM BIOLOGY NOTES 10TH CLASS PSR DIGITAL BOOKS

1. NUTRITION
(FOOD SUPPLYING SYSTEM)

Lesson related 1, 2, 4 marks
 Nutrition : Procurement of nutrients is called Nutrition. Activities Question and
 Nutrients : 1. The chemical substances which are required for videos Answers PDF
pl.scan QR pl.scan QR
energy production, growth and body building are called Nutrients.
Nutrients are 5 types. They are : 1. Carbohydrates 2. Proteins 3. Lipids 4. Minerals
5. Vitamins.
2. These are present in the food materials such as grains, pulses, meat, oils, vegetables...
 Types of Nutrition : Nutrition

 
Autotrophic Nutrition Heterotrophic Nutrition
(Autotrophs)

Ex : Green plants
Photosynthetic Bacteria

  
Saprophytic Nutrition Parasitic Nutrition Holozoic Nutrition
(Saprophytes) (Parasites)
Ex : Fungi Ex : [Lice, Leeches Ex : Animals, Human beings
[Yeast, Mushrooms, Tapeworms, Cuscuta
Bread moulds] plant]

Autotrophs Heterotrophs

1. Organisms, which are 1. Organisms which can’t
prepare their food by own prepare their food by own
are called Autotrophs. are called Hetritrophs
2. Ex : Green plants 2. Ex : Fungi, Animals
Photosynthetic Bacteria

3. Chloroplasts are present 3. Chloroplasts are absent.

4. Photosynthesis occurs 4. Photosynthesis doesn’t occurs

 Autotropes can prepare their food by own with the help of chloroplasts, through
photosynthesis.
 Saprophytic Nutrition : Some organisms break down the food materials outside of the
body and then absorb it. This type of nutrition is called Saprophytic Nutrition.
 Parasitic Nutrition : Some organisms derive their food from the body of other living
organisms without killing them. This type of Nutrition is called Parasitic Nutrition.
 Holozoic Nutrition : Some organisms intake the food materials and break down it inside
their bodies. This type of Nutrition is called Holozoic Nutrition.
 Parasitic Nutrition in cuscuta :
 Cuscuta/Dodder is a leafless, twinning parasitic plant.
 The dodder contains no chlorophyll. Hence it is not autotroph.
 The root like organs that penetrate the tissue of a host plant to absorb food materials are
called Haustoria.
Photosynthesis : Carbohydrates are synthesized in chloroplasts which are present in the
green plants from CO and water in the presence of sunlight. These photochemical reaction
2
called as Photosynthesis.

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