Slide 1

Subject : Science
• Topic: Our Environment
• Sub- topic: food chain
• Class : 10th
• Time : 35 min.


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General Objectives
• To develop scientific attitude.
• To create interest in the science.


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Specific Objectives
• To enable the students to know the concept of Balance
in environment
.
• to make the students well awareness about Flow of
energy in living organism.
• Importance of living beings in environment.
• Making their understanding about food chain.
• Enable the students to analyse the different daily
events in the environment .


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Motivation
• What is food?
• Are all the living beings depends on each other
for their food?
• Dear students today you take rice . Would you
tell me from where it comes.
• What is the term given to this sequential flow
of energy in living being ?


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On the basis of needs of life types of
organisms
• 1.Producers : Those organisms which
synthesize their own food. Give e.g


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• 2. Consumer : Those organisms which
depends upon producer for their food.
Give e.g.


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• 3. Decomposer: Those Organisms which
depends upon dead organisms and
organic matter.
Give e.g.


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Consumer
• Types of consumers:
• Primary consumers :
Are those which depends upon for their food on green plants.
They are also
known as herbivores. For e.g Cow, Deer.

• Secondary consumers :
Are those which depends upon herbivores for their food . For e.g
Snack , bear.

• Tertiary Consumers :
Are those which take their food from secondary consumer . For e.g
Vulture , Lion.


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Food Chain
• Producers , consumers and decomposers
depends upon each other for their food .They
make a chain that is known as food chain .
• Can you give another example of food chain?


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Food Chain
PRY C

SEC C

TER CON


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Flow of energy:
• In this way all the organism get energy in the
form of food from each other.
• 1.Producer make their food itself by
photosynthesis , so they have 100% of energy.
• 2.Hervbivores get only 10% of energy from
producer.
• 3.When we move from bottom i.e producer to
tertiary consumer energy level decrease 10%
of each level.


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Flow of energy
SEC
CON 1%
PRIMARY
CONSUMER 10%
PRODUCER 100%


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Activity-Arrange these organisms according to their
food habit

• G1: Lion , Grass , Dear
• G2: Snake , Grasshopper, Frog , Grass
• G3: Algae , Small Fish, Small Aquatic
animals , big fish
• G4: Grass ,Sparrow, Snake,
Grasshopper, Eagle.


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Home Assignment
• Q1: Make an aquatic food chain.
• Q2: If all the animals are herbivores, what
will happen to the food chain ?
• Q3: If the amount of energy present in a
producer is 1000J, then what will be the
amount of energy in secondary consumers
?


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Prepared by Group_4
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Sh. Dot Ram Rana
Smt. Pushpa
Smt. Vandna Thakur
Smt. Bharti Sharma
Ms. Sunita