SCIENCE F2 CHAPTER 2 (2.1)

CHAPTER 2

ECOSYSTEM

CONTENT STANDARD

• 2.1 Energy Flow In Ecosystem
• 2.2 Nutrient Cycle In The Ecosystem
• 2.3 Interdependence And Interaction Among

Organisms And, Between Organisms And The
Environment.
• 2.4 The Role Of Human In Maintaining A Balanced
Nature

2.1 ENERGY FLOW IN ECOSYSTEM

1. Producers are all green plants that make food
through photosynthesis.
2. Consumer are animals that eat plants or

animals.
3. Decomposers are organisms that decompose

dead organisms (animals or plants) and
change them into simple substances.
4. Example decomposer are bacteria and fungi

2.1 ENERGY FLOW IN ECOSYSTEM

5. Primary consumer: herbivores and omnivores
6. Secondary consumer :omnivore and carnivore
7.Tertiary consumer: carnivores

NEXT

HERBIVORES

Animals that eat only plants

BACK

OMNIVORES

Eat plants and animals

BACK

CARNIVORES

Eat other
animals

BACK

Producer Sunlight (energy
(green plants absorbed by green
that produce
food through plants)
photosynthesis)
Consumer
Minerals (animals that
(absorbed by eat plants or
plant roots) other animals)

Decomposer
(bacteria and

fungi that
decompose dead

organisms) 8

FOOD CHAIN
A food chain can be used to show the
feeding relationship between organisms.

Paddy Rat Snake Hawk
plants
(primary (secondary (tertiary
(producer) consumer) consumer) consumer)

Bacteria and
fungi

(decomposers)

EXAMPLE OF FOOD CHAINS

WHAT IS A FOOD WEB ?

A food web consists of several food chain that are
interlinked.
Some of energy lost (used by the organism
to move and carry out life process such as
respiration)

EXAMPLE OF A FOOD WEB :

Test yourself :

1. What is the producer in this food web?_C_a_b_b_a_g_e___
2. List out all the primary consumer :

Caterpillar , snail, grasshopper
3. What is the animal that eaten by the frog?

Grasshopper
3. Bird and frog are examples of __se_c_o_n_d_a_ry__c_o_ns_u_m_e_r_
4. Tertiary consumer is _s_n_a_ke__________

Test yourself :

Use the list of organisms below to form
a food web :

Paddy plant Grasshopper Frog
Snake Rat Caterpillar
Bird

Do this in your notebook or exercise book.
Time given – 5 minutes

ANSWERS

Paddy Rat Frog Snake
plant Grasshopper Bird
Caterpillar

ENERGY FLOW IN A FOOD WEB

• As seen in the food chain, energy is also transferred from
one organism to another organism in the food web.

• Some of energy is lost because it is used by the organism
to move and carry out life process of respiration.

• Energy is also lost in the form of heat.

QUIZ SESSION

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