"Food Chain and Food Web" Biology and Environment PPT

Description

"Food Chain and Food Web" Biology and Environment PPT

Part One Content: New Lesson Learning

There are roses, grass, leaves, aphids, ladybugs, earthworms, birds, and natural conditions such as water, sunlight, and air among the flowers.

They are interdependent and influence each other.

What kind of food relationship exists between them? Use simple words and arrows to represent this relationship in the order of who was eaten by whom.

Food web in the field

Looking for it, what food relationships can we find among them? Try using arrows to represent the food relationships between them.

food chain

Rice→rice borer→bird→snake→eagle

Phytoplankton→Fish and shrimp→Egret

Rice→grasshopper→frog→snake→eagle

rice → mouse → owl

The same plant will be eaten by different animals, and the same animal can also eat a variety of foods. This complex food relationship between organisms forms a network structure called a food web.

The food chain is a component element of the food web. Many food chains intersect and weave into a food web, which means that there are intricate web-like food relationships among organisms in the ecosystem. In fact, the food of most animals is not single, so the food chains can be intertwined with each other to form a complex network relationship.

Food chain and food web PPT, part 2: expansion and extension

The relationship between living things and the environment is very close. On the one hand, the life activities of organisms rely on the environment to obtain matter and energy, information and habitat - organisms cannot do without the environment; on the other hand, the life activities of organisms constantly change the living conditions of the environment and affect the development of the environment. Change - Organisms modify their environment. Organisms and the environment are an inseparable whole.

Man and nature are connected through the food chain. Humans' main food comes from plants and animals, and animals and plants in turn absorb nutrients from nature. If these animals and plants ingest contaminated food components in the environment, people will also accumulate them in the body through food. So we must protect animals and plants and the environment.

Food chain and food web PPT, Part 3: Class summary

One animal or plant may be the condition that another animal or plant depends on for survival, and organisms are interconnected as a whole.

Food chain and food web PPT, Part 4: In-class training

1. Fill in the blanks

1. The food relationship where food is like a chain is called ( ).

2. The food chain usually starts from ( ) and ends at ( ).

3. There are many creatures living in the flowers, including flowers, grass, butterflies, bees, and ants... There is a complex and interesting relationship between them---().

2. Choice

1. Among the following organisms, which one is not a consumer ( )

A. Green plants B. Herbivores C. Carnivores D. Microorganisms

2. In the food chain consisting of eagle, wheat, snake and rat, the correct one is ( )

A.Wheat Snake Rat Eagle

B.Wheat Rat Snake

C.Wheat Rat Eagle Snake

D.Eagle Snake Rat Wheat

Food chain and food web PPT, Part 5: Homework

Observe the ecological environment around you and draw a food web.

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Update Time: 2024-10-01

This template belongs to science courseware Fifth Grade Science Volume 1, Textbook Edition industry PPT template

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