"The Role of Animals in the Biosphere" PPT Courseware 2

"The Role of Animals in the Biosphere" PPT Courseware 2

With animals, human society seems full of life with birds singing and flowers fragrant.

Without animals, humans would feel alone and lonely.

The role of animals in nature

Green plants support other living things on earth.

What role do animals play in nature?

1. The important role of animals in ecological balance

ANALYSE information:

1. Sparrows pecked and destroyed crops and were once listed as major pests. Our country launched a campaign to “eradicate sparrows.” Shanghai eliminated 686,172 sparrows and harvested 265,968 sparrow eggs within 5 days. Now experts But it calls on us to protect sparrows. Why is this?

2. Hulunbuir Grassland is the largest animal husbandry base in my country. In the past, there were many wolves there, which posed a serious threat to the development of animal husbandry. In order to protect the safety of people and animals, local herdsmen once organized large-scale wolf hunting operations. But then the hare It has developed at an alarming rate. Rabbits and cattle and sheep compete for pasture, accelerating the degradation of pastures. Think about it, what is the main reason for the increase in the number of hares?

discuss

1. After analyzing the above information, do you think humans can kill certain animals at will? Why?

2. Do you think the number of various animals can grow indefinitely in natural ecosystems? Why?

3. What inspirations did you get from the above information?

The role of animals in nature

1. Play an important role in maintaining ecological balance

2. Promote the material cycle of the ecosystem

3. Help plants pollinate and spread seeds

4. Other effects (causing harm to plants or animals, improving the environment, etc.)

one. True or False

1. Ecological balance means that the number of various organisms in the ecosystem is constant. ( )

2. my country is very rich in marine fish resources. In order to make full use of marine fish resources, we should fish more. ( )

3. In natural ecosystems, animals that are very useful to humans can grow indefinitely. ( )

two. Viewpoint Station

1. The "notorious" four pests: flies, mosquitoes, rats, and bedbugs. Because they spread diseases and do evil, they have been despised for thousands of years. "When a rat crosses the street, everyone shouts to beat it" reflects people's aspirations, but In recent years, some people have said that they are also an important link in the food chain, and eliminating the four pests is inconsistent with protecting biological diversity. What do you think about this? Debate with your classmates, and don’t forget that things will become clearer the more you debate!

2. An interesting experimental phenomenon: In a certain ranch, in order to prevent birds from eating grass seeds, scientific researchers covered the experimental area where artificial grass was planted with a net. After a while, I found that the leaves of the grass were almost eaten by insects, but the grass grew well in the natural grassland without netting.

Do you know the reason for this? What does this example illustrate?

Then let’s practice!

In the grassland, insects, birds, rabbits, microorganisms, etc. Insects eat grass; some birds eat grass seeds, some birds eat insects, and some birds eat both grass seeds and insects; birds that eat grass seeds and insects are often preyed on by animals such as foxes and hawks. It can be seen that various organisms in nature restrict each other.

After the grass is covered with nets, birds cannot fly in, and the insects that eat grass lose control of the birds and become rampant. This example shows that this experiment shows that they only saw the biological factor of the bird, but did not look at the organism and the environment as a whole. In fact, the organism and the environment are an inseparable whole.

Do you also want to know about the applications and development prospects of biology and bionics in other areas?

Please use your spare time to collect information in this area, seek answers, expand your horizons, and share it with your classmates.

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