"Biodiversity" PPT

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"Biodiversity" PPT

Part One: Classroom Examples

[Example] (Selected and refined·Weihai Academic Examination) The essence of biological diversity is

A.Gene diversity B.Chromosome diversity

C. Diversity of ecosystems D. Diversity of living environment

[Analysis] Choose A. This question examines the three meanings of biological diversity and the relationship between them. Species diversity is the most intuitive manifestation of the diversity of biological species and is the core of the concept of biological diversity. Because the morphological structure and physiological characteristics that reflect species diversity are all controlled by genes in organisms, the essence of the diversity of biological species is biological genetic diversity. A species is a unique gene pool, and the genetic differences between different individuals in the gene pool of a species determine the differences between species. Ecosystem diversity is the external form of biological diversity.

Biodiversity PPT, Part 2: After-class exercises

1. Multiple choice questions

1. Biodiversity does not include ( )

A. Genetic diversity B. Diversity of movement patterns

C. Biological diversity D. Ecosystem diversity

[Analysis] Choose B. This question examines the connotation of biological diversity. The key to answering this question is to comprehensively and correctly understand the meaning of biological diversity, which mainly includes species diversity, genetic diversity and ecosystem diversity.

2. Yuan Longping, the "father of hybrid rice", developed new high-yielding hybrid rice varieties by using ( )

A. Genetic diversity B. Chromosomal diversity

C.Diversity of DNA D.Diversity of cells

[Analysis] Choose A. Biodiversity mainly includes species diversity, genetic diversity and ecosystem diversity. Species diversity refers to the richness of biological species. The most intuitive and basic understanding of biological diversity is species diversity; genetic diversity refers to the diversity of genetic composition within a species; ecosystem diversity refers to organisms and their Diversity of types of environments in which to survive. Hybrid rice is bred using the genetic diversity within a species, taking advantage of genetic diversity.

3. Among the following types of plants owned by my country, the plant species that ranks first in the world is ( )

A. Ferns B. Gymnosperms

C. Bryophytes D. Angiosperms

[Analysis] Choose B. This question examines my country's rich and unique biodiversity. my country is the country with the most gymnosperms in the world and is known as the "Hometown of Gymnosperms".

4. The most biologically diverse area in the earth’s environment is ( )

A. Desert B. Tropical rainforest

C. Prairie D. Farmland

[Analysis] Choose B. The most intuitive and basic understanding of biological diversity is species diversity. Tropical rainforests have the largest number of biological species.

2. Non-choice questions

7. Read the following materials and answer the questions.

Diaries of European voyagers show that before the 15th century, dodos could be seen everywhere on the island of Mauritius. Later, European colonists arrived on the island of Mauritius. They hunted the dodo bird for its tender and delicious meat. In addition, the pigs and dogs brought by the colonists also fed on the eggs and young birds of the dodo bird. The dodo bird became extinct. . Following the extinction of the dodo, the Calvaria tree on the island of Mauritius is also in danger of extinction. The tree's peel is thick and its seeds are difficult to germinate. Dodos like to eat the fruits of the Calvaria tree. After the fruits pass through the dodo's digestive tract, the peel becomes thinner and the seeds in the fruits can germinate normally.

(1) The extinction of the dodo is the disappearance of a biological species. Human activities have destroyed _________ diversity.

(2) The dodo disappeared, and the gene pool composed of dodo individuals also disappeared, and human activities also destroyed ___________ diversity.

(3) After the extinction of the dodo, the Calvaria tree could not sprout normally, causing the forest ecosystem to be damaged and many organisms to lose their habitat, resulting in further loss of ____________ diversity and ____________ diversity.

[Analysis] This question mainly examines the connotation of biological diversity. The dodo, as a creature on the earth, constitutes the diversity of biological species; each creature is a rich gene pool. If the dodo disappears, humans will never If the earth loses this gene pool, it will destroy the diversity of genes, that is, genetic diversity; the dodo's living environment will be destroyed, leading to further destruction of the diversity of the ecosystem.

Answer: (1) species (2) genetics

(3) Ecosystem species

Keywords: Jiangsu Education Edition eighth grade biology PPT courseware free download, biodiversity PPT download, .PPT format;

For more information about the "Biodiversity and its Protection of Biodiversity" PPT courseware, please click on the Biodiversity and its Protection PPT Biodiversity PPT tab.

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Update Time: 2024-09-08

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