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Authoritative PPT Summary
"Population" PPT courseware
Part One: Species and Populations
A species is a group of individuals with similar shapes and structures that can mate with each other to produce offspring.
population
(1) Concept: refers to living in a certain area
The sum of individuals of the same species.
(1) The area can be large or small
(2) A species
(3) A group of individuals can be divided into different sizes, age differences, and male and female.
Talk about it
1. All the teachers and classmates in the classroom at this moment
2. All plants in the school botanical garden
3. An orange tree in the orange forest
4. All the fish in the pond
5. All baiji dolphins in the Yangtze River Basin of my country
6. All piranhas in one river
Population PPT, Part 2: Characteristics of the population:
1. Population density
2. Age structure
3. Gender ratio
4. Birth rate and death rate
practice
Each horizontal line in the picture represents an age group. Check, which age group were your parents in at that time? What proportion of the population does this group account for?
The length of the horizontal line indicates the number of males and females in that age group
Population PPT, Part 3: Practice
1. Population refers to——————————————————.
2. The following factors can cause the population density to increase——————————.
A. An increase in juvenile individuals in the population. B. A change in the sex ratio of the population.
C. The water and heat conditions in the environment are suitable. D. The number of juvenile individuals in the population has decreased.
E. Increase in natural enemies in the environment. F. Insufficient sunlight in the environment. G. Increase in parasites. H. Decrease in parasites.
3. The following items belong to groups————————————.
A. All the rice in a farmland B. All the ferns in a forest
C. All the crucian carp in a pond D. All the grapes in a yard
F. All the snakes in a forest G. All the rice grown by a farmer H. A nest of ants
I. A pack of wolves J. All the mice on the grassland
Keywords: Free download of science PPT courseware for the second volume of the ninth grade of Zhejiang Education Edition, population PPT download, .PPT format;
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"Population" PPT:
"Population" PPT Part One: Understanding biological populations are not the same kind of organisms, and their shapes and structures are different. Species: A group of organisms that have similar shapes and structures and can mate with each other to produce offspring. These organisms are the same organism..