GRADE 7 Untitled presentation (19).pptx

GRADE 7 SCIENCE

1. Sexual and Asexual Reproduction: Nature's Ways of Creating New Life

2. Introduction to Reproduction Reproduction is how living organisms create new organisms Two main types: Sexual and Asexual Reproduction Today we'll explore how different organisms make new life Opening Circle: Share one interesting fact you know about how living things reproduce

3. What is Reproduction? A process that allows species to continue existing Creates offspring (new organisms) Helps maintain genetic diversity Ensures survival of species

4. Sexual Reproduction: The Basics Involves two parents Combines genetic material from both parents Creates unique offspring with mixed traits Found in animals, plants, and many complex organisms

5. How Sexual Reproduction Works Requires male and female reproductive cells Involves combining sperm and egg Creates genetic variation Think-Pair-Share: Discuss why genetic variation is important for survival

6. Examples of Sexual Reproduction Humans Mammals Many flowering plants Most complex multicellular organisms

7. Asexual Reproduction: Single Parent Reproduction Involves only one parent organism Offspring are genetically identical to the parent Faster and simpler process Common in simpler life forms

8. Types of Asexual Reproduction Budding (like in hydra) Binary fission (in bacteria) Fragmentation (in some plants and animals) Vegetative reproduction

9. Budding: A Unique Asexual Method New organism grows from parent's body Gradually separates when mature Common in simple organisms like hydra Compass Points Activity: Discuss pros and cons of this reproduction method

10. Binary Fission: Bacterial Reproduction Single cell divides into two identical cells Extremely rapid reproduction No genetic mixing occurs Allows quick population growth

11. Vegetative Reproduction in Plants New plants grow from parts of parent plant Examples: potato eyes, strawberry runners No seeds or flowers required Allows quick plant multiplication

12. Advantages of Sexual Reproduction Creates genetic diversity Helps species adapt to changing environments Reduces risk of genetic disorders Promotes stronger offspring

13. Advantages of Asexual Reproduction Faster process Requires less energy No need to find a mate Allows quick population growth

14. Disadvantages of Sexual Reproduction Requires finding a mate More time-consuming More complex process Less predictable offspring traits

15. Disadvantages of Asexual Reproduction Limited genetic variation Less adaptability Increased vulnerability to diseases Potential for genetic weaknesses

16. Reproduction in Different Kingdoms Animals: Mostly sexual reproduction Bacteria: Primarily asexual Plants: Can use both methods Fungi: Often use multiple reproduction strategies

17. Real-World Reproduction Strategies Some organisms use both methods Environment influences reproduction type Adaptation is key to survival Think-Pair-Share: Discuss how environment might affect reproduction

18. Reproduction and Evolution Reproduction drives genetic changes Supports species survival Helps organisms adapt Creates biological diversity

19. Reproduction in Extreme Environments Some organisms have unique reproduction methods Adaptations to survive harsh conditions Examples: Arctic plants, desert bacteria Compass Points: Discuss how extreme environments impact reproduction

20. Human Reproduction: A Closer Look Complex sexual reproduction Involves internal fertilization Requires significant parental investment Longest childhood dependency period

21. Reflection and Learning Check What are the two main types of reproduction? Name three differences between sexual and asexual reproduction How does reproduction support species survival? Exit Ticket: Write one key thing you learned today

22. Closing Thoughts Reproduction is essential for life Different strategies work for different organisms Nature is incredibly diverse Closing Circle: Share one fascinating fact you learned