Species Extinction and Adaptation | Extinct Animals | Grade 9 Science Quarter 1 Week 6

Summary

This educational video lesson focuses on species extinction and adaptation, particularly in the context of grade 9 science. It defines biodiversity and population, illustrating their concepts with examples like coconut plantations and marine ecosystems. The video discusses threatened species like the Philippine eagle and extinct species such as the Philippine rhinoceros. It delves into natural causes of extinction, including climate change, sea level changes, and cosmic radiation, as well as human-induced factors like habitat destruction and pollution. The lesson aims to connect species extinction with the inability of populations to adapt to environmental changes, emphasizing the importance of a balanced ecosystem for survival.

Takeaways

• 🌿 **Biodiversity Defined**: Biodiversity refers to the variety of life in an area, including plants, bacteria, animals, and humans.
• 🌳 **Population in Biodiversity**: A population is a group of organisms of the same species living in a certain place.
• 🐠 **Diversity Comparison**: Tuba Taharif, a marine ecosystem, is more diverse than a coconut plantation due to a higher variety of species and populations.
• 🦅 **Threatened Species**: Species with rapidly declining populations, like the Philippine eagle, are considered endangered.
• 🦏 **Extinct Animals**: The Philippine rhinoceros and Stagoden are examples of extinct species, where no members of the species remain.
• 🌡️ **Natural Causes of Extinction**: Climate change, changes in sea levels or currents, and cosmic events like asteroids and radiation can lead to extinction.
• 🌧️ **Acid Rain**: It increases soil acidity, affecting plant life and potentially making water bodies lethal for aquatic life.
• 🦠 **Disease Epidemics**: Changing climates and environments can make species more susceptible to diseases, leading to extinction.
• 🐍 **Invasive Species**: They compete with native species for resources, often leading to the decline or extinction of native species.
• 🏙️ **Human Causes of Extinction**: Increased human population, habitat destruction, pollution, and climate change are significant human-induced causes of species extinction.
• 🌱 **Balanced Ecosystems**: Organisms depend on balanced ecosystems where living and non-living elements interact harmoniously; disruptions can lead to species extinction.

Q & A

What does biodiversity refer to?

Biodiversity refers to the variety of life in an area, including every living thing such as plants, bacteria, animals, and humans.

How is a population defined in the context of biodiversity?

In biodiversity, a population is a group of organisms of the same species living in a certain place.

What is the difference between the biodiversity levels in a coconut plantation and Tuba Tahari?

Tuba Tahari, being a marine ecosystem, has a higher level of diversity with different kinds of aquatic species compared to a coconut plantation, which is dominated by coconut trees and has fewer groups of organisms.

What are threatened species?

Threatened species are those whose populations decline so fast that they become endangered, such as the Philippine eagle or the Tamaraw.

What does it mean for a species to be considered extinct?

A species is considered extinct when the last member of that species dies.

What are some examples of extinct animals in the Philippines mentioned in the script?

Some examples of extinct animals in the Philippines mentioned are the Philippine rhinoceros and the Cebu tamara.

What are the natural causes of extinction according to the script?

Natural causes of extinction include climatic heating and cooling, changes in sea levels or currents, asteroids, cosmic radiation, and acid rain.

How does acid rain affect biodiversity?

Acid rain increases the acidity of the soil, affecting plant life, and can disturb rivers and lakes to a possibly lethal level, impacting aquatic species.

What are the human causes of extinction mentioned in the script?

Human causes of extinction include increased human population, destruction and fragmentation of habitat, pollution such as water and air pollution, climate change or global warming, and habitat degradation.

Why is climate change considered a threat to species?

Climate change is a threat because it can lead to climates not found at present, making it difficult for species to adapt, and potentially leading to their extinction.

What is the importance of a balanced ecosystem for species survival?

A balanced ecosystem is crucial for species survival as it ensures that all living and non-living things interact harmoniously. Any disturbance can affect other parts of the ecosystem, impacting the survival of species.