Invasive and Keystone Species Concepts

The video discusses the concept of invasive species, which are non-native organisms that disrupt ecosystems, and keystone species, which are crucial for maintaining ecosystem balance. It explains how invasive species can cause harm, while keystone species support biodiversity. The video uses examples like water hyacinth and elephants to illustrate these concepts, highlighting the importance of managing invasive species to protect ecosystems.

Why did the Tamil Nadu government ask civic agencies to clear certain species?

• To plant more trees

• To remove invasive species

• To clear space for new construction

• To promote tourism

What is a characteristic of invasive species?

• They are always beneficial to human health

• They significantly disrupt the ecosystem

• They help in maintaining biodiversity

• They are native to the ecosystem

Which of the following is an example of an invasive species mentioned in the video?

• Elephants

• Sea urchins

• Sea otters

• Water hyacinth

Why is it important to monitor the growth of invasive species?

• They help in increasing biodiversity

• They are beneficial for human health

• They can significantly impact the environment

• They have no impact on the environment

What defines a keystone species?

• A species that can be easily replaced by another

• A species that is the most abundant in an ecosystem

• A species that helps define an entire ecosystem

• A species that is always a predator

What happens if a keystone species disappears from an ecosystem?

• The ecosystem remains unchanged

• The ecosystem may radically change

• New species will not populate the habitat

• The ecosystem will become more diverse

Which animal is considered a keystone species in African savannas?

• Zebras

• Giraffes

• Elephants

• Lions

How do sea otters function as a keystone species?

• By being a primary food source for sharks

• By being the largest marine animal

• By controlling sea urchin populations

• By eating seaweed

What is the main difference between invasive and keystone species?

• Keystone species destroy biodiversity

• Keystone species are always the most abundant

• Invasive species are always predators

• Invasive species disrupt ecosystems, while keystone species maintain them

What role do keystone species play in food webs?

• They have a huge influence on food webs

• They are always at the top of the food chain

• They have no influence on food webs

• They are the only source of food for all species