Invasive Species

Invasive Species

Q1. Which of the following is a well-known invasive aquatic plant in India?

1) Water hyacinth *

2) Teak

3) Sal

4) Deodar

Explanation: Water hyacinth can form dense floating mats, obstruct waterways and adversely affect aquatic ecosystem conditions.

Q2. Which invasive weed is commonly known as Congress grass?

1) Lantana camara

2) Parthenium hysterophorus *

3) Prosopis juliflora

4) Azadirachta indica

Explanation: Parthenium hysterophorus is commonly called Congress grass and can affect agriculture, native vegetation and human health.

Q3. Which statement about alien and invasive species is correct?

1) Every alien species is necessarily invasive

2) An invasive alien species establishes and spreads, causing or threatening harm *

3) Alien species occur only in marine ecosystems

4) Invasive species always improve native biodiversity

Explanation: Alien species are introduced outside their natural range. Only some become invasive and cause or threaten ecological, economic or other harm.

Q4. Which is generally an important first-line strategy for managing invasive alien species?

1) Introducing more non-native species without assessment

2) Ignoring early infestations

3) Prevention, early detection and rapid response *

4) Removing all native plants

Explanation: Preventing introductions and responding early can limit establishment and spread before eradication or control becomes much more difficult.