Explanation:

• Correct option: (a) Explanation: Option (d) is correct: Doob grass or Cynodon is not an invasive species.
• Carrot grass, water hyacinth and Lantana are invasive species that pose threat to indigenous species from Indian context.
• Supplementary Notes Invasive Species: An organism that harms the ecology or the economy in a new habitat where it is not native is referred to as an invasive species.
• They can be introduced to an area by accidental release, ship ballast water, and mostly, by people.
• Threat to Biodiversity: Invasive species are putting about 42% of threatened or endangered species in danger.
• May impact wildlife in a variety of ways, including by breeding and spreading swiftly to take over a territory.
• May reduce biodiversity by causing the extinction of native animals and fl ora.
• Taking advantage of native species and outcompeting them for food or other resources are examples of direct threats.
• An ecosystem’s food chain may shift as a result of indirect threats.
• Examples include invasive carp, zebra mussels, and water hyacinth.