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.