Which of the following is correct sequence in food chain?

Identify the likely organisms $\left(1\right), \left(2\right), \left(3\right)$ and $\left(4\right)$ in the food web shown below

Which of the following representations shows the pyramid of numbers in a forest ecosystem

Study the four statements (a-d) given below and select the two correct ones out of them.

(a) A lion eating a deer and a sparrow feeding on grain are ecologically similar in being consumers.

(b) Predator starfish Pisaster helps in maintaining the species diversity of some invertebrates.

(c) Predators ultimately lead to the extinction of prey species.

(d) Production of chemicals such as nicotine, strychnine by the plants is a metabolic disorder.

The two correct statements are: