Lakhmir Singh and Manjit Kaur Solutions for Chapter: Our Environment, Exercise 9: Multiple Choice Questions (MCQs)

Which of the following limits the number of trophic levels in a food chain?

In addition to wheat plants, a crop field ecosystem has organisms such as snake, peacock, eagle and mice. If the wheat plants are sprayed with pesticides periodically, which of the following will have the minimum concentration of pesticides in the body?

Which of the following is the best method to dispose of biological wastes from hospitals?

Select the correct statement. In an ecosystem$:$
$\left(i\right)$ the flow of energy is unidirectional
$\left(ii\right)$ the flow of materials is unidirectional
$\left(iii\right)$the flow of materials is cyclic
$\left(iv\right)$the flow of energy is cyclic.

The ten percent law is associated with

The harmful chemical which is accumulating in human beings through food chain is

O₂ is converted into O₃ by the action of

Which of the following cannot be added in a composting pit to prepare compost?