CTET 2 Math and Science 22 Dec 2021 Paper

Shaurya went for a trekking trip. During the trek he accidently placed his hand on the bush. He felt the sting and his hand started itching. The instructor immediately took a leaf of one of the plants, crushed it and rubbed it on the affected area. What could be the nature of the chemical which caused sting and nature of the leaf respectively?