During the refraction of light wavelength and speed change. Frequency is always a constant quantity.

Animal tissues are categorised into four basic types on the basis of their structure and functions. The four basic types of tissues are epithelial connective, muscular and nervous tissue.

A mixture which has uniform composition throughout, i.e., without any clear boundary of separation is known as homogeneous mixture.

Class 9th Science Session 2022-23 Class IX Science MCQ Extra Questions Answers Class 9 Science Terminal Exams MCQ Solutions 9th Science Terminal Exam Based MCQ Extra Questions