What is air called a mixture ? Give five facts in supports of your answer.

Given below are the sketches of two types of cells A and B Which one of these is a plant cell? Give reason in support of your answer.

Study the diagram given below and answer the questions that follow : Is the given structure-an animal cell or a plant cell? Give reason in support of your answer.

In each of the following figures, you find two triangles. Indicate whether the triangles are similar. Give reasons in support of your answer. (FIGURES)

Are humming birds and fish regulators or conformers ? Give reasons in support of your answer.

Water in lakes and ponds do not freeze at once in cold countries. Give a reason in support of your answer.

Study the diagram given below and answer the questions that follow: Which stage of pulmonary ventilation is shown in this diagram ? Give reason in support of your answer.

Do you support 'Dope' test being conducted on sportspersons perticipatting in a prestigious athletic meet? Give three reasons in support of your answer.

Is there a relationship between the size of an organism and its life span ? Give teo examples support of your answer.