Select saturated hydrocarbons from the following :

C₃H₆ ; C₅H₁₀ ; C₄H₁₀ ; C₆H₁₄ ; C₂H₄

What is meant by scattering of light? The sky appears blue and the Sun appears reddish at sunrise and sunset. Explain these phenomena with reason.

(a) Draw a ray diagram to show the formation of image by a concave lens when an object is placed in front of it.

(b) In the above diagram mark the object-distance (u) and the image-distance (v) with their proper signs (+ve or -ve as per the new Cartes. ian sign convention) and state how these distances are related to the focal length (f) of the concave lens in this case.

(c) Find the nature and power of a lens which forms a real and inverted image of magnification -1at a distance of 40 cm from its optical center.

What happens when a Planaria gets cut into two pieces?

Why are green plants called producer?