Which of the following is true of unsaturated fats?
(a) they are more common in animals than in plants.
(b) they have double bonds in their fatty acid chains.
(c) they generally solidify at room temperature.
(d) they contain more hydrogen than do saturated fats having the same number of carbon atoms.

The correct answer is option B.

Explanation:

The fatty acids are differentiated into unsaturated and saturated fatty acids on the basis of the double bonds they contain in their composition. If a fatty acid contains no double bond, it is known as saturated fatty acid, on the other hand, the double bond constituting fatty acids are known as unsaturated fatty acids.  

These kinds of fatty acids are abundantly found in animals. An unsaturated fatty acid contains one or more double bonds in their composition. At room temperature, the saturated fatty acids are found in solid form, while unsaturated fatty acids come in liquid form. The number of hydrogen atoms is found more in a saturated fatty acid, in comparison to an unsaturated fatty acid.