Give a brief account of Huygens's wave theory of light

Give an account of bark.

Give a brief account of mechanism of vision.

Give a brief account on diabetes mellitus.

Give a brief account of various types of fruits.

Give a brief account of viruses with respect to their structure and nature of genetic material. Also name four common viral diseases.

Give an account of pheromones.

Give a brief account of hormonal control of parturition.

Give a brief account of water conducting tissues of higher plants.

Give an account of Calvin's cycle.

Give an account of Tuner's syndrome.