1. Ichthyology is related to the study of fishes. It is a branch of zoology that studies the classification, morphology, physiology, behaviour, ecology, and evolution of fishes.

2. People working in the field of ichthyology are called ichthyologists.

1. Sunlight has seven colors.

2. Seven colours – violet, indigo, blue, green, orange, yellow and red.

3. Violet has the shortest wavelength, while red has the longest wavelength.

4. The seven colours contained in sunlight can often be seen in rainbows.

5. Rainbows are formed when sunlight passes through raindrops.

Kharif crops – The crops sown in June-July in the Indian subcontinent are called Kharif crops. These crops are harvested in October and November. These require high temperature and humidity at the time of sowing and dry environment at the time of ripening.

Main Kharif crops – Cotton, groundnut, paddy, millet, maize, sweet potato, urad, moong, moth cowpea (Chanwala), jowar, arhar, dhaincha, sugarcane, soybean, okra, sesame, guar, jute, flax etc.