Q28 of 49 Page 89

Define the term hybridization and photoperiod.

Hybridisation— Hybridisation refers to crossing between genetically dissimilar organisms.

Photoperiod— Duration of sunlight available to the plant is called as photoperiod. It affects the growth, flowering and maturation of crops.

If there is low rainfall in a village throughout the year, what measures will you suggest to the farmers for better cropping?

Group the following and tabulate them as energy yielding, protein yielding, oil yielding and fodder crop.

Wheat, rice, berseem, maize, gram, oat, pigeon gram, sudan grass, lentil, soyabean, groundnut, castor and mustard.

Fill in the blanks

(a) Photoperiod affect the_____

(b) Kharif crops are cultivated from _____to______.

(d) Paddy, maize, green gram and black gram are _____ crops.

(e) Wheat, gram, pea, mustard are ______ crops.

Cultivation practices and crop yield are related to environmental condition. Explain.