Define the terms hybridization and photoperiod.

Define the term organic farming. Write its four advantages.

Farmer $X$ planted Soyabean $+$ Maize $+$ Cowpeas in the same field simultaneously in a set row pattern. Farmer $Y$ planted cereal crop in one season and leguminous plants in the next season on the same piece of land in pre-planned succession. $(a)$ Name the cropping patterns used by farmers $X$ and $Y$. $(b)$ State two advantages of the different cropping patterns followed by farmers $X$ and $Y$ respectively.

Find out the correct sentence:
$(i)$ Hybridisation means crossing between genetically dissimilar plants.
$(ii)$ Cross between two varieties is called as interspecific hybridisation.
$(iii)$ Introducing genes of desired character into a plant gives genetically modified crop.
$(iv)$ Cross between plants of two species is called as inter-varietal hybridisation.

Name the type of nutrient that we get from mustard seeds and linseed.

Which of the following conditions will give the most benefits? Why?
$(a)$ Farmers use high-quality seeds,do not adopt irrigation or use fertilizers.
$(b)$ Farmers use ordinary seeds,adopt irrigation and use fertilizer.
$(c)$ Farmers use quality seeds,adopt irrigation,use fertilizer and use crop protection measures.