Differentiate between manures and fertilizers.

Vividha told Vasudha that she will show her some magic. Vividha took a metallic pipe. She asked Vasudha to hold one of its ends close to her ears. She gently tapped the other end of the pipe with a metallic object. She asked Vasudha what she heard. Vasudha said she heard two sounds.
$(a)$ Was this magic? Why did Vasudha hear two sounds?
$(b)$ What values are imbibed by Vividha?

Out of boilers and layers,which one is used to produce eggs?

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.

The preventive and control measures which are used before grains are stored for future use include:

Why should bee keeping be done in good pasturage?