What is the advantage of selecting seeds of crops with wider adaptability for agriculture?

Find out the correct sentence about manure:
$(i)$ Manure contains large quantities of organic matter and small quantities of nutrients.
$(ii)$ It increases the water holding capacity of sandy soil.
$(iii)$ It helps in draining out of excess of water from clayey soil.
$(iv)$ Its excessive use pollutes environment because it is made of animal excretory waste.

Sitaram,an educated farmer,convinces his friends to use manure instead of fertilizers in their fields. List any two advantages that the farmers will get if they accept this advice. How does the excessive use of fertilizers affect the environment? Which values of Sitaram are depicted by his efforts?

$A$ farmer had a plot just beside the bank of a river. Each time he planted $Kharif$ crops,the crops got damaged due to floods. He consulted an agricultural scientist who gave him a special variety of seeds and also advised him to practice fish farming.
$(a)$ What was the specialty of these seed grains?
$(b)$ What name can be given to this type of fish farming?

$(i)$ Name the three varieties of pesticides used.
$(ii)$ Write the problems related to the excess use of pesticides.

The number of dengue cases has increased in Sana's village in the last one year. She read in her textbook that diseases like dengue spread through mosquitoes which breed in stagnant water. She immediately suggested to her friends that they should kill the mosquitoes in water bodies in the locality. They also took the help of the nearest municipal office.
$(a)$ Which preventive measures do you suggest for the prevention of such diseases caused by mosquitoes? Mention any two measures.
$(b)$ Which values are displayed by Sana in taking this initiative?
$(c)$ Suggest one school activity to promote such values in school students.