Complete the crossword puzzle (Fig.).
Across
$1.$ Oil yielding plant $(9)$
$3.$ Crop grown in winter season $(4)$
$5.$ Fixed by Rhizobium $(8)$
$9.$ Common honey bee $(4)$
Downward
$2.$ Animal feed $(6)$
$4.$ $A$ micronutrient $(5)$
$6.$ Unwanted plant in crop fields $(4)$
$7.$ An exotic breed of chicken $(7)$
$8.$ Bottom feeders in fish pond $(7)$
$10.$ $A$ marine fish $(4)$

Write three advantages of crops growing in shorter duration of time compared to those growing in longer duration of time.

Kavita,the science teacher,was teaching her students about the types of diseases based on duration: acute and chronic diseases. She also discussed their ability to spread in public and their immediate causes.
$(a)$ What are acute and chronic diseases? Give one example of each.
$(b)$ Name the type of diseases which spread by coming in contact with a sick person. Name the different types of organisms which cause diseases.

How can poultry farming be integrated with crop production? How are improved poultry breeds developed in poultry farming?

In India,about $45 \%$ of the cultivated area is unirrigated,and scarce rainfall often causes crop failure,leading to drought-like conditions. This situation motivated villagers to use rainwater harvesting and watershed management.
$(i)$ What is meant by irrigation?
$(ii)$ List two different kinds of irrigation systems which can be adopted to supply water to agricultural land.
$(iii)$ What values does Rajan possess which helped villagers overcome their problem?

Ravjot's mother always squeezes water from wet clothes in the spinner of a washing machine and then uses it to clean the floor:
$(a)$ Write the principle of the technique used in the above-mentioned process.
$(b)$ Write one more application of this technique.
$(c)$ What do you learn from Ravjot's mother?