Question

$\huge{\colorbox{aqua} {\boxed{\tt{QUESTION:}}}}$

7. (a)Mention the irrigation method used for areas having acute water shortage. How is this irrigation done?
(b) What is water lodging? How does it affect the crop?

8. Why the friction essential? Give any three examples.​

Answer 1

Answer:

(a)Drip irrigation is adopted extensively in areas of acute water scarcity or where there exists either or both land and water are found of poor quality. ... Micro-irrigation ensures increased crop yield, high water use efficiency, reduced water and energy consumption and minimal weed problems.

(b)Waterlogging lowers oxygen levels in the root zone, which reduces plant growth. Waterlogging increases the reduction potential of the soil and changes the chemical equilibrium of many elements which then enter the soil-water solution in their ionic forms.

(c)We can walk because of friction between surface and legs. Vehicles move and stop because of the friction of the brakes and the tires. Writing with pen requires friction and also rubbing with an eraser uses friction. Airplanes can fly and move in the air because of friction in the air called drag or air resistance.

Hope this helps...

Answer 2

${\huge{\underline{\sf{Given:- }}}}$

7(a) Mention the irrigation method used for areas having acute water shortage. How is this irrigation done? 

(b) What is water lodging? How does it affect the crop?

8. Why the friction essential? Give any three examples.

${\huge{\underline{\sf{Answers:- }}}}$

7(a) Drip irrigation is adopted extensively in areas of acute water scarcity and especially for crops and trees such as coconuts, containerized landscape trees, grapes, bananas, ber, eggplant, citrus, strawberries, sugarcane, cotton, maize, and tomatoes.

(b) Waterlogging lowers oxygen levels in the root zone, which reduces plant growth. Waterlogging increases the reduction potential of the soil and changes the chemical equilibrium of many elements which then enter the soil-water solution in their ionic forms.

(8a) We can walk because of friction between surface and legs. Vehicles move and stop because of the friction of the brakes and the tires. Writing with pen requires friction and also rubbing with an eraser uses friction. Airplanes can fly and move in the air because of friction in the air called drag or air resistance.

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${\large{\red{\underline{\bf{Hope \: It'll \: Helps!}}}}}$