Question

Please give me answer of both of these questions.. I need your help Thanks alot 1st is 2 mark and second is 4 mark question..

Answer 1

✍️Weeds : weeds are those plants who are undesirable and is usually of vigorous growth.

✍️Harmful effects of weed

1) Presence of weeds increases the cost of agriculture and hinders the progress of work.

2) It increases the irrigation requirement.

3) They reduce the value of produce or otherwise adds the cost of cleaning.

4) Some weeds when eaten (Cleome viscosa) by milch animals will produce an undesirable odour in the milk. At times death/disorder/disformity may occur. 
eg: Datura stramarium

✍️Methods of control

i) Preventative Weed Control

ii) Cultural Weed Control

iii) Mechanical Weed Control

iv) Biological Weed Control

v) Chemical Weed Control

✍️
Tincture iodine : (B)

Flour in water. : (A)

Brass. : (B)

Soda water. : (B)

Milk : (A)

Smoke : (A)

Air. : (B)

Blood. : (A)

✍️stands for
Heterogeneous : A

Homogeneous. : B