Directions: Study the following questions carefully and answers the questions given below:
Important for :
» Explain it
A
Jethro Tull was an English agricultural pioneer from Berkshire who helped bring about the British Agricultural Revolution. He perfected a horse-drawn seed drill in 1700 that sowed the seeds in neat rows. He later developed a horse-drawn hoe. Tull's methods helped to provide the basis for modern agriculture.

Hence, option A is correct.
 
2
The harmful effect that one plant has on another via production of chemicals is known as –
» Explain it
C
Allelopathy is a biological phenomenon by which an organism produces one or more biochemicals that influence the germination, growth, survival, and reproduction of other organisms. These biochemicals are known as allelochemicals and can have beneficial (positive allelopathy) or detrimental (negative allelopathy) effects on the target organisms and the community. Allelochemicals are a subset of secondary metabolites, which are not required for metabolism (i.e. growth, development and reproduction) of the allelopathic organism.

Hence, option C is correct.
 
3
Which of the following seeds are mixed with mustard seeds to adulterate it and which also causes the disease dropsy?
» Explain it
B
Argemone Mexicana seeds: It is also called Mexican poppy, flowering thistle, cardo or cardosanto. These seeds contain 22–36% of a pale yellow non-edible oil, called argemone oil or katkar oil, which contains the toxic alkaloids sanguinarine and dihydrosanguinarine. Katkar oil poisoning causes epidemic dropsy, with symptoms including extreme swelling, particularly of the legs.

Hence, option B is correct.
 
4
The weed ‘Echinochola colonum’ affects which of the following crops?
» Explain it
B
The weed ‘Echinochola colonum’ affects Rice.

Hence, option B is correct.
 
5
The weed ‘Chenopodium album’ affects which of the following crops?
» Explain it
C
The weed ‘Chenopodium album’ affects Peas.

Hence, option C is correct.