7. Name two ecological problems which are caused by
application of synthetic chemicals to crop fields.
8. What are weeds ?
9. Give name of a solid fumigant.
10. What are the signs of infestation of stored grains?
11. Enlist four types of diseases of animals which can
also be transmitted to human beings.
12. How many varieties of Aseel are popular among
Indians ?
13. What are broilers ?
14. When do the layers start laying eggs?
15. What is aquaculture ?
16. Give names of six fishes used in composite fish
culture in India.
please answer all questions I give brainlist answer
Answers
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(1)The two ecological problems which are caused by application of synthetic chemicals to crop fields are as follows:
(i)They tend to disturb the other life system in the environment.
(ii)They also cause disease in humans causing paralysis of farmers or causing the cancer in farmers .
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(2)Weeds are unwanted plants. They grow with crops and compete for nutrients and water with main crop.
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(3)Solid fumigant: Aluminium phosphide
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(4)Common signs of an insect infestation: Sweet, musty odor in grain. The lesser grain borer is known to leave behind dust and thin brown shells in grain, as well as a sweet, musty scent.
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(5)Fᴏᴜʀ ᴛʏᴘᴇs ᴏғ ᴀɴɪᴍᴀʟ ᴅɪsᴇᴀsᴇ ᴡʜɪᴄʜ ᴄᴀɴ ᴀʟsᴏ ᴛʀᴀɴsᴍɪᴛᴛᴇᴅ ᴛᴏ ʜᴜᴍᴀɴs:-
(ɪ)Anthrax
(ɪɪ)Australian bat lyssavirus
(ɪɪɪ)Brucellosis.
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(6)The popular varieties of Aseel are Peela (Golden red), Yakub (Black and red), Nuri (White) and Kagar (Black).
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(7)Broiler chickens are chickens raised specifically for meat. Generally a hybrid of breeds designed to grow rapidly, broiler chickens are widespread within factory farms around the world.
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(8)Layer chickens are such a special species of hens, which need to be raised from when they are one day old. They start laying eggs commercially from 18-19 weeks of age. They remain laying eggs continuously till their 72-78 weeks of age.
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(9)Aquaculture is the breeding, rearing, and harvesting of fish, shellfish, algae, and other organisms in all types of water environments. ... There are two main types of aquaculture—marine and freshwater. NOAA efforts primarily focus on marine aquaculture, which refers to farming species that live in the ocean and estuaries.
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(10)Rohu, Catla, Mrigal, Silver carp, Grass carp and Common carp.
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