Q. 165.0( 3 Votes )
Our food grains such as wheat, rice, vegetables, fruits, and even meat are found to contain varying amount of pesticide residues. State the reason to explain how and why this happens?
During cultivation of crops, harmful pesticides are applied to protect crops from various pests. Pesticides contain harmful chemicals that cannot be decomposed. Various food materials contain some amount of pesticide sticking to them. If the fruits and vegetables are not washed properly before consumption, these pesticides enter our body. Animals feeding on plants consume harmful pesticides along with the crops. The concentration of pesticides keeps on increasing at each tropic level. Due to rains, these chemicals are washed off the soil and enter into water bodies, from where they are taken up by aquatic animals. This is the reason why meat of animals also contains traces of pesticides.
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Given below is a conversation between two farmers Heera and Beera.
Heera: Brother Beera, your maize crops looks beautiful! They have grown pretty fast.
Beera: Yes. I have sprayed urea this time. What about you?
Heera: Well, I am still relying on good old cow dung. I am saving money for buying a tractor.
Beera: That's good. Tractor saves a lot of time and labour.
Heera: Yes, it's been very labour intensive for me and now these weeds have come up.
Beera: Try weedicides, they are very effective.
Now answer the following questions.
(i) List the practices which are not environment friendly and why?
(ii) What is the advantages of modern agriculture implements over traditional ones?
(iii) Name one weedicide and the precaution farmers must take during its application.NCERT - Science Exemplar
the process of removing unwanted plants from a crop field is called?Lakhmir Singh & Manjit Kaur - Science
What do you mean by weeds? Which methods do farmers use to remove weeds?All in One - Science
Is it necessary to remove weeds from the field time to time? Give reason.All in One - Science
What precaution should be taken while spraying weedicides ? WhyLakhmir Singh & Manjit Kaur - Science
How are weeds removed from the crop fields ? Name one implement used for weeding.Lakhmir Singh & Manjit Kaur - Science
Which is the best time for the removal of weeds?Lakhmir Singh & Manjit Kaur - Science
How do weeds affect the growth of crops?Lakhmir Singh & Manjit Kaur - Science
Given below are statements about the harmful effects of weeds on crop plants.
(i) they interfere in harvesting.
(ii) they help crops plants to grow healthy.
(iii) they complete with crop plants for water, nutrients, space and light.
(iv) they affect plant growth.
Choose the correct combination of statements.NCERT - Science Exemplar