Paheli dug two pits, A and B, in her garden. In pit A, she put a
polyhtene bag packed with some agricultural waste. In pit B, she
dumped the same kind of waste but without packing it in a
polythene bag. She, then covered both the pits with soil. What
did she observe after a month?
(a) Waste in pit A degraded faster than that in pit B.
(b) Waste in pit B degraded faster than that in pit A
.(c) Waste in both pits degraded almost equally.
(d) Waste in both pits did not degrade at all.
The disease caused by a protozoan and spread by an insect is
_________.
(a) dengue (c) polio
(b) malaria (d) measles
The gas released during the preparation of bread is
(a) oxygen (c) nitrogen
(b) carbon dioxide (d) sulphur dioxide
The two micro-organisms which live in symbiotic association in
lichens are
(a) fungus and protozoa (c) bacteria and protozoa
(b) alga and bacteria (d) alga and fungus
Pathogenic micro-organisms present in host cells are killed by
medicines called
(a) pain killer (c) antibiotics
(b) antibodies (d) vaccines
A disease in human beings caused by virus is _______.
(a) typhoid (c) dysentry
(b) influenza (d) cholera
Which of the following reproduces only inside a host cell?
(a) Bacteria (c) Amoeba
(b) Virus (d) Fungus.
Terms related to agricultural practice are given below. Rearrange
them in the correct sequence.
harvesting, sowing, manuring, tilling and ploughing,
irrigation, de–weeding
For discussion
Despite being one of the growing economies, our country still
has a large section of population going hungry and malnourished. Do you think an efficient crop production mechanism is
the only solution to this? Discuss in the class what else needs to
be done to root out hunger and malnutrition from our country.
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 advantage of modern agriculture implements
over traditional ones?
(iii) Name one weedicide and the precaution farmers must take
during its application.
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