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455 questions in this collection · Page 7 of 46
Question 61 of 455
📘 CLASS XII
Microbes In Human Welfare
Besides plague and leprosy, antibiotics have greatly improved our capacity to treat which two deadly diseases?
Antibiotics have greatly improved our capacity to treat deadly diseases such as plague, whooping cough (kali khansi ), diphtheria (gal ghotu) and leprosy (kusht rog).
Question 62 of 455
📘 CLASS XII
Microbes In Human Welfare
Which type of microbe is rod-shaped, as shown in Figure 8.1 (a) and (c), and spherical shaped, as shown in Figure 8.1 (b)?
Figure 8.1 shows various shapes of Bacteria (Rod-shaped, Spherical shaped).
Question 63 of 455
📘 CLASS XII
Microbes In Human Welfare
The virus shown in Figure 8.2 (b) that causes respiratory infections is:
Figure 8.2 (b) shows Adenovirus which causes respiratory infections.
Question 64 of 455
📘 CLASS XII
Microbes In Human Welfare
What is the specific name given to the yeast *Saccharomyces cerevisiae* when it is used for fermenting fruit juices and cereals to produce ethanol?
The same yeast Saccharomyces cerevisiae used for bread-making is commonly called brewer’s yeast, is used for fermenting malted cereals and fruit juices, to produce ethanol.
Question 65 of 455
📘 CLASS XII
Microbes In Human Welfare
The primary sludge formed during sewage treatment consists of:
Primary treatment involves physical removal of particles; floating debris is removed by sequential filtration, and grit is removed by sedimentation. All solids that settle form the primary sludge.
Question 66 of 455
📘 CLASS XII
Microbes In Human Welfare
The BOD test measures the rate of uptake of oxygen by micro-organisms in a sample of water, which indirectly measures the amount of:
The BOD test measures the rate of uptake of oxygen by micro-organisms in a sample of water and thus, indirectly, BOD is a measure of the organic matter present in the water.
Question 67 of 455
📘 CLASS XII
Microbes In Human Welfare
What is the depth range (in feet) of the concrete tank typically used in a biogas plant?
The biogas plant consists of a concrete tank (10-15 feet deep) in which bio-wastes are collected and a slurry of dung is fed.
Question 68 of 455
📘 CLASS XII
Microbes In Human Welfare
The spent slurry removed from the biogas plant outlet is typically used as a:
The spent slurry is removed through another outlet and may be used as fertiliser.
Question 69 of 455
📘 CLASS XII
Microbes In Human Welfare
The use of chemical insecticides and pesticides is toxic and harmful to human beings, animals, and contributes significantly to the pollution of:
These chemicals are toxic and extremely harmful... and have been polluting our environment (soil, ground water), fruits, vegetables and crop plants.
Question 70 of 455
📘 CLASS XII
Microbes In Human Welfare
The organic farmer adopts a holistic approach where pests are kept at manageable levels by relying on:
The organic farmer... works to create a system where the insects that are sometimes called pests are not eradicated, but instead are kept at manageable levels by a complex system of checks and balances within a living and vibrant ecosystem.