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455 questions in this collection · Page 9 of 46
Question 81 of 455
📘 CLASS XII
Microbes In Human Welfare
Methanogens are bacteria found in the rumen of cattle, where they play an important role by helping in the breakdown of:
In rumen, these bacteria help in the breakdown of cellulose and play an important role in the nutrition of cattle.
Question 82 of 455
📘 CLASS XII
Microbes In Human Welfare
Why are biogas plants more often built in rural areas?
Cattle dung is available in large quantities in rural areas... So biogas plants are more often built in rural areas.
Question 83 of 455
📘 CLASS XII
Microbes In Human Welfare
In the context of organic farming, the chemical methods commonly used in conventional farming are criticized because they:
The ‘conventional’ farming practices often use chemical methods to kill both useful and harmful life forms indiscriminately.
Question 84 of 455
📘 CLASS XII
Microbes In Human Welfare
In the biocontrol strategy using *Bacillus thuringiensis* (Bt), how is the bacteria typically applied to vulnerable plants like brassicas and fruit trees?
These [Bt spores] are available in sachets as dried spores which are mixed with water and sprayed onto vulnerable plants.
Question 85 of 455
📘 CLASS XII
Microbes In Human Welfare
What technology allowed scientists to introduce the *B. thuringiensis* toxin gene directly into plants, creating pest-resistant crops like Bt-cotton?
Because of the development of methods of genetic engineering... the scientists have introduced B. thuringiensis toxin genes into plants.
Question 86 of 455
📘 CLASS XII
Microbes In Human Welfare
Species of *Trichoderma* used as biocontrol agents are free-living fungi most commonly found in which environment?
Trichoderma species are free-living fungi that are very common in the root ecosystems.
Question 87 of 455
📘 CLASS XII
Microbes In Human Welfare
The primary role of the fungal symbiont (e.g., *Glomus*) in a mycorrhizal association is to absorb which nutrient from the soil and pass it to the plant?
The fungal symbiont in these associations absorbs phosphorus from soil and passes it to the plant.
Question 88 of 455
📘 CLASS XII
Microbes In Human Welfare
Which of the following is NOT listed as a type of microbe in the sources?
Microbes are diverse—protozoa, bacteria, fungi and microscopic animal and plant viruses, viroids and also prions.
Question 89 of 455
📘 CLASS XII
Microbes In Human Welfare
What gives different varieties of cheese their characteristic texture, flavour, and taste?
Different varieties of cheese are known by their characteristic texture, flavour and taste, the specificity coming from the microbes used.
Question 90 of 455
📘 CLASS XII
Microbes In Human Welfare
Which industrial product is commonly obtained using the fermentation of malted cereals and fruit juices by brewer’s yeast?
Brewer’s yeast... is used for fermenting malted cereals and fruit juices, to produce ethanol.