🧫
Microbes in Human Welfare MCQs
Class XII Biology
•
NCERT Based
•
NEET Practice
📘 Concept Based
📝 Exam Level
🤖 AI Explanations
This page score: 0/40
455 questions in this chapter
Question 191 of 455
📘 CLASS XII
What characteristic of cyanobacteria (e.g., *Anabaena*) makes them useful as biofertilisers in paddy fields?
Cyanobacteria... many of which can fix atmospheric nitrogen, e.g. Anabaena, Nostoc, Oscillatoria.
Question 192 of 455
📘 CLASS XII
What is the significance of culturing bacteria and fungi on nutritive media to form colonies?
Microbes like bacteria and many fungi can be grown on nutritive media to form colonies... Such cultures are useful in studies on micro-organisms.
Question 193 of 455
📘 CLASS XII
In cheese making, microbes are used to provide the food items with particular:
Microbes are used to impart particular texture, taste and flavor to cheese.
Question 194 of 455
📘 CLASS XII
The major class of industrial products derived from microbes, alongside beverages, is:
Beverages and antibiotics are some examples.
Question 195 of 455
📘 CLASS XII
Penicillin was accidentally discovered by Alexander Fleming around a mould growing on a culture plate that was contaminated with:
Alexander Fleming while working on Staphylococci bacteria, once observed a mould growing in one of his unwashed culture plates.
Question 196 of 455
📘 CLASS XII
Which acid is produced by the fungus *Aspergillus niger*?
Aspergillus niger (a fungus) of citric acid.
Question 197 of 455
📘 CLASS XII
The use of enzymes like pectinases and proteases in fruit juice clarification helps to break down:
The bottled juices are clarified by the use of pectinases and proteases.
Question 198 of 455
📘 CLASS XII
The term ‘Biocontrol’ is used for controlling plant diseases and pests using:
Biocontrol refers to the use of biological methods for controlling plant diseases and pests.
Question 199 of 455
📘 CLASS XII
Which pair of insect predators are mentioned as useful biocontrol agents?
The Ladybird... and Dragonflies are useful to get rid of aphids and mosquitoes, respectively.
Question 200 of 455
📘 CLASS XII
The ability of mycorrhizal fungi to absorb phosphorus from the soil and pass it to the plant enhances the overall outcome of:
The fungal symbiont... absorbs phosphorus from soil and passes it to the plant... [leading to] an overall increase in plant growth and development.
