Microbes in Human Welfare - Online Test
Q1. Rotenone is
Answer : Option C
Explaination / Solution:
Rotenone is a naturally occurring chemical with insecticidal properties, obtained from the roots of the several tropical and subtropical plant species.
Q2. Symbiotic association of fungi with plant are called as
Answer : Option C
Explaination / Solution:
Symbiotic association of fungi with angiosperm plant root is called mycorrhiza. Most of the plants have this kind of relation. The fungus obtains some sugar from the plant and plant get minerals and water absorbed by fungi.
Q3. Agriculture by using only biofertilizers is called
Answer : Option C
Explaination / Solution:
Organic farming is the practice of agriculture in which no chemical substance is used as fertilizers, pesticides or insecticides. Biofertilizers are used to provide nutrient.
Q4. Which one of the following is not used in organic farming?
Answer : Option C
Explaination / Solution:
In organic farming snail is not used. Glomus is kind of fungi used in organic farming for maintaining fertility of soil. Earthworm the process of composting to form vermiform compost and Oscillatoria is an algae that fix the nitrogen.
Q5. One of the free-living anaerobic nitrogen-fixer is
Answer : Option B
Explaination / Solution:
Rhodospirillum is a free living anaerobic nitrogen-fixer. Rhizobium lives as symbiotic with leguminous plants and Azotobacter and Beijerinckia are symbiotic nitrogen fixer.
Q6. Organism like Escherichia coli and Chlamydia trachomatis fall into which domain?
Answer : Option D
Explaination / Solution:
Escherichia coli and Chlamydia trachomatis fall into which Bacteria family. Bacteria can live in all kind of environment like air, water and soil including inside the body of plants and animals as parasite.
Q7. Which one of the following is used as biological insecticide?
Answer : Option D
Explaination / Solution:
Tiger beetle is a large group of beetles known for their aggressive predatory habits and running speed. They are used as biological insecticides in organic farming practices.
Q8. The discovery that led to development of first antibiotic was made by
Answer : Option C
Explaination / Solution:
The discovery of first antibiotic was related to A.Flemming observations about the secretion of some chemicals from Penicillium notatum that prohibited the growth of bacteria.
Q9. Which one of the following plant is commonly used as green manure?
Answer : Option A
Explaination / Solution:
Green manure is organic substance that increases the fertility of soil. Crotalaria juncea is grown into and ploughed to soil that decompose and increase the fertility.
Q10. The biological control of agricultural pests, unlike chemical control is
Answer : Option C
Explaination / Solution:
The biological control of agricultural pest, unlike chemical control is called self-perpetuating as biological control has power to renew or perpetuate oneself of itself for indefinite length of time.
