Multiple Choice QuestionsWhen a natural predator (living being) is applied on the other pathogen organism to control them, this process is called
biological control
genetic engineering
artificial control
confusion technique
Match column I with column II and select the correct option from the codes given below.
| Column I | Column II |
| A. Commensalism | (i) One inhibited, other unaffected |
| B. Parasitism | (ii) One benefitted, other unaffected |
| C. Mutualism | (iii) Both are benefitted |
| D. Amensalism | (iv) One benefitted, other harmed |
A - (iv), B - (ii), C- (iii), D - (i)
A - (iii), B - (iv), C - (ii), D - (i)
A - (ii), B - (iv), C - (iii), D - (i)
A - (ii), B - (iv), C - (i), D - (iii)
Which of the following is used as bioinsecticide?
Bacillus polymyxa
Cylindrospermum licheniforme
Phytophthora palmivora
Chrysanthemum cinerarifolium
Most animals that live in deep oceanic waters are
tertiary consumers
detritivores
primary consumers
secondary consumers
Assertion: In a terrestrial ecosystem, detritus food chain is the major conduit for energy flow.
Reason: Solar energy is the direct source for energy supply in a detritus food chain.
If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false
Assertion : Secondary succession takes place in recently denuded area.
Reason : It is caused due to baring of an area.
If both assertion and reason are true and reason is the correct explanation of assertion
If both assertion and reason are true but reason is not the correct explanation of assertion
If assertion is true but reason is false
If both assertion and reason are false
A.
If both assertion and reason are true and reason is the correct explanation of assertion
Biotic or ecological succession is the formation of a series of biotic communities at the same site over a period of time one after the other, till a stable climax community develops over the area. It occurs generally in bare areas.
Primary succession takes place on a biological sterile soil less primary barren area.
Secondary succession takes place in a recently denuded area which still contains a lot of organic debris, remains and propagules of previous living organisms. The area has become bared due to destruction of the community previously present. The baring of an area can be caused due to forest fire, deforestation for wood, timber and habitat, overgrazing, landslides or earthquakes, excessive and repeated droughts, fallowing a cropland and repeated floods.
The bacteria which attack dead animals are
first link of the food chain and are known as primary producers
second link of the food chain and are herbivorous
third link of the food chain and are tertiary consumers
the end of food chain and are decomposers.
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