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Assertion : Dragonflies can be used to d...

Assertion : Dragonflies can be used to decrease occurrence of diseases like malaria, dengue, etc.
Reason : Baculoviruses are effective in controlling may insects and other arthropods.

A

If both assertion and reason are true and reason is the correct explanation of assertion

B

If both assertion and reason are true but reason is not the correct explanation of assertion

C

If assertion is true but reason is false

D

If both assertion and reason are false

Text Solution

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The correct Answer is:
B
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Read the following five statements (A to E) and select the option with all correct statements: The greater the BOD of waste water, more is its polluting potential. (B). Statins produced by the yeast Trichoderma polysporum act as blood -cholesterol lowering agents. (C) Baculoviruses are pathohens that attack insects and other arthropods. (D) The majority of baculoviruses used as biological control agents are in the genus Nucleopolyhedrovirus. (E) Treatment of waste water is done by the autotrophic microbes naturally present in the sewage.

Assertion : NAND is a universal gate. Reason : It can be used to describe all other logic gates.

Ecological Indicators The presence of dragonflies can reveal changes in the water ecosystems more quickly than studying other animals or plants. In fact, from the nymph to the adult stage, the dragonfly has a significant, positive ecological impact. Dragonfly eggs are laid and hatched in or near water, so their lives impact both water and land ecosystems. Once hatched, dragonfly nymphs can breathe underwater which enables them to eat mosquito larvae, other aquatic insects and worms, and even small aquatic vertebrates like tadpoles and small fish and in the air. Adult dragonflies capture and eat adult mosquitoes. Community wide mosquito control programs that spray insecticides to kill adult mosquitoes also kill dragonflies. Assertion: Releasing dragonflies in areas where there is an outbreak of malarial diseases can be an environment friendly method of control. Reason: Dragon flies are dominant species and will not allow mosquitoes to reproduce

Assertion : Colon bacilli can be used to produce glycoproteins that can be used fot hepatitis B treatment Reason : Hepatitis B is a viral disease and its spread in the body can be checked using interferons.

Disease like malaria and filariasis are transmitted through insect vectors. Vectors can be controlled by introducing fish

Assertion : Pneumonia and common cold are air -borne diseases. Reason : Dengue malaria filaria and chikungunya are vector borne diseases

Assertion: ELISA is widely used for the detection of infectious diseases like AIDS. Reason: ELISA is very sensitive and selective test and needs very small amount of reagents.

Assertion : Potassium carbonate can be prepared by Solvay process like sodium carbonate using potassium chloride as starting material. Reason : Potassium carbonate is obtained as one of the porducts when potassium superoxide reacts with carbon dioxide.

Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A) : A simple distillation can be used to separate a mixture of propanol and propanone. Reason (R) : Two liquids with a difference of more than 20^(@) C in their boiling points can be separated by simple distillations. In the light of the above statements, choose the most appropriate answer from the options given below :

NCERT FINGERTIPS-MICROBES IN HUMAN WELFARE-Microbes In Human Welfare
  1. Big holes in Swiss cheese are made by a

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  2. The residue left after methane production from cattle dung is

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  3. Mathanogens do not produce

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  4. Activated sludge should have the ability to settle quickly so that it ...

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  5. Match the items in column 'A' and column 'B' and choose correct answer...

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  6. Assertion : Nucleic acid complexes alone cannot cause diseases. Reas...

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  7. Assertion : Streptococcus thermophilus increases nitritional value of ...

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  8. Assertion : Toddy becomes unpalabtable after 24 hours. Reason : The ...

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  9. Assertion : Beer and wine are called soft liquors while gin,rum, etc.,...

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  10. Assertion : Griseofulvin extracted from P.griseofulvum is used for ri...

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  11. Assertion : Acetic acid production involves both aerobic and anaerobic...

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  12. Assertion : An organ transplant patient if not provided with cyclospor...

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  13. Assertion : Rennet and fruit extract of Withania somnifera have antago...

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  14. Assertion : Secondary treatement of sewage is also called biological t...

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  15. Assertion : Energy value of biogas is lower than that of organic matte...

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  17. Assertion : Integrated pest management (IPM) programme at the same tim...

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