Please select a subject first
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Briefly explain the role of the following in providing defence against infection in the human body:
T-cells
Concept: Antibodies
What are the vestigial organs?
Concept: The Immune System >> Lymphoid Organs
Give any one example of a vestigial organ in human body.
Concept: The Immune System >> Lymphoid Organs
If a person shows the production of interferons in his body, then he is suffering from ______.
Concept: Human Health >> Interferons
Assertion: Lymphocytes originate and proliferate in primary lymphoid organs.
Reason: Spleen is a secondary lymphoid organ.
Concept: The Immune System >> Lymphoid Organs
Observe the relation between the first two words and then fill in the fourth word.
Histamine: Mast cells :: Antibody: ______.
Concept: Antibodies
Expand DDT
Concept: Microbes in Industrial Products
Give reasons for the following:
Nitrogenous fertilizers are not applied in fields where leguminous crops grow.
Concept: Microbes as Biocontrol Agents
Why are the spores of Bacillus thuringiensis used as bioinsecticide?
Concept: Microbes as Biocontrol Agents
Give the biological name of the following:
The mould from which penicillin is obtained.
Concept: Microbes in Industrial Products
Give the biological name of the following:
The microbe used to control insect larvae growing on cotton.
Concept: Microbes as Biocontrol Agents
Give the biological name of the following:
The microbe used to produce Swiss cheese.
Concept: Microbes in Household Products
Give the biological name of the following:
The fungus that is being developed as a bio-control agent.
Concept: Microbes as Biocontrol Agents
Give the biological name of the following:
A symbiotic nitrogen-fixing bacterium found in root nodules.
Concept: Microbes in Household Products
Which one of the following factors is responsible for activation of protoxin into active Bt toxin of Bacillus thuringiensis?
Concept: Microbes in Household Products
Home-made fruit juices are turbid, while the bottled ,fruit juices purchased from the market are clear. Give a reason for this difference.
Concept: Microbes in Household Products
Read the passage given below carefully and answer the questions that follow:
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The bacterium Bacillus thuringiensis serovar israelensis (Bti) is commercially prepared in various formulations such as liquid, water dispersible granules, powders, and pellets. It is used as a larvicide all over the world due to its ability to produce a toxic protein that primarily targets the larvae of mosquitoes. In Sweden, Bti has been applied on a large scale in the form of commercially available granular formulation Vecto Bac G (Valent BioScience, USA). The applications have taken place in the lower Dalalven River Area to control mass outbreaks of the floodplain mosquito Aedes sticticus. |
- Why does the toxic protein kill the insects but not the bacterium?
- Can the formulation Vecto Bac G be used to eliminate the species of mosquito referred to above? Why?
Concept: Microbes in Household Products
Why are the biocontrol agents preferred over the chemical pesticides?
Concept: Microbes as Biocontrol Agents
Why are some molecules called bioactive molecules?
Concept: Microbes in Industrial Products
Mention the respective source and state the specific use of any two bioactive molecules.
Concept: Microbes in Industrial Products
