Assertion : Salamander, Sphenodon are classified as amphibians.
Reason : Sphenodon is regarded as living fossil.
If both Assertion and Reason are true and Reason is the correct explantion of Assertion
If both Assertion and Reason are true and Reason is not the correct explanation of Assertion
If Assertion is true but Reason is false
If Assertion is false but Reason is true
Assertion : Rheumatoid arthritis is an inflammation of the synovial membrane in synovial joints.
Reason : Infectious arthritis mostly occurs due to bacterial and viral infection.
If both Assertion and Reason are true and Reason is the correct explantion of Assertion
If both Assertion and Reason are true and Reason is not the correct explanation of Assertion
If Assertion is true but Reason is false
If Assertion is false but Reason is true
Assertion : Monocot stem bears collateral open vascular bundles.
Reason : If cambium is absent such vascular bundles are called closed type.
If both Assertion and Reason are true and Reason is the correct explantion of Assertion
If both Assertion and Reason are true and Reason is not the correct explanation of Assertion
If Assertion is true but Reason is false
If Assertion is false but Reason is true.
Assertion : Plasma membrane is exceedingly thin and not visible as a separate layer.
Reason : It appears merely as a surface layer of cytoplasm.
If both Assertion and Reason are true and Reason is the correct explantion of Assertion
If both Assertion and Reason are true and Reason is not the correct explanation of Assertion
If Assertion is true but Reason is false
If Assertion is false but Reason is true
Cocaine is a stimulant, which may cause addiction. It is an alkaloid obtained from
Eucalyptus
Erythroxylon
Rauwolfia
Papaver
Some students, during a study, caught, marked and released 80 fishes in a pond. Later 100 fishes were caught at random. Among these 40 were found to be marked. What is the approximate number of fishes in the pond?
50
100
200
4000
The ratio in a dihybrid test cross between two individuals is given by
2 : 1
1 : 2 : 1
3 : 1
1 : 1 : 1 :1
D.
1 : 1 : 1 :1
Test cross is a cross to know the genotype of the individual.
For eg, Tall white and dwarf black can be assumed as TtWw and ttww respectively.
Gametes of TtWw = TW, Tw, tW, tw
Gametes of ttww == tW
tw | |
TW | TtWw |
Tw | Ttww |
tW | ttWw |
tw | ttww |
Thus the ratio of TtWw : Ttww : ttWw : ttww is 1 : 1 : 1 :1.
Genetic drift operates only in
island population
smaller population
larger population
none of these