Assertion : Antigen can be easily recognized because it has antigenic determinants.
Reason : The recognition ability is innate.
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
B.
If both assertion and reason are true but reason is not the correct explanation of assertion
Antigen is any substance that may be specifically bound by an antibody molecule. These are mainly proteins but can be polysaccharides, glycoproteins or other types of conjugated proteins, nucleic acids or chemicals.
Each antigen has many antigenic determinants, also called epitopes, of the antigen. As each antibody binds with 2 or more such determinants, one antigen can bind with many antibodies. The recognition ability is innate and develops without exposure to the antigen. When the antigen first enters the body, it can bind directly to the appropriate receptors on B cells. However, a full antibody response requires that the B cells contact helper T cells. ln the case of T cells, the antigen is taken up by an antigen-presenting cells and partially digested. A peptide fragment of it is presented to the appropriate receptors on T cells. In either case, the cells are stimulated to divide, forming clones of cells that respond to this antigen.
Assertion : Chlorofluorocarbons are responsible for ozone depletion.
Reason : Ozone level decreases by as much as 67% every year.
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
Which part of the world has a high density of organism?
Deciduous forests
Grasslands
Tropical rain forests
Savannahs
Pure line breed refers to
heterozygosity only
heterozygosity and linkage
homozygosity only
homozygosity and self assortment
If a homozygous red-flowered plant is crossed with a homozygous white-flowered plant, the offsprings will be
half- white flowered
half- red flowered
all white flowered
all red flowered
Gene which suppresses other gene's activity but does not lie on the same locus is called as
epistatic
supplementary
hypostatic
codominant
Assertion : The earliest fossil form in the phylogeny of horse is eohippus.
Reason : Eohippus lived during the early pliocene epoch.
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 : Pollution is always caused by human activities.
Reason : Pollution is not different from contamination.
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 : Vegetable oils are fats which are present in plant cells in soluble form.
Reason : Vegetable oils occur only in cells of embryo.
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 : Haemophilia is a recessive sex linked disease.
Reason : Haemophilia occurs due to mutation of a structural gene on chromosome 15.
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
