Multiple Choice QuestionsC4 plants are more efficient in photosynthesis than C3 plants due to
higher leaf area
the presence of a larger number of chloroplasts
the presence of thin cuticle
the presence of thin cuticle
Heartwood differs from sapwood in
Presence of rays and fibres
the absence of vessels and parenchyma
having dead and non-conducting elements
having dead and non-conducting elements
Consider the following four statement (1-4) regarding kidney transplant and select the two correct ones out of these
1) Even if a kidney transplant is proper the recipient may need to take immuno- suppressants for a long time
2)The cell-mediated immune response is responsible for the graft rejection
3) The B-lymphocytes are responsible for rejection of the graft
4) The acceptance of rejection of a kidney transplant depends on specific interferons
The two correct statements are
(2) and (3)
(3) and (4)
(1) and (3)
(1) and (3)
D.
(1) and (3)
To prevent graft (Kidney transplant) rejection, the principle is to use chemicals, which inhibit the enitre activity of the immune system. when this occurs graft rejection is delayed. It has been show that immunosuppression may make the patients more preeen to develop cancers.One way of overcoming the problems of radiatin and immunosuppression is to suppress only the cells responsible for rejection, normally the killer T- cells .In this way, the rest of the patients immune system would continue to function normally. The most promising approach is to treat the patient with monoclonal antibodies that recognize and destroy the killer T-cells. A monoclonal antibody has been developed, which is very effective at preventing rejection of transplanted kidneys.
Coiling of garden pea tendrils around any support is an example of
thigmotaxis
thigmonasty
thigmotropism
thigmotropism
Which stages of cell division do the following figures A and B represent respectively?
Metaphase - Telophase
Telophase - Metaphase
Late anaphase - Prophase
Late anaphase - Prophase
In vitro fertilisation is a technique that involves the transfer of which one of the followings into the Fallopian tube?
Embryo only, up to 8 cells stage
Either zygote or early embryo up to 8 cell stage
Embryo of 32 cells stage
Embryo of 32 cells stage
The genetically - modified (GM) brinjal in India has been developed for
insect - resistance
enhancing self- life
enhancing mineral content
enhancing mineral content
Sertoli cells are found in
Ovaries and secrete progesterone
adrenal cortex and secrete adrenalin
seminiferous tubules and provide nutrition to germ cells
seminiferous tubules and provide nutrition to germ cells
Which one of the following cannot be explained on the basis of Mendel's Law of Dominance?
the discrete unit controlling a particular character is called a factor
Out of one pair of factors, one is dominant and the other recessive
Alleles do not show any blending and both the characters recover as such in F2 generation
Alleles do not show any blending and both the characters recover as such in F2 generation
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