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Question : (a) Describe any two devices in a flowerings plant which prevent both autogamy and geitonogamy (b) Explain the events up to double fertialisation after the pollen tube enters one of the synergids in an ovule of an angisoperm.

Question : A dense solution of CsCl,on centrifugation forms density bands of a solution of

Question : [A]: Demography is the study of human popu- lation growth & production of future develop- ment.[R]: Demographic cycle possess three stages through which nation passes.

Question : A deltoid ridge occurs in :-

Question : A deleterious allele decreases more rapidly in frequency, if it is

Question : A decrease in blood pressure / volume will not cause the release of :

Question :A dead foetus of a four month old boy child is surgically removed from the mother's uterus. But in the foetus testes were not present in the scrotum. Give reason.

Question : [A] :Deamination occurs by transaminase enzyme in kidney. [R]: Removal of COOH group from an amino acid is used in the production of urea.

Question : [A]: Darwin held that small favourable varia- tions formed the raw material for evolution.[R]: Darwin did not go into the factors which produce variations

Question : A: DDT is stored in the fat of body. R: DDT is used as pesticide.

Question : A date palm seed discovered during archaeological investigation retained viability even after 10,000 years. The retention of viability is due to the state of inactivity of embryo called _____

Question :A darkly stained body present in the somatic cells of human female but absent from those of human male is............

Question : [A]: Cytoplasmic male sterility is observed in maize. [R]: The cytoplasmic male sterility ir, maize is due to interaction of cytoplasmic factors and male sterile gene

Question : A cytologist found that the banding pattern in chromosomes of gorilla and man was similar. What inferences can be drawn from this?

Question : [A]: Cycads were prevalent during Jurassic period. [R]: Jurassic period is considered as Age of cycads

Question : A cybrid is a hybrid carrying a. . b. C.

Question : A cybrid is a hybrid carrying:

Question : A cup shaped cavity for articulation of femur head is :

Question : A cuckoo laying eggs in the nest of other species of birds is an example of :

Question : A Cross used to verify the unknown genotype of F_(1) hybrid is a ...... Cross .

Question : A cross used to verify the unknown genotype of F_(1) hybrid is a ……….cross.

Question : A cross of a wild type red-eyed female Drosophila with a violet-eyed male produces all red-eyed offsprings. If the gene is sex-linked, what should the reciprocal cross (violet-eyed femalexred-eyed male) produce (Assume that the red allele is dominant to the violet allele)?

Question : A cross section at midpoint of the middle piece of humansperm will show

Question : A cross in which an organism showing a dominant phenotype is crossed with the recessive parent in order to know its genotype is colled :

Question : A cross section at the mid point of middle piece of a human sperm will show:

Question : A cross between white-eyed female and red eyed male Drosophila gives red-eyed females and white-eyedfemales and red-eyed males.This is due to :

Question : A cross between two tall plants resulted in offspring having few dwarf plants. What would be the genotypes of both the parents ?

Question : A cross between two tall plants resulted in offspring having few dward plants. What would be genotypes of both the parents?

Question : A cross between pure tall, green seeds and pure dwarf yellow seeds is crossed with pure dwarf and green seeds then number of phenotype produced are

Question : What the cross between two parents differing in a single character is called ?

Question : A cross between hybrid and a recessive parent (Tt xx t t) gives a ratio of

Question : A cross between hybrid with a double recessive pure plant is called _____

Question : A cross between F_(1) plant with a plant which is phenotypically and genotypicallysimilar to any parent is called

Question : A cross between AaBB x aaBB produces the offspring with genotypes :

Question : A cross between a plant heterozygous for two factors and a plant recessive for both the factors, gives a phenotypic ratio of

Question : A cross between a organism with dominant phenotype and a homozygous recessive to know the genotype of former is called :

Question : A couple without children can have a child by modern research.

Question :A crane had DDT level as 5 ppm in its body. What would happen population of such birds ? Explain giving reasons

Question : A couple with blood groups A and B may have children with blood group :

Question : A crane had DDT level as 55m is its body . What would be happen to the populationof suchbirds ?

Question : A couple whose sons are colour-blind with .AB. blood group, identify the parents from the following.

Question : A couple has two daughters. The blood group of the husband and wife is 'o'. Whether any changes in blood group will occur if they have two sons instead of daughter. Substantiate your answer

Question : A couple has two daughters. The blood group of the husband and wife is 'o'. What is the possible blood groups the children should have

Question : A couple has three children : a 14 - year -old daughter and two sons that are 12 and 10 years old.If the mother and daughter are both known tohave a genetic disorder what would the the Pedigree of this family look like?

Question : A couple has five daughter and are expecting the sixth child. The chances of getting son are

Question : A couple has only A and O blood group children in 3:1 ratio if father's blood group is A, mother's blood group is

Question : A couple had two sons, one was colour blind while the other wasn't. They also had a colour blind daughter. Which statement about this couple is true?

Question : A country with a high rate of population growth took measures to reduce it. The figures shows age-sex pyramids of populations A and B twenty years apart. Select the correct interpretation about them: