Which one ofthe following is reptilian ancestor of birds
Hesperornis
Archaeopteryx
Ichthyornis
Lycaenops
B.
Archaeopteryx
D.
Lycaenops
The first fossil birds found in the rocks of Jurassic period belonged to genera Archaeopteryx and Archaeornis. These are considered as reptilian ancestors of birds. It was about the size of a crow and possessed feathers and wings but had a long reptilian tail very much unlike the modern birds and a toothed beak. Fossils ofHesperornis, an aquatic diving bird, and Ichthyornis, a powerful flying bird, have been found from Cretaceous.
One out of the following is not responsible for biodiversity loss
Alien species invasion
Co-extinction
Ex-situ conservation
Deforestation
Which is genetically not possible
Haemophilic father transfers the haemophilic gene to his son.
Haemophilic father transfers the haemophilic gene to his daughter.
Carrier mother transfers the haemophilic gene to her son.
Carrier mother transfers the haemophilic gene to her daughter
Which organism is used to transfer T-DNA
Streptomyces hygroscopicus
Agrobacterium tumefaciens
Salmonella typhi
Escherichia coli
Primary endosperm nucleus (PEN) is formed by the fusion of
2 polar nuclei + I synergid cell nucleus
I polar nucleus + I antipodal cell nucleus + I synergid cell nucleus
2 polar nuclei+ I male gamete nucleus
2 antipodal cell nuclei + I male gamete nucleus
Barr body is missing in the female suffering from
Huntington's disease
Tay-sach's disease
Klinefelter's syndrome
Turner's syndrome.
Which of the following set of options is used in translation
hnRNA, tRNA, rRNA
mRNA, tRNA, rRNA
mRNA, tRNA, hnRNA
hnRNA, rRNA, tRNA
In rabbits, the gene for grey fur (G) is dominant over that for black fur (g). In a litter, if 50% rabbits are grey, then the possible parental cross combination is
GG x Gg
gg X gg
GG x GG
Gg x gg
Select the correct explanation for the labels A, B, C and D
A represents the fertilised zygote.
B represents the stage of morula formation.
C represents the blastocyst.
D represents the blastocyst implantation
Which of the following pathogens is not transmitted by a vector
Salmonella typhi
Alpha virus
Plasmodium
Wuchereria bancrofti
