class 12 2019 geography question paper
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Section – A
Gel electrophoresis is used in DNA profiling. which of the following is in incorrect statement regarding gel Electrophoresis ?
(a) An Electric current is passed through the gel matrix to separate DNA molecules.
(b) DNA Molecules move towards the -ve electrode.
(c) different size DNA molecules form distinct bands on the gel.
(d) Larger DNA molecules move through the gel more slowly than the smaller DNA molecules.
‘ Saheli’ is a non steroidal preferred Female Contraceptive because it can be taken:
(a) once a month
(b) once a week
(c) once in a fortnight
(d) continuously only for 7 days in a month.
the figure depicts the proportionate number of species major taxa of vertebrates at the global level.
‘A’In the given diagram represent
(a) mammals
(b) Birds
© fish
(d) Amphibiansllinat
for the lac-operon to be operational in E.coil, lactose in its culture medium acts as
(a) a regulator
(b) an operator
(c) an inducer
(d) repressor
Goa Board HSSC Model Papers 2019 | GBSHSE Class 12th Question Paper
name the breeding process that helped In developing resistance in mung beans to yellow mosaic virus and powdery mildew.
right to ways in which meiosis contributes to genetic variation during gametogenesis.
In organism exhibiting internal fretilization the male gametes are motile. how was the non motile male gametes in seed plants reached to the female gametes ?
draw a labeled diagram of nucleosome.
Section- B
write the differences in the replicating strands in a replicating fork.
why do majority of flowering plants producting harmaphrodite flowers prefer cross pollination to self pollination ? Give a Reason. maintain any two devices developed by them To encourage cross pollination Pollination.
genetic variability is the root of any breeding programme. explain the importance of genetic variability in the breeding programme.
you are asking to prepare a plan of an artificial cloning vector for a biotechnology experiment. Name the different essential components that you will suggest for the required cloning vector and why ?
name and state the functions of the two factors RNA polymerases is associated with, to carry transcription in bacteria.
How do cry genes when incorporated in cotton plants make it bol bollworm resistant ? explain.
A cut his foot on a rusty metal while Playing football and had to go to the doctor to have stitches. the doctor also give him an injection to prevent him from contracting a certain disease.
(a) name the disease the doctor feared the boy might contact.
(b) what did the doctor inject and why was n immediate need for such an injection ?
(c) state the kind of immunity the boy could gain from the injection.