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CBSE XII
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Biology
In Mendel’s breeding experiment on garden pea, the offspring in $F_2$ generation are obtained in the ratio of $25\%$ pure yellow pod, $50\%$ hybrid green pods and $25\%$ green pods. State a)Which pod is dominant? b)The phenotype of the individuals of $F_1$ generation. c)Work out the cross.
cbse
class12
biology
botany
sec-c
asked
Dec 2, 2016
by
meena.p
1
answer
What are heterogametes? What do we call these gametes individually?
cbse
class12
biology
zoology
sec-c
asked
Dec 2, 2016
by
meena.p
1
answer
Expand MOET. How is it carried out?
cbse
class12
biology
zoology
sec-b
asked
Dec 2, 2016
by
meena.p
1
answer
Why is secondary succession faster than primary succession?
cbse
class12
biology
botany
sec-b
asked
Dec 2, 2016
by
meena.p
1
answer
Differentiate between active and passive immunity.
cbse
class12
biology
zoology
sec-b
asked
Dec 2, 2016
by
meena.p
1
answer
The map distance between a certain organisms genes A and B is 4 units, between B and C is 5 units and between C and D is 8 units. Which one of the gene pair will show more recombination frequency? Give reason. and Mention four reasons why Drosophila was chosen by Morgan for his experiments in genetics.
cbse
class12
biology
zoology
sec-b
asked
Dec 2, 2016
by
meena.p
1
answer
Define ‘oestrous’ and ‘menstrual cycle’.
cbse
class12
biology
zoology
sec-b
asked
Dec 2, 2016
by
meena.p
1
answer
Name any two man made eco system.
cbse
class12
biology
zoology
sec-a
asked
Dec 2, 2016
by
meena.p
1
answer
What is bio fortification?
cbse
class12
biology
botany
sec-a
asked
Dec 2, 2016
by
meena.p
1
answer
Who isolated restriction enzymes for the first time?
cbse
class12
biology
botany
sec-a
asked
Dec 2, 2016
by
meena.p
1
answer
What is the cause of speciation according to Hugo de Vries?
cbse
class12
biology
zoology
sec-a
asked
Dec 2, 2016
by
meena.p
1
answer
Name one trait each in human and drosophila whose genes are located on the *** chromosome.
cbse
class12
biology
zoology
sec-a
asked
Dec 2, 2016
by
meena.p
1
answer
Describe the exponential growth model of a diagram along with a curve.and Describe the logistic growth model of population along with a suitable curve. Why is this curve more realistic?
cbse
class12
biology
zoology
sec-e
asked
Dec 2, 2016
by
meena.p
1
answer
Describe the inheritance of the flower colour in snap dragon. Taking the examples of ABO blood group types of humans, explain the phenomenon of multiple alleles and co dominance.
cbse
class12
biology
botany
sec-e
asked
Dec 2, 2016
by
meena.p
1
answer
Distinguish between asexual reproduction and sexual reproduction. Why is vegetative reproduction also considered a type of asexual reproduction? Which is a better mode of reproduction: Sexual or Asexual. Why? Draw an embryo sac of the flowering plant and label (i) central cell (ii) chalazal end (iii) synergids. Name the cell that develops an embryo sac. Mention the role played by various cells of embryo sac.
cbse
class12
biology
zoology
sec-e
asked
Dec 2, 2016
by
meena.p
1
answer
Joy loves to play football and was selected as a captain of the school team for the district level tournament. He also does social work . He attended blood donation camp to donate blood and he came to know that he was HIV positive. He lost interest in games and refused to play or study. He started counting his days. He remained absent from the school for a long time. The Biology teacher visited his house and counseled him. Joy was back to school and played the tournament also.a.What sense of responsibility did the teacher exhibit?b.A person detected to be HIV positive should be isolated in the society. Do you agree? Why or why not?c.How is AIDS not spread?
cbse
class12
biology
zoology
sec-d
value-based-question
asked
Dec 2, 2016
by
meena.p
1
answer
With the help of a diagram, represent the energy flow through different trophic level.
cbse
class12
biology
zoology
sec-c
asked
Dec 2, 2016
by
meena.p
1
answer
How does the shape of the pyramid reflect the growth status of a population?
cbse
class12
biology
zoology
sec-c
asked
Dec 2, 2016
by
meena.p
1
answer
What is RNA silencing? How is this strategy used to create pest resistant plants?
cbse
class12
biology
botany
sec-c
asked
Dec 2, 2016
by
meena.p
1
answer
Name the genes responsible for making Bt.cotton plants resistant to boll worm attack. How do such plants attain resistance against bollworm attack?
cbse
class12
biology
botany
sec-c
asked
Dec 2, 2016
by
meena.p
1
answer
Mention the important properties which a good vector must possess. The important properties of a good vector are:
cbse
class12
biology
botany
sec-c
asked
Dec 2, 2016
by
meena.p
1
answer
Fill in the blanks a,b,c,d,e and f in the following table:
cbse
class12
biology
botany
sec-c
asked
Dec 2, 2016
by
meena.p
1
answer
What is micro propagation? Why are plants produced by this technique called soma clones? Name any two food plants that are produced on commercial basis using this method?
cbse
class12
biology
botany
sec-c
asked
Dec 2, 2016
by
meena.p
1
answer
What are cannabinoids? From which plant are cannabinoids obtained? Which part of the body is affected by consuming these substances?
cbse
class12
biology
zoology
sec-c
asked
Nov 30, 2016
by
meena.p
1
answer
State Hardy-Weinberg principle. When there is a disturbance in the Hardy-Weinberg equilibrium, what would it result in? According to this principle, what is the sum total of all allelic frequencies?
cbse
class12
biology
botany
sec-c
asked
Nov 30, 2016
by
meena.p
1
answer
Give six points of difference between DNA and RNA in their structural chemistry and their function.
cbse
class12
biology
zoology
sec-c
asked
Nov 30, 2016
by
meena.p
1
answer
A woman with blood group “O” marries a man with “AB” blood group a)Work out all the possible phenotypes and genotypes of progeny. b)Discuss the kind of dominance in parents and progeny in their case.
cbse
class12
biology
zoology
sec-c
asked
Nov 30, 2016
by
meena.p
1
answer
Differentiate between tubectomy and vasectomy.Mention the techniques that are employed in the following cases: a)Transfer of ovum collected from a donor into the fallopian tube of another female who cannot produce ova but can provide suitable environment for fertilization and development. b) Embryo is formed in the laboratory in which sperm is directly injected into the ovum. c)Semen collected either from husband or healthy donor is artificially introduced either into the ****** or uterus.
cbse
class12
biology
zoology
sec-c
asked
Nov 30, 2016
by
meena.p
1
answer
“Lichens are considered good examples of obligate mutualism”. Comment.
cbse
class12
biology
zoology
sec-b
asked
Nov 30, 2016
by
meena.p
1
answer
What are statins? Where are they formed from?
cbse
class12
biology
zoology
sec-b
asked
Nov 30, 2016
by
meena.p
1
answer
Differentiate between two types of tumours.
cbse
class12
biology
zoology
sec-b
asked
Nov 30, 2016
by
meena.p
1
answer
Give two reasons why both the strands of DNA are not copied during DNA replication.
cbse
class12
biology
zoology
sec-b
asked
Nov 30, 2016
by
meena.p
1
answer
Draw the structure of the microsporangium with a neatly labeled diagram.
cbse
class12
biology
zoology
sec-b
asked
Nov 30, 2016
by
meena.p
1
answer
Why do leaves of xerophytes contain sunken stomata?
cbse
class12
biology
botany
sec-a
asked
Nov 30, 2016
by
meena.p
1
answer
Name the substance used as a medium in gel electrophoresis.
cbse
class12
biology
botany
sec-a
asked
Nov 30, 2016
by
meena.p
1
answer
When is the tumour referred to as malignant?
cbse
class12
biology
botany
sec-a
asked
Nov 30, 2016
by
meena.p
1
answer
Give the initiation codon for protein synthesis. Name the amino acid it codes for.
cbse
class12
biology
botany
sec-a
asked
Nov 30, 2016
by
meena.p
1
answer
Name the phenomenon that occurs when homologus chromosomes do not separate during meiosis.
cbse
class12
biology
zoology
sec-a
asked
Nov 30, 2016
by
meena.p
1
answer
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