CBSE class 12th Biology 1 Marks Important Questions

CBSE class 12th Biology 1 Marks Important Questions

12th CBSE 12th Exam Tips 12th Papers

Central Board of Secondary Education every year provides various important questions for the students they also provide the sample papers for providing the students to analyse them their final procedure so it is too much important for the students to go through this papers for their preparations

Here in the below article all the important questions of 1 marks from the Biology for the session 2018

Biology important questions of 1 marks

@: List any two economically important products for humans obtained from Apis indica.

@: Name the Indian variety of rice patented by an American company.

@: What role do macrophages play in providing immunity to humans?

@: Name the world’s most problematic aquatic weed. What is the nature of the water body in which the weeds grow abundantly?

@: What is the major difference you observe in the offsprings produced by asexual reproduction and in the progeny produced by sexual reproduction?

@: Mention any two significant roles predation plays in nature.

@: Why is the polar region not a suitable habitat for tiny humming birds?

@: Pick out the ancestral line of angiosperms from the list given below:

Conifers, seed ferns, cycads, ferns.

@: When and why do some animals go into hibernation?

@: What is the economic value of Saccharum officinarum?

@: When and at what end does the ‘tailing’ of hnRNA take place?

@: Name the type of flower which favours cross pollination.

@: Name the type of cells the AIDS virus enters into after getting in the human body.

@: According to Hardy–Weinberg’s principle, the allele frequency of a population remains constant. How do you interpret the change of frequency of alleles in a population?

@: A boy of ten years had chicken-pox. He is not expected to have the same disease for the rest of his life. Mention how it is possible.

@: What is it that prevents a child to suffer from a disease he/she is vaccinated against? Give one reason.

@: Why is the enzyme cellulase used for isolating genetic material from plant cells but not for animal cells?

@: Name a molecular diagnostic technique to detect the presence of a pathogen in its early stage of infection.

@: If 8 individuals in a laboratory population of 80 fruit flies died in a week, then what would be the death rate of population for the said period?

@: Mention one positive and one negative application of amniocentesis.

@: Mention the information that the health workers derive by measuring BOD of a water body.

@: Name the enzyme involved in the continuous replication of DNA strand. Mention the polarity of the template strand.

@: Offsprings derived by asexual reproduction are called clones. Justify giving two reasons.

@: Mention the site where syngamy occurs in amphibians and reptiles respectively.

@: How is snow-blindness caused in humans?

@: Name one autosomal dominant and one autosomal recessive Mendelian disorder in humans.

@: How is the action of exonuclease different from that of endonuclease?

@: India has more than 50,000 strains of rice. Mention the level of biodiversity it represents.

@: Which one of the following is the baker’s yeast used in fermentation?

Saccharum barberi, Saccharomyces cerevisiae, Sonalika.

@: Why is bagging of the emasculated flowers essential during hybridisation experiments?

@: A bilobed, dithecous anther has 100 microspore mother cells per microsporangium. How many male gametophytes this anther can produce?

@: Mention two functions of the codon AUG.

@: Name the scientist who disproved spontaneous generation theory.

@: In what way are monocytes a cellular barrier in immunity?

@: Why hnRNA is required to undergo splicing?

@: The microscopic pollen grains of the past are obtained as fossils. Mention the characteristic of the pollen grains that makes it happen.

@: How does colostrum provide initial protection against diseases to new born infants? Give one reason.

@: When and at what end does the ‘tailing’ of hnRNA take place?

@: When and why do some animals like snails go into aestivation?

@: What is the economic value of Spirulina?

@: What was the speciality of the milk produced by the transgenic cow Rosie?

@: How do neutrophils act as a cellular barrier to pathogens in humans?

@: Mention any two significant roles predation plays in nature.@: What is biopiracy?

@: Mention two advantages of preferring CNG over diesel as an automobile fuel.

@: Write the probable differences in the eating habits of Homo habilis and Homo erectus.

@: What causes speciation according to Hugo de Vries?

@: When and why do some animals like frogs hibernate?

@: List any two economically important products for humans obtained from Apis indica.

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