Half Yearly Revision Assignment
XII BIOLOGY
Chapter-1 to 12
Section-A
Q1.What is reproduction?
Q2.Name the two main types of reproduction?
Q3.Name two organisms in which asexual reproduction occurs by binary fission?
Q4.What is clone?
Q5.What is funiculus?
Q6.What is nucellus?
Q7.What is function of tapetum?
Q8.Write two major functions each of testis and ovary?
Q9.Draw the labeled diagram of Graafian follicle.
Q10.What is menstrual cycle? Which hormones regulate menstrual cycle?
Q11.Name the birth hormone?
Q12.What is the function of Scrotum?
Q13.Where are sperms stored in a male?
Q14.Name the fluid which protects embryo.
Q15.Expand MTP.
Q16.Write full form of RTI.
Q17.List the main reasons of infertility.
Q18.Mention two contrasting traits related to pea seeds noted by Mendel.
Q19.What are pleiotropic genes?
Q20.Write possible genotypes of human having blood groups ‘B’ and ‘O’.
Q21.Name two purines of DNA molecule.
Q22.Name the two pyrimidines of mRNA.
Q23.Which base triplets code for amino acid valine?
Q24.What are the end products of the experiment of miller?
Q25.What is divergent evolution?
Q26.What is biopsy?
Q27.What are antigens?
Q28.Name the alkaloid that prevents spindle formation during mitosis.
Q29.What is somatic embryo?
Q30.Name the two vitamins produced by microbial fermentation.
Q31.What are antibiotics?
Q32.What is transformation?
Q33.What are plasmids?
Q34.What are GMOs?
Q35.Define antibiotics?
Q36.The incidence of which disease has gone down in a community in UK due to use of antenatal
diagnosis?
Section-B
Q1.What is life span? Give approximate life span of elephant, dog, tortoise and banyan tree?
Q2.Differentiate between binary fission and budding?
Q3.Differentiatee between autogamy and allogamy.
Q4.What is senescence?
Q5.Draw a neat labeled sketch of the section of a mature ovule.
Q6.What are the characteristics of wind pollinated flower?
Q7.What are the characteristics of insect pollinated flowers?
Q8.What is significance of pollination?
Q9.What is corpus luteum? Under what conditions it undergoes degeneration?
Q10.Name the hormones which stimulate the secretion of ovarian hormones. What would happen if the
blood concentration of ovarian hormone increases?
Q11.Differentiate between morula and blastula?
Q12.What are the test-tubes babies?
Q13.Write the names of two bacterial diseases that are sexually transmitted. Name their causative
organisms.
Q14.Define law of dominance.
Q15.Differentiate between back-cross and test-cross.
Q16.Haemophilia victims are mostly men. Very rarely women are affected by this disorder. Explain , why
is it so?
Q17.Which one is the genetic material ?How does it expresses biological information?
Q18.Who coined the term “Genetic Code”? What does it mean?
Q19.Describe one example of adaptive radiation.
Q20.What is the role of sun in the origin of life?
Q21.Differntiate between benign and malignant tumour.
Q22.Write the important measures to maintain good health.
Q23.Azotobacter culture is added to the soil before sowing maize. How it increases the yield of maize?
Q24.Why the leguminous plants cultivated as green manure crop?
Q25.What is recombinant DNA technology?
Q26.What is microinjection?
Q27.What is Chemeric DNA?
Q28.Why are yeasts used extensively for functional expression of eukaryotic genes?
Section-C
Q1.Discuss the significance of vegetation propagation?
Q2.(a)If the chromosome numbers in meiocytes of human being, rat, elephant, rice, butterfly and onion
are 46,42,56,24,380 and 32 respectively. What will be the chromosome numbers in gametes of these
species?
(b)If the chromosome numbers in the gametes of house fly, dog, cat, potato, apple and maize are:
06,39,19,24,17 and 10 respectively. What will the chromosome numbers in meiocytes of these
organisms?
Q3. Mention the mode of asexual reproduction in Penicillium, yeast, hydra, sponges, bryophyllum and
potato?
Q4.Give the need and significance of pollination. Mention the two main types of pollination?
Q5.Why is the fertilisation in case of angiosperms referred to as double fertilisation ? Give the
significance of double fertilization?
Q6.Write three points of similarities between spermatogenesis and oogenesis?
Q7.Draw a flow chart to show hormonal control of female reproductive system.
Q8.What are the consequences of population explosion?
Q9.Enunciate Mendel’s Law of Segregation with help of a monohybrid cross.
Q10.Write the various causes of genetic disorders in humans.
Q11.What are the characteristics of a genetic material?
Q12.While proposing the double helical structure of DNA Watson and Crick had immediately proposed a
scheme for replication of DNA ,quote their original statement.
Q13.Recall the experiment set up by Miller. What is the significance of his findings?
Q14.Distinguish between B-cells and T-cells.
Q15.Discuss the role of selection in crop improvement.
Q16.Discuss the role of colchicines in polyploid breeding.
Q17.Explain the basis of biological control of weeds.
Q18.What are palindromic nucleotide sequences?
Q19.How a transgenic plant got itself protected from nematode infestation?
Q20.What are transgenic bacteria? Illustrate using any one example.
Section-D
Q1.”The unicellular organisms which reproduce by binary fission ,are considered immortal.”Justify.
Q2.What is scourge of the water bodies or “the terror of Bengal”?
Q3.What develops into a microspore mother cell in a flower? Trace the development of this cell into a
pollen grain which is ready for germination?
Q4.Trace the events that would take place in flower from the time of the pollen grains of the same
species fall on the stigma up to the completion of fertilization?
Q5.Distinguish between spermatogenesis and oogenesis.
Q6.Describe the changes in the following organs in the different phases of the menstrual cycle :
(i)Ovaries
(ii)Oviducts
(iii)Uterus
Q7.What do you mean by reproductive health? Suggest some measures for building up good
reproductive health of society.
Q8.Give an account of the sexually transmitted diseases and their impact on reproductive health.
Q9.Discuss Mendel’s Law of Independent Assortment.
Q10.In man four types of blood groups A,B,AB and O are controlled by three alleles of a gene .What is
the mechanism of inheritance of the blood group?
Q11.Describe the evidences of evolution from comparative anatomy and morphology.
Q12.Name the causative organism, symptoms and mode of infection of typhoid and pneumonia.
Q13.How honey bees are used in the extraction of honey?
Q14.How the role of plant breeding is useful in food production?
Q15.Give an account of sewage treatment.
Q16.Write the procedure of separation and isolation of DNA fragments.
Q17.How are transgenic animals useful to us?