ISC (Commerce)
ISC (Arts)
ISC (Science)
Academic Year: 2017-2018
Date: March 2018
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Give a significant point of difference between the oestrous and menstrual cycles.
Chapter: [3] Human Reproduction
Name the causative organism and preventive measures for Typhoid
Chapter:
If the haploid number of chromosomes in a plant species is 20, how many chromosomes will be present in the cells of the shoot tip?
Chapter:
Name a plant which flowers every twelve years.
Chapter: [2] Sexual Reproduction in Flowering Plants
Write the complete name of the diagnostic test for AIDS.
Chapter: [4] Reproductive Health
Name the terminal stage of ageing in the life cycle of plants.
Chapter: [2] Sexual Reproduction in Flowering Plants
Which organisms constitute the last trophic level?
Chapter: [16] Ecosystem
Length of DNA with 23 base pairs is :
(1) 78.4 Å
(2) 78.2 Å
(3) 78 Å
(4) 74.8 Å
Chapter:
Opium is obtained from :
(1) Papaver somniferum
(2) Cannabis sativa
(3) Erythroxylum coca
(4) Datura metal
Chapter:
According to Abiogenesis, life originated from
(1) Non-living matter
(2) Pre-existing life
(3) Oxygen
(4) Extra-terrestrial matter
Chapter:
The largest unit in which gene flow is possible is :
(1) Organism
(2) Population
(3) Species
(4) Genes
Chapter: [8] Evidences and Theories of Biological Evolution
Give one significant contribution of the given scientists:
P. Maheshwari
Chapter: [11] Strategies for Enhancement in Food Production
Give one significant contribution of the given scientist
E. Wilson
Chapter: [17] Biodiversity and Its Conservation
Give one significant contribution of the given scientists:
M. S. Swaminathan
Chapter:
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Give one significant contribution of the given scientists
H. Boyer
Chapter:
What is a 'biopatent'? Explain it with a suitable example.
Chapter:
Define Parthenocarpy
Chapter: [2] Sexual Reproduction in Flowering Plants
Give a reason for the Following:
Pollen grains of wind-pollinated flowers are produced in large quantities.
Chapter: [2] Sexual Reproduction in Flowering Plants
Give a reason for the following:
Equilibrium of a forest ecosystem can be disturbed by uncontrolled hunting of big predators.
Chapter:
A woman with blood group O married a man with blood group AB shows the possible blood groups of the progeny. List the alleles involved in this inheritance.
Chapter:
If the mother is a carrier of colour blindness and the father is normal, the possible genotype and the phenotype of the offspring of the next generation, with the help of a punnet square.
Chapter:
Give two characteristic features of Ramapithecus.
Chapter:
Give two characteristic features of Cro-Magnon man.
Chapter:
State any four measures to control noise pollution.
Chapter: [18] Environmental Issues
What do you mean by Biochemical Oxygen Demand (BOD)?
Chapter: [18] Environmental Issues
What is Biochemical Oxygen Demand significance in an aquatic ecosystem?
Chapter:
Give one significant difference between Humoral immunity and cell-mediated immunity.
Chapter:
Give one significant difference between Benign tumour and malignant tumour
Chapter:
Give four causes of infertility in males.
Chapter: [4] Reproductive Health
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Draw a labelled diagram of L.S. of human testis.
Chapter: [3] Human Reproduction
Explain gene therapy, with reference to the treatment of SCID.
Chapter:
Study the table given below. Do not copy the table, but write the answers in the correct order
| Scientific Name | Commercial Product | Use |
| (a) ____________ | Streptokinase | (b) ____________ |
| Monascus purpureus | (c) ____________ | (d) ____________ |
| (e) ____________ | Lactic acid | (f) ____________ |
Chapter:
Describe the tissue culture technique in plants.
Chapter: [11] Strategies for Enhancement in Food Production
Define Reproductive health
Chapter: [3] Human Reproduction
Define Hotspots.
Chapter: [17] Biodiversity and Its Conservation
Define Ramsar Sites.
Chapter: [17] Biodiversity and Its Conservation
What is Red Data Book?
Chapter: [17] Biodiversity and Its Conservation
Define Biodiversity.
Chapter: [17] Biodiversity and Its Conservation
Define Eutrophication.
Chapter: [17] Biodiversity and Its Conservation
Define PAR(photosynthetically active radiation)
Chapter:
Describe post-transcriptional processing of RNA in eukaryotes
Chapter:
Describe Avery, McLeod and McCarty’s experiment. State its significance.
Chapter:
What does PCR stand for? Describe the different steps of PCR
Chapter: [13] Principles and Processes of Biotechnology
Give an account of the Blue-White Method of selection of recombinants.
Chapter: [13] Principles and Processes of Biotechnology
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CISCE previous year question papers Class 12 Biology (Theory) with solutions 2017 - 2018
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