ISC (Science)
Academic Year: 2019-2020
Date: मार्च 2020
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- This paper comprises TWO PARTS - Part I and Part II.
- Answer all questions.
- Part I consists of one question of 20 marks having six subparts.
- Part II consists of Sections A, B and C.
- Section A consists of seven questions of two marks each.
- Section B consists of seven questions of three marks each, and Section C consists of three questions of five marks each.
- Section C consists of three questions of five marks each.
- Internal choices have been provided in two questions in Section A, two questions in Section B and in all three questions of Section C.
- The intended marks for questions or parts of questions are given in brackets [ ].
How many chromosomes are present in male gamete of a rat?
Chapter:
Name the disease-resistant variety of cowpea developed by plant breeding technique.
Chapter:
Name the vegetative propagule in the following:
Bryophyllum
Chapter: [1] Reproduction in Organisms
Which geological era was dominated by reptiles?
Chapter:
If 10 individuals in a laboratory population of 100 mice die during the period of one year, the death rate in this population will be ______.
110
0.01
0.1
90
Chapter:
The flowers which open their petals to expose their reproductive parts to allow pollination are called ______.
Cleistogamous
Geitonogamous
Chasmogamous
Autogamous
Chapter:
Which of the following is paired incorrectly:
Cyclosporin A - Trichoderma polysporum
Streptokinase - Saccharomyces cerevisiae
Swiss Cheese - Propionibacterium
Penicillin - Penicillium
Chapter:
The pathogen which causes Syphilis ______.
Neisseria
Chlamydia
Treponema
Papilloma virus
Chapter:
Give one significant contribution of the following scientists:
F. Griffith
Chapter:
Give one significant contribution of the following scientists:
P. Ehrlich
Chapter:
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Give a reason for the following:
Cyanobacteria increase the productivity in paddy fields.
Chapter:
Give a reason for the following:
The shape of the pyramid of biomass in an aquatic ecosystem is inverted.
Chapter:
Give one significant difference between the following:
Linkage and crossing over
Chapter:
Differentiate between transition and transversion.
Chapter:
Study the graph given below and answer the questions that follow:
- In the absence of predators which one of the two curves would appropriately depict the prey population? Give a reason.
- Time has been shown on the X-axis, and there is a parallel dotted line shown above. Explain the significance of this dotted line.
Chapter:
Draw a labelled diagram of a germinating pollen grain with at least four labellings.
Chapter:
Draw a labelled diagram of a mature human ovum with at least four labellings.
Chapter:
Write a short note on the contribution of Ahmed Khan of Bangalore.
Chapter:
Give three adaptations in organisms by which they avoid predation.
Chapter:
Describe the processes and products of decomposition.
Chapter:
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Write three effects of cultural eutrophication.
Chapter:
State three differences between homologous and analogous organs and give an example of each.
Chapter:
Give one example of homologous organs found in plants.
Chapter:
Give one example of analogous organs found in plants.
Chapter:
Describe the process of double fertilisation in angiosperms.
Chapter:
Give any four points of significance of double fertilization.
Chapter:
Explain important features of a stirred tank bioreactor.
Chapter:
Distinguish between asexual and sexual reproduction.
Chapter: [1] Reproduction in Organisms
Briefly describe the process of spermatogenesis.
Chapter: [3] Human Reproduction
Give an account of hormonal control of oogenesis.
Chapter:
Explain the various steps involved in recombinant DNA technology.
Chapter:
Explain the steps involved in the production of human insulin by Recombinant DNA technology.
Chapter:
Give an account of Meselson and Stahl’s experiment
Chapter:
What is the significance of Meselson and Stahl’s experiment?
Chapter:
Describe the Oparin Haldane theory of the origin of life.
Chapter:
The tadpole larva of amphibians resembles fishes. How does this observation support evolution?
Chapter:
Draw a labelled diagram to show the life cycle of Plasmodium.
Chapter:
Draw a labelled diagram to show replication of HIV in human cells.
Chapter:
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