Biology (Theory) Set 1 2017-2018 ISC (Commerce) Class 12 Question Paper Solution

Give a significant point of difference between Oestrous and Menstrual cycle.

Name the causative organism and preventive measures for Typhoid

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?

Name a plant which flowers every twelve years.

Write the complete name of the diagnostic test for AIDS.

Name the terminal stage of ageing in the life cycle of plants

Which organisms constitute the last trophic level?

What is emasculation?

Length of DNA with 23 base pairs is :

(1) 78.4 Å

(2) 78.2 Å

(3) 78 Å

(4) 74.8 Å

Opium is obtained from :

(1) Papaver somniferum

(2) Cannabis sativa

(3) Erythroxylum coca

(4) Datura metal

According to Abiogenesis, life originated from

(1) Non-living matter

(2) Pre-existing life

(3) Oxygen

(4) Extra-terrestrial matter

The largest unit in which gene flow is possible is :

(1) Organism

(2) Population

(3) Species

(4) Genes

Give one significant contribution of the given scientists:

P. Maheshwari

Give one significant contribution of the given scientist

E. Wilson

Give one significant contribution of the given scientists:

M. S. Swaminathan

Give one significant contribution of the given scientists

H. Boyer

What is a 'biopatent'? Explain it with a suitable example.

Define Parthenocarpy

Give a reason for the Following:

Pollen grains of wind-pollinated flowers are produced in large quantities.

Give a reason for the Following:

Equilibrium of a forest ecosystem can be disturbed by uncontrolled hunting of big predators.

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.

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

Define lifespan. Give the lifespan of an elephant

Give two characteristic features of Ramapithecus.

Give two characteristic features of Cro-Magnon man

List any four effects of global warming

State any four measures to control noise pollution

What do you mean by Biochemical Oxygen Demand (BOD)?

What is Biochemical Oxygen Demand significance in an aquatic ecosystem?

Give one significant difference between Humoral immunity and cell-mediated immunity.

Give one significant difference between Benign tumour and malignant tumour

Give four causes of infertility in males.

Draw a labelled diagram of L.S. of human testis.

Draw a labeled diagram of a mature embryo sac.

Explain gene therapy, with reference to the treatment of SCID

Study the table given below. Do not copy the table, but write the answers in the correct order

Explain industrial melanism.

Describe the tissue culture technique in plants

Define Spermatogenesis.

Define Reproductive health

Define Amenorrhea

Define Hotspots

Define Ramsar Sites

What is Red Data Book?

Define Biodiversity.

Define Eutrophication.

Define PAR(photosynthetically active radiation)

Describe post-transcriptional processing of RNA in eukaryotes

Describe Avery, McLeod and McCarty’s experiment. State its significance.

Write a short note on Chipko Movement.

Write a short note on Joint forest management.

What does PCR stand for? Describe the different steps of PCR

Give an account of the Blue-White Method of selection of recombinants