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Worksheetsscience 2
Total questions: 23
Worksheet time: 12mins
According to Mendel alleles have the following character:
Pair of genes
Responsible for character
Production of gametes
Recessive factors
9 : 3 : 3 : 1 ratio is due to ______.
Segregation
Crossing over
Independent assortment
Recessiveness.
The region of the chromosome where the spindle fibres get attached during cell division:
Chromomere
Centrosome
Centromere
Chromonema
The centromere is found at the centre of the ______ chromosome.
Telocentric
Metacentric
Sub – metacentric
Acrocentric.
The units form the backbone of the DNA.
5 carbon sugar
Phosphate
Nitrogenous bases
Sugar phosphate
Okazaki fragments are joined together by ______.
Helicase
DNA polymerase
RNA primer
DNA ligase.
The number of chromosomes found in human beings are:
22 pairs of autosomes and 1 pair of allosomes.
22 autosomes and 1 allosome
46 autosomes
46 pairs autosomes and 1 pair of allosomes.
The loss of one or more chromosome in ploidy is called ______.
Tetraploidy
Aneuploidy
Euploidy
Polyploidy
Biogenetic law states that _____.
Ontogeny and phylogeny go together.
Ontogeny recapitulates phylogeny.
Phylogeny recapitulates ontogeny.
There is no relationship between phylogeny and ontogeny.
The ‘use and disuse theory’ was proposed by _____.
Charles Darwin
Ernst Haeckel
Jean Baptiste Lamarck
Gregor Mendel.
Paleontologists deal with _____.
Embryological evidences
Fossil evidences
Vestigial organ evidences
All the above.
The best way of direct dating fossils of recent origin is by _____.
Radio – carbon method
Uranium lead method
Potassium – argon method
Both (a) and (c).
The term Ethnobotany was coined by _____.
Khorana
J.W. Harshberger
Ronald Ross
Hugo de Vries
Which method of crop improvement can be practised by a farmer if he is inexperienced?
clonal selection
mass selection
pure line selection
hybridisation.
Pusa Komai is a disease resistant variety of:
sugarcane
rice
cow pea
maize
Himgiri developed by hybridisation and selection for disease resistance against rust pathogens is a variety of ______.
chilli
maize
sugarcane
wheat.
The miracle rice which saved millions of lives and celebrated its 50th birthday is:
IR 8
IR 24
Atomita 2
ponni
Which of the following is used to produce products useful to humans by biotechnology techniques?
enzyme from organism
live organism
vitamins
both (a) and (b).
We can cut the DNA with the help of:
scissors
restriction endonucleases
knife
RNAase
rDNA is a ______.
vector DNA
circular DNA
recombinant of vector DNA and desired DNA
satellite DNA
DNA fingerprinting is based on the principle of identifying sequences of DNA:
single-stranded
mutated
polymorphic
repetitive
Organisms with a modified endogenous gene or a foreign gene are also known as ______.
transgenic organisms
genetically modified
mutated
both (a) and (b).
In hexaploid wheat (2n = 6x = 42) the haploid (n) and the basic(x) number of chromosomes are:
n = 7 and x = 21
n = 21 and x = 21
n = 1 and x = 1
n = 21 and x = 7
