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23251.

Question : A nucleoside differs from nucleotide is not having the :

Answer»

SUGAR
NITROGEN BASE
GLUCOSE
PHOSPHATE group

Answer :D
Discussion
23252.

Question : A nucleoside differs from a nucleotide in not having

Answer»

Sugar
Glucose
Nitrogen base
Phospahte Group

Answer :D
Discussion
23253.

Question : A nucleoside differs from a nucleotide . It lacks the :

Answer»

BASE
SUGAR
Phosphate group
HYDROXYL group

Answer :B
Discussion
23254.

Question : A nucleoside differs from a nucleotide. It lacks the

Answer»

base
sugar
phosphate GROUP
HYDROXYL group

Answer :C
Discussion
23255.

Question : A novel technique devised to produce vast quantities of strong and healthy plantlets by rapid vegetative multi under controlled conditions.

Answer»

ANTHER CULTURE
POLYMERASE CHAIN Reaction
MICROPROPAGATION
Protoplast fusion

Solution :Micropropagation
Discussion
23256.

Question : The strategy adopted to prevent infection of tobacco roots by the nematode Meloidegyne incognitia.

Answer»

SOLUTION :RNA INTERFERENCE is the phenomenon which INVOLVES the silencing of specific m RNA due to a complementary ds RNA molecule that binds to and PREVENTS TRANSLATION of the m RNA.
Discussion
23257.

Question : A normal women whose father was colourblind marries a colourblind man, what percentage of daughter would be colourblind ?

Answer»

0.5
0.25
0.75
1

Solution :0.25
Discussion
23258.

Question : A normal visioned woman, whose father is colour blind, marries a normal visioned man. What would be the probability of her (a) sons (b) daughters to the colour blind? Explain with the help of pedigree chart.

Answer»

SOLUTION :All daughters normal visioned, 50% of SONS are LIKELY to be COLOUR blind.
Discussion
23259.

Question : A normal woman, whose father had color blindness, married a normal man. What is the chance ofoccurrence of color blindness in the progeny?(a) 25 %(b)50 %(c) 100 %(d) 75%

Answer»

`25%`
`50%`
`100%`
`75%`

ANSWER :A
Discussion
23260.

Question : A normal visioned man whose father was coloured blind, marries a woman whose father was also colour blind. They have first child as a daughter. What are the chances that this child would be colour blind.

Answer»

0.25
0.5
1
zero percent

Answer :D
Discussion
23261.

Question : A normal visioned woman, whose father is colour blind, marries a normal visioned man. What would be probability of her sons and daughters to be colour blind ? Explain with the help of a pedigree chart.

Answer»

Solution :
= Daughters will be with NORMAL VISION. But 50% of the daughters will be CARRIER.(normal vision) 50% of the sons will be colour BLIND. And 50% of the sons will be with normal vision
Discussion
23262.

Question : A normal visioned girl has a normal visioned brother and a colour blind sister. Their parents are

Answer»

COLOUR BLIND father, CARRIER MOTHER
NORMAL visioned father, Colour blind mother
Carrier mother, normal visioned father
Colour blind father, colour blind mother

Answer :A
Discussion
23263.

Question : A normal male marries a colour blind woman. Which of the following statements is correct about thier progeny ?

Answer»

They will have normal daughter
50% of their daughter will be normal
50% of their sons will be COLOUR blind
50% of their sons will be CARRIERS and REST will be normal.

Solution :They will have normal daughter
Discussion
23264.

Question :A normal man marries a woman who is a carrier for colour blindness. What will be the phenotypes of the children born to them? Depict the phenotypes through a possible cross.

Answer»

Solution :50% BOYS and all the girls will be normal PHENOTYPICALLY but 50% girls will be carrier for DISEASE while 50% boys are EXPECTED to be colourblind.
Discussion
23265.

Question : A normal couple gives the birth to one haemophilic son and a normal daughter. Work out the cross to show the genotypes of parents and progeny.

Answer»

Solution :(1) Since one SON is haemophilic, his mother must be CARRIER.
(2) THEREFORE, genotype of mother is `X^(h)`. Father is normal, hence his genotype will be XY.
(3)
(4) From the cross, it is clear that one daughter and one son is normal while one son is haemophilic and one daughter is carrier.
Discussion
23266.

Question : A nonsense codon is :

Answer»

UAG
UAA
BOTH (A) AND (B)
UUU

Answer :C
Discussion
23267.

Question : A non- medullayedbaxon does not have

Answer»

SCHWANN cells.
nodes of Ranvier.
axolemma.
neurofibrils

Answer :B
Discussion
23268.

Question : A non bald man with hpertrichosis is married to a bald woman. What is the probability of the sons to have both baldness and hpeertrichosis

Answer»

1
0.5
0.25
Zero

Answer :A
Discussion
23269.

Question : A non-communicable disease is

Answer»

MEASLES
RABIES
Diphtheria
DIABETES

SOLUTION :Diabetes
Discussion
23270.

Question : A nitrogen - fixing microbe associated with Azolla is :

Answer»

ANABAENA
Sprirullina
Tolypothrix
Nostoc

Answer :A
Discussion
23271.

Question : A: Niche become general and broader during biotic succession. R: Species diversity increases but organic matter is decreased.

Answer»

If both Assertion &Reason are true and the reason is the corect EXPLANATION of the assertion , then mark (1)
If both Assertion & Reason are true but the reason, is not the correct explanation of the assertion , then mark (2)
If Assertion is true STATEMENT but Reason is false , them mark (3).
If both Asseration and Reason are false statements , then mark (4).

Answer :D
Discussion
23272.

Question : A nitrogen-fixing bacteria living in leaves of Rubiaceae and Mysinaceae is

Answer»

Rhizobium
Basillus
Beijerinckia
Xanthomonas

Answer :D
Discussion
23273.

Question : A newspaper report reads like this. Conventional agricultural products like cereals and other seeds may not be able to meet the demand of food according to the increase in population. So focus has to be shifted to alternative food sources like SCPs. What are the advantages of SCPs?

Answer»

Solution :Easy to grow
NUTRIENT rich
REDUCES environmental pollution
HIGH yield and biomass productino WITHINA short time
Less expensive
Discussion
23274.

Question : A newspaper report reads like this. Conventional agricultural products like cereals and other seeds may not be able to meet the demand of food according to the increase in population. So focus has to be shifted to alternative food sources like SCPs.What is SCPs?

Answer»

Solution :SINGLE Cell PROTEIN is a MICROBIAL biomass which is used as a food or FEED.
Discussion
23275.

Question : A new breed of sheep was developed in Punjab by crossing two different breeds of sheep. Name the two breeds which were crossed and the new breed developed.Study the table given below and fill in the blanks marked A,B,C and D

Answer»

SOLUTION :By using Bikaneri ewes and MARINO RAMS, the NEW breed Hisrable was DEVELOPED.
Discussion
23276.

Question : A new DNA molecule synthesized from preexistence DNA is called ……………………

Answer»

gamatogenesis
genolysis
REPLICATION
reproduction

Solution :replication
Discussion
23277.

Question : A 'new' variety of rice was patented by a foreign company, though such varieties have been present in India for a long time. This is related to

Answer»

BASMATI
Co-667
Lerma Rojo
Sharbati SONORA

SOLUTION :Basmati
Discussion
23278.

Question : [A]: Neurospora is an ideal genetic material for research. [R]: Because of its suitability in the studies of genetics contained within it.

Answer»

If both A and R are true and R is the correct EXPLANATION of A
If both A and R are true but R is not the correct explanation of A
If A is true and R is FALSE
If both A and R are false

Answer :A
Discussion
23279.

Question : (a) Net primary productivity - Apparent photosynthesis (b) Community productivity - Respiration (c) Primary productivity - Biomass (d) Gross primary productivity - Storage of biomass

Answer»


ANSWER :NET PRIMARY productivity - Apparent PHOTOSYNTHESIS
Discussion
23280.

Question : A natural sequence of developmental stages in the life cycle of an angiosperm is

Answer»

Cleavage - Fertilization - DIFFERENTIATION - FRUIT FORMATION
Pollination - Fertilization - Seed formation - Germination
Germination - Double fertilization - ENDOSPERM formation - Seed dispersal
Maturation - Mitosis - Differentiation - Fertilization.

Answer :B
Discussion
23281.

Question : (a) Natural selection operates when nature selects for fitness. Explain. (b) The rate of appearance of new forms in linked to the life span of an organism. Explain with the help of a suitable example.

Answer»

Solution :(a) Natural RESOURCES are limited, populations are stable in size, members of a population vary in characteristics even though they look superficially similar. Theoretically, population will increase exponentially but the population size in reality is limited thus leading to COMPETITION. Only the ones which are fit and adapt themselves are able to survive. They grow at the cost of others and flourish. This was called as natural selection by Darwin.
(b) According to Darwin, the fitness of an organism is MEASURED by its reproductive ability.
Also the appearance of new forms is linked to the life span of an organism. The greater its lifespan, the more it can reproduce and hence, greater new forms WOULD appear. This can be observed in the Development of dark-winged moth due to industrial melanism.
For example, industrial evidence : It is a case of natural selection. In England, it was observed before industrialisation that white-winged moth were more than dark-winged moth. But the situation became reversed after industrialisation. It was found that PREDATORS will spot and pick a moth against a contrasting background.
During pre-industrialisation, the tree trunks were covered by white lichens and on white- background dark coloured moth can be picked up, During post industrialisation, the tree trunks were covered by dark, dust, coal particles and became dark, on which white moth can easily be picked up. Thus, it was found that industrial melanism supports evolution by natural selection.
Discussion
23282.

Question : A neem product used as insect repellant is _______________

Answer»

Rotenone
Endrin
Parathione
Azadirachtin

Answer :D
Discussion
23283.

Question : A natural food web

Answer»

Contains only GRAZING food chains 
Contains several TROPHIC levels 
Is usually unstable 
All of the above 

SOLUTION :Is usually unstable
Discussion
23284.

Question : A: Natural fertilizer is used in organic farming. R : Ramesh Chandra Dagar used artificial farming.(A) Both A and R are true and R is correct explanation of A(B) Both A and R are true but R is not correct explanation of A(C) A is true but R is false.(D) A is false but R is true.

Answer»

Both A and R are true and R is CORRECT EXPLANATION of A
Both A and R are true but R is not correct explanation of A
A is true but R is false.
A is false but R is true. 

Answer :C
Discussion
23285.

Question :A national level approach to build up a reproductively healthy society was taken up in our country in.(A) 1950s(B) 1960s(C) 1980s(D) 1990s

Answer»

1950s
1960s
1980s
1990s

Solution :India is the first country of the WORLD who has initiated first implementation of universally accepted reproductive health as social goal at the national level. This programmes are called FAMILY planning. It was initiated in 1951 (1952) and it was reviewed in last decades from time to time.
The main responsibilities of reproductive health society is to bring awareness in PEOPLE about various reproduction RELATED matters and provide facilities for the same and to help in creating reproductive health in society.
Discussion
23286.

Question : (a) Name the sulcus which separates the following parts of cerebral hemisphere : (i) Frontal and parietal lobe (ii) Parietal and occipital lobe (b) Which part of neuron is present in cerebral cortex and cerebral medulla? (c) Name the area which controls voluntary activities of body.

Answer»

Solution :(a) (i) Central SULCUS (ii) Parieto-occipital sulcus
(b) Cerebral cortex has large collectio of cytons of the NEURONS. Cerebral medulla has axons of the neurons.
(c) Voluntary activities are CONTROLLED by general MOTOR AREA located in the precentral gyrus of frontal lobe of cerebrum.
Discussion
23287.

Question :(a) Name the scientist who called t-RNA an adapter molecule. (b) Draw a clover leaf structure of t-RNA showing the following: (i) tyrosine attached to its amino acid site (ii) anticodon for this amino acid in its correct site (codon for tyrosine Is UAC)(c) What does the actual structure of t-RNA look like?

Answer»

Solution :(a) Francis Crick
(b)
(C )In ACTUAL structure, the tRNA is a COMPACT MOLECULE which looks LIKE inverted L
Discussion
23288.

Question : (a) Name the phenomenon which contributes to keep the earth warmer than the moon. (b) How it does so? (c) What are its consequences?

Answer»

SOLUTION :(a) GREEN HOUSE EFFECT.
Discussion
23289.

Question : (a) Name the osurce plant of heroinc drug .ow is it obtained form the plant? (b) Write the effect of heroinon the human body.

Answer»

Solution :(a) Poppy PLANT (papaver somniferum) is the osurces of heroin DRUG .This is extracted form the latex of he poppy plant
(b) EFFECT of heroin drug are : (i) It depresses brthing (II) It slows down body functions
Discussion
23290.

Question : a. Name the Indian scientist who participated in the group which established genetic code.b. Mention the other scientists and their contribution to genetic code

Answer»

Solution :a. Hargobind Khorana
b. Marshall Nirenberg and ROBERT Holley are the other scientists. Theirteam established that the mother of all codes, the BIOLOGICAL language common to all living organisms is spelled out in three letter WORDS, each set of three nucleotides codes for a specific AMINOACID. They gotthe NOBEL Prize for this work in medicine and physiology
Discussion
23291.

Question :(a) Name the group of viruses responsible for causing AIDS in humans. Why are these viruses so named? (b) List any two ways of transmission of HIV infection in humgns, other than sexual contact.

Answer»

Solution :(a) Retrovirus : These are named so because they have RNA genome. They have reverse transcriptase enzyme which carries on the processes `RNto DNAto RNA`.
(b) (i) Through INFECTED blood transfusion.
(ii) Sharing SYRINGES, needles.
(III) In children born to HIV MOTHERS.
Discussion
23292.

Question : (a) Name the category ofprotectedareasrecentlyevolvedby UNESCO's Man and BiosphereProgramme (MABP). Define it.(b) Give its zones. Also explainits role.

Answer»

SOLUTION :(a) Biospherereserves. (a) and(B) .
Discussion
23293.

Question : (a) Name the causative agent of typhoid in humans. (b) Name the test administered to confirm the disease. (c) How does the pathogen gain entry into the human body ? Write the diagnostic symptoms and mention the body organ that gets affected in severe cases.

Answer»

Solution :SALMONELLA typhi is a pathogenic bacterium which causes typhoid fever in human beings. (b) Typhoid fever can be confirmed by widel test. (c) These Pathogens generally enter the small intestine through food and water contaminated with them and migrate to other organs through blood. Symptoms : Sustained high fever (`39 ^@ a 40^@`C) weakness, stomach pain, constipation headache and loss of appetite are some of the common symptoms of this DISEASE. Intestinal perforation and DEATH may occur in SEVERE cases. In severe cases the disease affects the Alimentary CANAL and brain.
Discussion
23294.

Question : (A)Nameany two places where it isessential to intall electrostatic precipitators . Why is it reuired to do so ? (b) Mention one limitationof the electtostatic precipitor.

Answer»

Solution :The two places where it is essential to install ELECTROSTATICPRECIPITATORS are thefollowing:
1. thermalpower PLANTS
2.Smelters
itis required sotoseparateparticulate and gaseousair pollutants fromharmless gases such as nitrogen , oxygenetc.
( B)An electrostatic precipitor cannot remove particulate matter ofsize 2.5micrometers orlessin diameter(PM.2.5) these fineparticle can causerespiratory symptoms , inflammationnn and irrationof lungs and premature DEATH.
Discussion
23295.

Question : (A)Mutationsarebeneficialforplant breeding.Takingan exemple, justifythe statement. (b)Discuss briefly thetechnologhy thatmadeusself- sufficientin foodproducation .

Answer»

Solution : It ispossibletoinducemutationsartificiallyin plants throughuseofchemicalsorradiations(likegammaradiations ) ,andthenselectingandusingthoseplantsthathavethedesirablecharacter as a sourceasa sourcein breeding .
thisprocessis calledmutationbreeding , inmungbean, resistanceto yellow MOSAIC virusandpowdery mildew wasinducedwas induced by MUTATIONS .
(b) TRADITIONAL farmingcan onlyyielda limitedbiomass , asfoodforhumansandanimals .Better mangementpracticesand increase in agricuiturallandaera increase yield ,butonlyto alimited EXTENT, PLANT breedingas atechnologhhashelped increse producationtoavery largeextent,
plantbreedingis thepurposefulmanipulationof plantspeciesin order andarediseaseresistant .
THis techologhhasgivensupportto greenrevolution, whichresponsiblefor notmerelymeetingthenational requirments in foodprouction, butalsohelpedustoexport it .
Discussion
23296.

Question : A mutually beneficial association necessary for survival of both the partners

Answer»

Symbiosis
Commensalism 
AMENSALISM 
Both (A) and (B) 

ANSWER :A
Discussion
23297.

Question : A mutational event, which changes the condo UGG to UAG is known as

Answer»

Non-sense MUTATION
POINT mutation
mis-sense mutation
Frameshift mutation

ANSWER :A
Discussion
23298.

Question : A mutational event which changes the codon UGG to UAG is known as

Answer»

GROSS mutation
mis-sense mutation
nonsense mutation
frame SHIFT utation

Answer :C
Discussion
23299.

Question : A mutation which reduces normal function is called ____ mutation

Answer»

NULL
ECTOPIC
Hypermorphic
Hypomorphic

ANSWER :D
Discussion
23300.

Question : A mutation that changesa codon specifying one amino acid to a termination codon is called a

Answer»

Mis-sense MUTATION
TRANSITION mutation
Non-sense mutation
Frameshift mutation

ANSWER :C
Discussion