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4651.

Question : A solar water heater cannot be used to get hot water on ……………..

Answer»


a CLOUDY DAY
a HOT day
a WINDY day

Solution :a sunny day
Discussion
4652.

Question : A snail can change its sex. What does it indicate?

Answer»

The sex determination therein is not a GENETIC PHENOMENON.
It is BISEXUAL.
It is sterile.
Some of the chromosomes in its ZYGOTE differentiate into Y-chromosomes.

Answer :A::C::D
Discussion
4653.

Question : A small part of the shoot of a plant is removed with a sharp knife. When the lower end of this small part of the soot is buried in moist soil, it gradually develops roots and shoots and grows to become a new plant. (a) What is the name of this method of propagating plants ? (b) What care should be taken while removing a small part of the shoot from the parent plant with a knife? (c) Name any two plants which provide us which food directly or indirectly and are grown by this method. (d) Give one adavantage of this of this method of producing new plants. (e) State whether it is a sexual method of reproduction or an asexual method. why ? (f) What special name can be given to the genetically or an asexual method. Why ?

Answer»


SOLUTION :N//A
Discussion
4654.

Question : A small cut part of organism's body can form complete new organism. This process is known as ………………….

Answer»


ANSWER :REGENERATION
Discussion
4655.

Question : A skeleton like function during locomotion of Pheretima posthuma is performed by

Answer»

blood
alimentary canal laden with mud
coelomic fluid
ventral nerve CORD 

ANSWER :B
Discussion
4656.

Question : A singlehighlycoiled tubewherespermsare stored, getconcentratedand matureisknown as ________.

Answer»

Epididymis
Vasa efferentia
Vas deferens
SEMINIFEROUS TUBULES

SOLUTION :Seminiferous tubules
Discussion
4657.

Question : A simple multicellular animal having tentacles and lives in fresh water reproduces by the asexual method of ……………....a.binary fissionb.spore formationc.buddingd.fragmentation

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BINARY FISSION
SPORE formation
budding
fragmentation

Answer :B::D
Discussion
4658.

Question : A short length of a DNA molecule contains 120 adenine and 120 cytosine bases. The total number of nucleotides in this DNA fragment is

Answer»

480
120
60
240

Answer :A
Discussion
4659.

Question : A sewage treatment process in which a portion of the decomposer bacteria present in the waste recycled into the beginning of the process is called

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activated SLUDGE TREATMENT
PRIMARY treatment
TERTIARY treatment
cyclic treatment

Answer :A
Discussion
4660.

Question : A segment of DNA which determines the syn- thesis of complete polypeptide is called,

Answer»

Intron
Exon
Cistron
Codon

Answer :C
Discussion
4661.

Question : A scout bee, finding a new food source, commu nicates its location to other bees and

Answer»

cannot COMMUNICATE the DIRECTION of the food source
can communicate direction of food source by round dance
can communicate direction of the food source by tail-wagging dance
can communicate direction of food source by rapid DANCES 

Answer :C
Discussion
4662.

Question : A scientist kept 80 generations of Drosophila in darkness, even after that the flies had normal eyes. This disapproves law of

Answer»

NATURAL selection
acquired characters
use and DISUSE
SYNTHETIC theory

Answer :B
Discussion
4663.

Question : A scientist removed some cells from the growing point of a plant and placed it in a suitable medium leading to the formation of a shapeless lump of mass X,Y is then transferred to another medium which stimulates itto develop roots. Whem X which developed roots is placed in a yet aniother medium, then it develops shoots to from tiny plantlets. These plantlets can then be transplanted in pots or soil where they can grow to form matureplants. (a) What is the shapeless lump of mass X known as ? (b) What name is given to this method of producing new plants ? (c) The growth medium used in this method contains palnt nutrients in the form of jelly . Name this jelly. (d) What is the general name of chemicals used to stimulate the growth of palnt cells and development of roots and shoots? (e) Name any two plants which are produced by this method. (f) State any two advantage of this method of producing plants (g)What is the other name of thsi method [other than that given in (b) above ?

Answer»


SOLUTION :N//A
Discussion
4664.

Question : A role of accessory structures, such as the bones of the middle ear, in a sense organ is to

Answer»

transduce the stimulus
INTEGRATE the RESPONSE
AMPLIFY the stimulus
amplify the response

Answer :C
Discussion
4665.

Question : A renewable source of energy is

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petroleum
coal
nuclear FUEL
TREES

Solution : trees
Discussion
4666.

Question : A reflex arc does not involve

Answer»

a RECEPTOR
a SENSORY PATHWAY
a MOTOR pathway
the brain

Answer :D
Discussion
4667.

Question : A recessive factor is altered by the presence of a dominant factor.

Answer»


ANSWER :1
Discussion
4668.

Question : A receptor is a cell or group of cells that receives the stimuli.

Answer»


ANSWER :CORRECT
Discussion
4669.

Question : A rat is in which category of consumer animals ?

Answer»

HERBIVORES
CARNIVORES
OMNIVORES
Decomposer

Solution :Omnivores
Discussion
4670.

Question : A pure tall plant (TT)is crossed with pure dwarf plant (tt),What would be the F_(1) and F_(2) generations?Explain.

Answer»

SOLUTION :In `F_(1)` generation, all are tall plants. (Genotype all are TT and phenotype all are tall).
In `F_(2)` generation, genotype three tall and ONE dwarf. [TT: Tt: tt = 1:2:1] phenotype.
Tall : dwarf 3:1 [TT: Tt: Tt: tt]
Discussion
4671.

Question : A pure dominant pea plant producing round - yellow seeds is crossed with pure recessive pea plant producing wrinkled - green seeds, The numbers of plants bearing round - green seeds in the F_(1) generation of Mendel's experiment is

Answer»

0
1
3
9

Answer :A
Discussion
4672.

Question : A protein rich wheat variety is ________

Answer»

SOLUTION :ATLAS 66
Discussion
4673.

Question : A primary root grows from 5 cm to 19 cm in a week. Calculate the growth rate and relative growth over the period.

Answer»

Solution :(a) Growth = 19 – 5 = 14 CM, Period = 7 days
Growth rate ` = 14/7` = 2cm/day
(b) INITIAL growth ` = 7/5` cm
Growth rate day `(19 - 5)/(7) = 2cm `
Relative growth rate ` = 2/5 XX 100= 40%`
Discussion
4674.

Question : A portal system is that in which

Answer»

a vein begins from an ORGAN and ends in heart
an ARTERY BREAKS up in an organ and RESTARTS by the union of its capillaries
the blood from gut is brought into kidneys before it is poured into heart
a vein breaks up in an organ into capillaries and restart by their union as a new vein in the same organ 

Answer :D
Discussion
4675.

Question : A population of red beetles lives in green bushesin a garden. Once during the process of breeding, a green beetle is produced. (a) State whether the change in colour of beetle is a process of evolution or not. (b) Can the new colour of green beetle be passed on to its next generations ? (c) What will be the advantage (if any ) of the green colour to the beetle ? (d) State whether the production of green colour involved a change in genetic material or not.

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Answer :(a) Yes(b) Yes(c) The GREEN COLOUR of beetle ALLOWS it to MIX up with green bushes and helps in its survival (because then it cannot be SEEN easily by the predalors)(d) Yes
Discussion
4676.

Question : A poorva is a student of tenth class. She has asked her father to replace all the old filament-type bulbs in her house by CFLs. She herself uses a bicyclefor going to her school. Apoorva has a habit of writing on both the sides of her notebook pages and never tears away pages from notebooks. One day when Apoorva went to the village fields alongwith her father, she saw two snakes in the standing crops. The farmers wanted to kill these snakes but Apoorva requested them not to do so. While at home or school, Apoorva is very particular to get the leaking taps repaired by the plumber immediately. (a) What really is conserved when Apoorva uses CFLs in her house instead of filament-type bulbs ?(b) What really is conserved when Apoorva goes to her school on bicycle ? (c ) What really is conserved when Apoorva writes on both sides of the pages in her notebook ? (d) What really is conserved when Apoorva does not allow the snakes in standing crop fields to be killed ? (e) What is conserved when Apoorva gets the leaking taps repaired immediately ? (f) What are the things conserved by Apoorva commonly known as ?(g) What values are displayed by Apoorva by her actions ?

Answer»

SOLUTION :(a) Coal (because coal is used to produce electricity).
(b) PETROLEUM (because a petroleum PRODUCT 'petrol' is used in GOING to school by car or scooter).
(c ) Forests (because paper used in making notebook is obtained from wood of forest trees).
(d) Wildlife (because snake is a part of wildlife which is a friend of the farmer).
(e) Water (because leaking taps waste water).
(f) Natural resources.
(g) The values displayed by Apoorva are (i) Management of natural resources (or conservation of natural resources) because coal, petroleum, forests and wildlife, and water are all natural resources, and (ii) Concern for a healthy ENVIRONMENT.
Discussion
4677.

Question : A plant placed near a window bends outward because

Answer»

its tip is able to OBTAIN more LIGHT
its tip is able to receive necessary warmth
the AUXIN content on the shaded SIDE is higher than that on the lighter side and as a result the shaded side elongate more than the cells on the illuminated side and the tip bends outward
its tip is able to GET more oxygen

Answer :C
Discussion
4678.

Question : A plant hormone was first discovered in Japan when rice plant were sufferring from Bakanae disease caused by Gibberella fujikoroi. Based on this information answer the following questions. (i) Identify the hormone involved in this process. (ii) Which property of this hormone causes the disease? (iii) Give two functions of this hormone.

Answer»

Solution :(a) Gibberellins(b) Internodal elongation ( c) FUNCTIONS: (i) PROMOTES the production of MALE flowers in monoecious plants. (II) Gibberellins break dormancy of potato tubers.
Discussion
4679.

Question : A plant disease called witches broom occurring in legumes is caused by

Answer»

bacterium
algae
mycoplasma
virus

Answer :C
Discussion
4680.

Question : A Planaria worm is cut horizontally in he middle into two halves P and Q such that the part P contains the whole head of the worm. Another Planria worm is cut vertically into two halves R and S in such a way that both th cut pieces R and S contain half hed each. Which of the cut pieces of the two Planaria worms couldregenerate to from the complete respective worms ?

Answer»

<P> only
only R and S
P,R and S
P,Q,R and S

SOLUTION :N//A
Discussion
4681.

Question : A pine tree is an example of a

Answer»

angiosperm
bryophyte
gametophyte
sporophyte 

ANSWER :D
Discussion
4682.

Question : A pigeon in the absence of down feathers will NOT be able to

Answer»

FLY for LONG distance
protect against ectoparasites
exhibit SECONDARY SEXUAL dimorphism
keep the BODY warm

Answer :D
Discussion
4683.

Question : A picture to demonstrate windmill and its function. Which is the structure similar to windmill ?

Answer»

SOLUTION :The STRUCTURE of WINDMILL is simillar to ELECTRIC FAN.
Discussion
4684.

Question : A picture to demonstrate windmill and its function. Which energy conversion is shown in the picture ?

Answer»

SOLUTION :KINETIC ENERGY into MECHANICAL energy.
Discussion
4685.

Question : A picture to demonstrate windmill and its function. What function does windmill show in the picture ?

Answer»

SOLUTION :To LIFT WATER from a WELL.
Discussion
4686.

Question : A person's two kidneys are spoiled. There is no donor for him to transplant kidney. What method will the doctors follow to save his life ? Write detail procedure.

Answer»

Solution :Dialysis machine is used to filter the blood of a person when two kidneys are damaged. The process is called 'haemodialysis'.
Principles involved in the process :

1) In this process blood is taken out from the main artery, mixed with an anticoagulant such as heparin and then pumped into the APPARATUS called dialyzer.
2) In this apparatus blood flows through channels or tubes. These tubes are embedded in the dialyzing fluid.
3) The membrane separates the blood flowing INSIDE the TUBE and dialyzing fluid, whichhas the same composition as that of plasma, except the NITROGENOUS wastes.
4) The patients blood is passed through the tubes, during this passage the waste products from the blood pass into dialysingfluid by diffusion.
5) This process is called dialysis.
6) The purified blood is pumped back into the patient through a vein. This is similar to the function of kidney but it is different since there is no reabsoprtion involved.
7) Each dialysis session lasts for 3 to 6 hours. This method has been using for thousands of uremic/kidney failure patients all over the world.
Principle : Dialysis machine works on the principles of the diffusion of solutes and ultrafiltration of fluid across a semipermeable membrane.
Discussion
4687.

Question : A person will suffer from beriberi, rickets and scurvy if he is not consuming adequate amounts of

Answer»

VITAMIN `B_(6)`, A and C
vitamin `B_(1)`, D and C
vitamin A, `B_(1)` and E
vitamin `B_(6)`, A and K

Answer :B
Discussion
4688.

Question : A person who met with an accident lost control of body temprature ,water balance and hunger.Which of the following part of brain is supposed to be damaged?

Answer»

MEDULLA OBLONGATA
CEREBRUM
pons
hypothalamus

ANSWER :D
Discussion
4689.

Question : A person uses concave lenses, if he sees after removing its spectacles, then in his eyes image of the object will be formed

Answer»

BEHIND RETINA
on fovea centralis
in FRONT of retina
FAR from retina

Answer :C
Discussion
4690.

Question : A person uses concave lenses, if he sees after removing his spectacles, then in his eyes image of the object will be formed

Answer»

BEHIND retina
on fovea centralis
in FRONT of retina
FAR from retina

Answer :C
Discussion
4691.

Question : A person suffering from bleeding gums needs in his food

Answer»

citrus
carotene
cod LIVER oil
vitamin K

Answer :A
Discussion
4692.

Question : A person suffering from fever is advised to take blood test. What may happen to his WBC count and why ?

Answer»

Solution :The WBC COUNT of this person may show an increase from the normal range. As pathogens may be PRESENT in his body, so the body is PRODUCING more WBCs to FIGHT against those pathogens. WBC count is a good tool to ASSES the presence of infection in a sick person.
Discussion
4693.

Question : A person severely injured in an accident needs blood. Antigen A Is detected in his blood on blood text. From the following persons whose blood can be received by him

Answer»

X - A group
Y - B group
Z-AB group

Answer :A
Discussion
4694.

Question : A person injured, after several days his wound completely healed. What type of process took place at the injured part ? Represent these atages with diagram.

Answer»

Solution :At INJURED PLACE wound was healed through mitosis. The stages of mitosis are as FOLLOWS.
Discussion
4695.

Question : A person having fever may be breathing faster than normal. The reason for this faster breathing is due to

Answer»

ADDITIONAL NEED of `O_(2)` for germs
mental worry of the patient
high temperature of body
loss of appetite 

ANSWER :C
Discussion
4696.

Question : A person going up to 10,000 feet high in a hot balloon may develop severe pain in the ear due

Answer»

BLOCKED eustachian tube
RUPTURE of fenestra ROTUNDA
ENDOLYMPH getting into semicircular CANALS
fear of great height

Answer :A
Discussion
4697.

Question : A pearl oyster belongs to class

Answer»

mollusca
bivalvia
scaphopoda
gastropoda 

ANSWER :B
Discussion
4698.

Question : A pea plant with blue colour flower denoted by BB is cross-bred with a pea plant with white flower denoted by WW. (i) What is the expected colour of the flowers in their F_(1) progeny? (ii) What will be the percentage of plants bearing white flower in F_(2) generation, when the flowers of F_(1) plants were selfed? (iii) State the expected ratio of the genotype BB and BW in the F_(2) progeny.

Answer»

SOLUTION :(i) All the flowers in `F_(1)` GENERATION will have dominant blue colour.
(II) When `F_(1)` plants were selfed, the percentage of white flower in `F_(2)` generation will be `25%`.
(iii) Genotype of BB and BW in the `F_(2)` progeny are 1:2.
Discussion
4699.

Question : A pea plant with blue colour flower denoted by BB is cross-bred with a pea plant with white flower denoted by ww. (a) What is the expected colour of the flowers in their F_1 progeny? (b) What will be the percentage of plants bearing white flower in F_2 generation, when the flowers F_1 plants were selfed? (c) State the expected ratio of the genotype BB and Bw in the F_2 progeny.

Answer»

SOLUTION :
(a) BLUE (b) 25% (c) BB: Bw=1:2
Discussion
4700.

Question : A patientwithblood groupO wasinjuredinan accident and haslost. Whichbloodgroupthedoctorshouldeffectivelyusefortransfusionin thiscondition?

Answer»

O GROUP
AB group
A or B group
all BLOOD group

Solution :all blood group
Discussion