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This section includes InterviewSolutions, each offering curated multiple-choice questions to sharpen your knowledge and support exam preparation. Choose a topic below to get started.

2251.

Question : Outline a project which aims to find the dominant coat colour in dogs.

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SOLUTION :
Discussion
2252.

Question : Outermost covering of brain is called as

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DURA MATER
pia mater
pericardium
gray matter

Answer :A
Discussion
2253.

Question : Out of two elements A and B with mass number 2 and 235 respectively. Which one is suitable for making. a) A nuclear reactor b) A hydrogen bomb Name the nuclear reaction involved in each case, write one difference between the two types of nuclear reactions.

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Solution : a) For a nuclear reactor - element .B. with MASS NUMBER 235 is suitable as a fuel in nuclear reactor. b) For a hydrogen bomb - element .A. with mass number 2 is suitable for making the hydrogen bomb.
The nuclear reaction involved in
a) Nuclear reactor is nuclear fission reaction. b) Nuclear bomb is nuclear fusion reaction.
Difference between fission and fusion.
Fusion reaction RELEASES such GREATER energy with non- RADIOACTIVE products than the energy released in fission reaction with radioactive products.
Discussion
2254.

Question : Our body contains a large number of cells 'L' which are the longest cells in the body. L has long and short branch called as 'M' and 'N' respectively. There is a gap 'O' between two 'L' cells, through which nerve impulse transfer by release of chemical substance 'P'. (i) Name the cells L (ii) What are M and N? (iii) What is the gap O? (iv) Name the chemical substance P

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Solution :Neuron
Axon and Dendrites
SYNAPTIC Junction (KNOB)
NEUROTRANSMITTER (AcetylCholine)
Discussion
2255.

Question : Osteoblasts are found in

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BLOOD
muscle
bone
cartilage

Answer :C
Discussion
2256.

Question : Osmosis is the movement of

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solute PARTICLES from lower to higher CON centration
solute particles from higher to lower con centration
solvent particles from lower to higher CONCENTRATION
solvent particles from higher to lower concentration 

ANSWER :B
Discussion
2257.

Question : Osmoregulation is control over the

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removal of nitrogen from the BODY
concentrations of salt and WATER in the body
osmotic PROPERTIES of cell membrances
pH of the blood

Answer :B
Discussion
2258.

Question : Ornithophillous flowers are pollinated by:

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Wind
Bats
Birds
Snail

Answer :C
Discussion
2259.

Question : Organisms with modified endogenous gene of a foreign gene are also known as_____.

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TRANSGENIC ORGANISMS
genetically modified
mutated
both (a) and (B)

SOLUTION : transgenic organisms
Discussion
2260.

Question : Organisms which synthesise carbohydrates from inorganic compounds using radiant energy are called

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decomposers
PRODUCERS
herbivores
carnivores

Solution : Producers (plants) SYNTHESISE carbohydrates from inorganic compounds USING radiant ENERGY are called producers.
Discussion
2261.

Question : Organisms which depend on the producers directly or indirectly for food are called ________

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SOLUTION : consumers/heterotrophs
Discussion
2262.

Question : Organisms of the same trophic level are

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deer and honey BEE
cheetah and wild BEAR
snake and EARTHWORM
CROW and cow

ANSWER :A
Discussion
2263.

Question : Organisms of a higher trophic level which feed on several types of organisms belonging to a lower trophic level constitute the

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Food web
ecological PYRAMID
Ecosystem
food chain.

Solution : Organisms of a HIGHER trophic LEVEL which feed on SEVERAL types of organisms belonging to a LOWER trophic level constitute the food web.
Discussion
2264.

Question : Organisms depend on the producers either directly or indirectly for their sustenance ? These organisms which consume the food produced, either directly from producers or indirectly by feeding on other consumers are the consumers. Consumers can be classed variously as herbivores, carnivores, omnivores and parasites. The microorganisms, comprising bacteria and fungi, break-down the dead remains and waste products of organisms. These microorganisms are the decomposers as they break-down the complex organic substances into simple inorganic substances that go into the soil and are used up once more by the plants. Give one example each of a herbivore, carnivore, omnivore and a parasite.

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SOLUTION :Example of -
Herbivore - Deer, Grasshopper, Cow
Carnivore - WOLF, Tiger
OMNIVORE - Crow, DOG
Parasite - FUNGI, Cuscuta, Leech.
Discussion
2265.

Question : Organisms depend on the producers either directly or indirectly for their sustenance ? These organisms which consume the food produced, either directly from producers or indirectly by feeding on other consumers are the consumers. Consumers can be classed variously as herbivores, carnivores, omnivores and parasites. The microorganisms, comprising bacteria and fungi, break-down the dead remains and waste products of organisms. These microorganisms are the decomposers as they break-down the complex organic substances into simple inorganic substances that go into the soil and are used up once more by the plants. Why do all organisms depend on producers for their substances ?

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Solution :All organisms depend on PRODUCERS for their substances because only producers are CAPABLE of TRAPPING solar energy and CONVERTING it into chemical energy.
Discussion
2266.

Question : Organisms depend on the producers either directly or indirectly for their sustenance ? These organisms which consume the food produced, either directly from producers or indirectly by feeding on other consumers are the consumers. Consumers can be classed variously as herbivores, carnivores, omnivores and parasites. The microorganisms, comprising bacteria and fungi, break-down the dead remains and waste products of organisms. These microorganisms are the decomposers as they break-down the complex organic substances into simple inorganic substances that go into the soil and are used up once more by the plants. What do you infer about ecosystem from this information from the passage ?

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SOLUTION :An ecosystem is a self-sustaining system where all the LIFE forms derive their ENERGY in a FIXED manner and depend upon and influence their environment.
Discussion
2267.

Question : Organisms depend on the producers either directly or indirectly for their sustenance ? These organisms which consume the food produced, either directly from producers or indirectly by feeding on other consumers are the consumers. Consumers can be classed variously as herbivores, carnivores, omnivores and parasites. The microorganisms, comprising bacteria and fungi, break-down the dead remains and waste products of organisms. These microorganisms are the decomposers as they break-down the complex organic substances into simple inorganic substances that go into the soil and are used up once more by the plants. What happens to the body/or a body part on death of the organism ?

Answer»

Solution :The SAPROPHYTES like fungi and BACTERIA derive NUTRITION from dead-decaying organic MATTER by releasing their enzymes and degrading it to absordable from. This is how these saprophytes are nourished and the decomposing PARTS are used up.
Discussion
2268.

Question : Organic farming is better than green Revolution.Give reasons

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Solution :• Dwarfness is desired in cereals, so less nutrients are consumed by the crops •
Fertilizer responsive.
• Disease resistant varieties
• Insect and pest resistant crop varieties.
• HIGH levels of DESIRABLE nutrients LIKE vitamins, proteins and MINERALS.
Discussion
2269.

Question : Ophisaurus is a

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BLIND SNAKE
glass snake 
SEA snake
tree snake 

ANSWER :B
Discussion
2270.

Question : Only variations that confer an advantage to individual organism will survive in a population. Do you agree with this statement ? Why or why not ?

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Solution :YES, because of useful inherited /GENETIC variations of an individual ORGANISM can adapt and survive. MOREOVER they leave behind more offsprings and populations with such genetic variations will survive.
Discussion
2271.

Question : Only variations that confer an advantage to an individual organism will survive in a population. Do you agree with this statement ? Why or why not ?

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SOLUTION :Out of SYLLABUS.
Discussion
2272.

Question : Only variations that confer an advantage to an individual organism will survive in a population. Do you agree with this statement? Why or why not?

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Solution :In species variations that offer survival ADVANTAGE are naturally selected INDIVIDUALS adjust to their ENVIRONMENT with the help of those selected are passed on their PROGENCY. Evolution oforganism occurs as a result ofthis natural selection.However, there can be some other variations, which do not offer any survival advant​ag​e of some genes even if they are not important for survival.This accidental change in the frequency of gene in SMALL population is referred to as genetic drift, Thus, genetic drift provides diversity without any survival advantage
Discussion
2273.

Question : "Only father is responsible for the sex of a new born child." Explain with the help of a neat illustration.

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SOLUTION :
Discussion
2274.

Question : One tall pea plant and one dwarf pea plant on crossing resulted in 50% tall and 50% dwarf pea plant. The plants which were crossed were

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`TT xx Tt`
`TT xx tt`
`Tt xx tt`
NONE of the above.

Solution :
50% Tt Tall and 50% tt dwarf
Discussion
2275.

Question : One part of loop of Hanle is impermeable to water. Name it.

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SOLUTION :ASCENDING LIMB.
Discussion
2276.

Question : One of these is not a part of stamen

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Pollen
Anther
Ovule
Filament

Answer :C
Discussion
2277.

Question : One of these is not a life processA) RespirationB) SensationC) ReproductionD) Excretion

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Respiration
Sensation
Reproduction
Excretion

Answer :C
Discussion
2278.

Question : One of these does not belong to the group with respect to reproduction

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Cockroach
Human
Starfish
Fish

Answer :C
Discussion
2279.

Question : One of these does not belong to the group

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Petals
Sepals
Pollens
Roots

Answer :D
Discussion
2280.

Question :One of the most resistant biological materials known is

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SPOROPOLLENIN
HEMICELLULOSE
LIGNOCELLULOSE
lignin

Answer :A
Discussion
2281.

Question : One of the following occurs in the reproductive system of flowering plants as well as that of humans. This is :

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VAS deferens
anther
ovary
style

Solution :N//A
Discussion
2282.

Question : One of the following process does not lead to the formation of clones. Thus is :

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fission
fertilisation
fragmentation
tissue culture

Solution :N//A
Discussion
2283.

Question : One of the following is transgenic of organisms

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HOLLY SHEEP and Flavr SAVR TOMATO
Holly sheep and COTTON Bt
Dolly sheep and Cotton Ct
Flavr savr tomato and Cotton Bt

Answer :D
Discussion
2284.

Question : One of the examples of two analogous organs can be the wing of parrot and (i) flipper of whale (ii) foreleg of horse (iii) front leg of frog (iv) wings of housefly.

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Solution :(iv) WINGS of PARROT and wings of housefly have SIMILAR APPEARANCE and perform similar FUNCTIONS.
Discussion
2285.

Question : One of the factors required for the maturation of erythrocytes is

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VITAMIN D
vitamin A
vitamin B12
vitamin C 

ANSWER :C
Discussion
2286.

Question : One of the essential organs for fertilisation is

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MATURE OVULE
GREEN sepals
coloured PETALS
JUICY fruit

Answer :A
Discussion
2287.

Question : One heartbeat in an average man lasts

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0.8 second
0.2 second
0.5 second
1 MINUTE 

ANSWER :A
Discussion
2288.

Question : One day Suresh connected many house hold high power appliances having a current rating more than 6A to a multiplug of 6A rating when he was about to switch them on his elder sister shouted and asked him to remove the appliances from a single socket. a) According to you, why she would not advice to connect multi high power, appliances on a single socket? b) What would have happened if he switched them on. c) What was the value shown by his sister.

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Solution : a) Connecting too many appliances to a single socket can cause overloading. b) A large amount of current would have flowed through the circuit beyond PERMISSIBLE VALUE i.e, 6A. Due to overloading the wires of the circuit get heated which may also cause fire.c) Knowledge application, concern for her BROTHER, presence of MIND.
Discussion
2289.

Question : One day Mohan had a severe toothache. His father took Mohan to a dentist. The dentist examined all the teeth of Mohan very carefully and said that he had tiny holes in his two teeth. He also told Mohan that all his teeth were covered with a sticky, yellowish layer. The dentist performed a certain procedure on his two teeth having tiny holes and also gave him some medicines. Mohan's toothache disappeared gradually. (a) What are the tiny holes in the teeth known as ?(b)How are the tiny holes formed in the teeth ? (c) What kind of procedure was performed by dentist on Mohan's two teeth ? (d) What is the sticky, yellowish layer on Mohan's teeth known as ? (e) How is the sticky, yellowish layer formed on the teeth ? (f) What advice will you give to Mohan to avoid such dental problems in future ?

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Solution :(a) The tiny holes formed in the teeth are known as 'cavities' or 'dental caries'.
(b) When a person eats SUGARY food (sugar-containing food), then the bacteria present in mouth act on sugar present in food to produce acids. These acids first dissolve the calcium salts from tooth enamel and then from dentine forming tiny holes (or cavities) in the tooth over a period of time.
(c ) Mohan's dental cavities (or holes) were first cleaned by the dentist and then 'filled' with appropriate filling material.
(d) The sticky, yellowish layer on the teeth is known as 'dental plaque'.
(E) If the teeth are not cleaned regularly, they become covered with a stickly, yellowish layer of food particles and bacteria cells called 'dental plaque'.
(f) (i) Mohan should eat less of sugary food such as toffees, chocolates and sweets, etc. Heshould also avoid drinking too much of sweetened drinks such as Coca-Cola, PEPSI, etc.
(II) Mohan should brush his teeth regularly with a toothpaste (after eating food). This will remove the dental plaque before bacteria produce acids.
(III) Mohan should get his teeth examined by a dentist at least once in three months.
Discussion
2290.

Question : One boy goes to a school by his vehicle. On the way he reaches to a cross-road where red signal is shown. He turns off his vehicle till green signal appears. From this, he has used which R to save the environment ?

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REDUCE
RECYCLE
Reuse
None of the given

Solution :Reduce
Discussion
2291.

Question : Once a person starts taking drugs or alcohol it is difficult to get rid of the habit. Why ?

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SOLUTION :It is difficult to get RID of the habit because, they feel a STRONG urge to keep taking a drug or alcohol are dependent. It reaches the BRAIN through blood stream. The persons fully dependent on drug or alcohol and they cannot LIVE without drugs, which we call drug dependance.
Discussion
2292.

Question : On which basis are the factors /points, chosen for the energy source ?

Answer»

SOLUTION :We would choose the energy SOURCE on the basis of following factors :
`rarr` the EASE of EXTRACTING energy from that source,
`rarr` the economics of extracting energy from the source,
`rarr` the efficiency of the technology avalable
`rarr` the environmental damage that will be CAUSED by using that source.
Discussion
2293.

Question : On what principle an electric motor works? Define the rule used to identify the direction of force on the conductor in an electric motor.

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Solution :The principle of an electric motor is used on the FACT that current carrying conductor produces a magnetic field around is current carrying conductor PLACED perpendicular lo magnetic field experiences a force.
FLEMINGS left hand rule used is to DETERMINE direction.
The commercial motors use
i) An electromagnet in place of permanent MAGNET.
ii) Large number of turns of the conducting wire in the current carrying coil.
iii) The soft iron core, on which the coil is wound plus the coils is called armature
Discussion
2294.

Question : On what basis would you classify energy sources as …………. (a) renewable and non-renewable ? (b) exhaustible and inexhaustible ? Are the options given in (a) and (b) the same ?

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SOLUTION :YES, OPTIONS GIVEN in (a) and (B) are same.
Discussion
2295.

Question : On touching a hot plate, you suddenly withdraw your hand. Which category of neurons became active first and which one next ?

Answer»

Solution :On touching a hot plate, first the sensory NEURONS are ACTIVATED, which take the information to the brain or the spinal cord. Next, the motor neurons become ACTIVE and bring the impulses form the brain to the muscles. In receiving these impulses, the muscles CONTRACT, and the hand is IMMEDIATELY removed from the hot plate.
Discussion
2296.

Question : On the surface of potato tuber, there are many …………………. present for the asexual reproduction.

Answer»


ANSWER :BUDS
Discussion
2297.

Question : On the basis of the debate, decide which energy sources can be considered (i) Exhaustible, (ii) Inexhaustible, (ii) Renewable and (iv) Non-renewable. Give your reasons for each choice.

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Solution :(i) Exhaustible : Fossil fuel, coal will get depleted some DAY.
( ii) Inexhaustuble : WIND, tidal, solar energy. etc. are in the form continuing or repetitive currents of energy.
(iii) Renewable : Biomass, if we manage PROPERLY. it can GIVE a constant supply of energy at a particular rate.
(iv) Non-renewable : Fossl fuels as once USED up, they are lost forever and cannot be renewed.
Discussion
2298.

Question : On chromosomes certain bead like structure are arranged in a linear order these are

Answer»

Ribosomes
Centromeres
Centrioles
Genes

Solution :This is the CORRECT ANSWER.
Discussion
2299.

Question : Omnivores

Answer»

SOLUTION :MAN, BEAR
Discussion
2300.

Question : Okazaki fragements are joined together by ______.

Answer»

Helicase
DNA polymerase
RNA primer
DNA ligase

Answer :D
Discussion