24277 + Interview Questions in Biology in Class 12 Page 333 InterviewSolution

16601.	Question : Heat shock treatment in bacterial transformation is to facilitate
Answer» Uptake of DNA through membrane transport PROTEINS Uptake of DNA through TRANSIENT pores in BACTERIAL cell wall. EXPRESSION of antibiotic resistance gene Binding of DNA to the cell wall. Solution :Uptake of DNA through transient pores in bacterial cell wall.

Discussion

16602.	Question : Heartwood differs from sapwood as
Answer» It is peripheral It is LIGHTER in colour It helps in conduction of water and minerals It comprises of DEAD ELEMENTS with highly lignified walls Answer :D

Discussion

16603.	Question : heartwood is absent even in very old trunk of
Answer» QUERCUS and pinus salix and morus mangifera and DALBERGIA populus and salix. Answer :d

Discussion

16604.	Question : Heart valvular stenosis is caused by
Answer» RHEUMATIC fever Dengue fever Plague Rheumatoid arthritis Answer :A

Discussion

16605.	Question : Heart of heart is:
Answer» S.A.node A.V.node Bundle of his Purkinji fibres Answer :A

Discussion

16606.	Question : Heart muscle is sensitive to
Answer» ELECTRICAL stimuli Chemical stimuli Mechanical stimuli All of above Answer :D

Discussion

16607.	Question : Heartis the blood bank of the body.
Answer» True False Answer :SPLEEN

Discussion

16608.	Question : Heart is four chambered in crocodiles, birds and________.
Answer» ANSWER :MAMMALS,

Discussion

16609.	Question : Heart disorder in which cardiac muscles are suddenly damaged by inadequate supply of blood is
Answer» HEART failure Cardiac arrest Heart attack Atherosclerosis Answer :B

Discussion

16610.	Question : Heart beats are accelerated by :-
Answer» CRANIAL NERVES and acetylcholine Sympathetic nerves and acetylcholine Cranial nerves and adrenaline Sympathetic nerves and epinephrine Answer :D

Discussion

16611.	Question : Heart beat is regulated by the working of :
Answer» Midbrain Diencephalon Cerebrum MEDULLA oblongata ANSWER :D

Discussion

16612.	Question : Heaping of earth around base of stem in Potato is meant for
Answer» Preventing exposure of roots Providing extra support to DELICATE stem INDUCING DEVELOPMENT of more auxiliary shoots Making more WATER availabel. Answer :C

Discussion

16613.	Question :Healthy ecosystems are the base of wide range of (ecosystem) services. Justify. Explain the differences and the similarities between hydrarch and xerarch mccassions of plants.
Answer» SOLUTION :(a) Healthy ecosystems are the base for a wide range of economic, environmental and aesthetic goods and services. Some of these are as follows , (i) Purify air and water ' (ii) Mitigate droughts and floods (iii) Cycle nutrients ' (iv) Generate fertile SOILS (v) Provide wildlife habitat (vi) Maintain biodiversity (VII) Pollinate crops (viii) Provide storage site for carbon (ix) Provide aesthetic, cultural and spiritual values (b) Differences : Hydrarch succession takes place in wetter areas and the succession series progresses from hydric to the mesic conditions. Xerarch succession takes place in dry areas and the series progresses from xeric to mesic conditions. . SIMILARITY : Both successions lead to medium water conditions, neither too dry nor too WET.

Discussion

16614.	Question : Healthy ecosystems are the base for a wide range of goods and services. Find outany four ecosystem services provided by a healthy forest ecosystem.
Answer» Solution :Purify air and water Mitigate DROUGHT and floods CYCLING of NUTRIENTS Generate FERTILE soils.

Discussion

16615.	Question : Health problems caused due to heavy metal pollutants.
Answer» Solution :(1)Mercury causes ABDOMINAL PAIN,headache,diarrhoea,haemolysis and chest pain.(2)Lead causes anaemia,vomitting,loss of appetite,CONVULSIONS,damage to brain,liver and kidney,(3)Arsenic causes disturbed peripheral circulation,mental situbance,liver cirrhosis,hyperkeratosis,lung cancer,ulcers in gastrointestinal tract and kidney damage.(4)Cadmium causes diarrhoea,growth retardation,bone deformation,kidney damage,TESTICULAR atrophy,anaemia,hypertension, injury to central NERVOUS system and liver.(5)Slenium causes damage to liver,kidney and spleen,fevernervousness,vomiting,low blood pressure,blindness and even death.

Discussion

16616.	Question : Health complication caused by protein deficiency is
Answer» Marasmus , impaired mental problem , hair loss , abnormal blood coagulation , DEEP vein THROMBOSIS Goiter , KWASHIORKOR, dwarfism , hair loss, abnormalblood coagulation , deep vein thrombosis Myasthenia gravis , edema , wasting and shrinkage of muscle TISSUES , organ failure LYMPHOMA , weak immune system , Kwashiorkor , Marasmus , dwarfism , hair loss, abnormal blood coagulation , deep vein thrombosis Answer :A

Discussion

16617.	Question :Headof thespermcontainsthe ________.
Answer» SOLUTION :NUCLEUS

Discussion

16618.	Question : Head of sperm contains –
Answer» NUCLEUS and mitochondria Mitochondria and acrosome Acrosome and nucleus Nucleus, CENTRIOLE and mitochondria Answer :C

Discussion

16619.	Question : he lipid like steroidal hormones are synthesized in SER among :-
Answer» HOPANOID CONTAINING BACTERIAL cell Plant cell Animal cell More than one option is correct Answer :C

Discussion

16620.	Question : HCO_3^- ions formed inside RBCs diffuse out into the plasma an Cl^- ions enter intoRBCsat tissue level. The above mentioned statement is correct description of
Answer» HAMBURGER's phenomenon Haldane's effect Chloride Shift Both (1) &(3) ANSWER :D

Discussion

16621.	Question : HCG, HPL, Estrogen, Progestrone, Androgen, Relaxin, Thyroxin. How many of hormones are produced in women only during pregnancy ?
Answer» One Four Three Five Answer :C

Discussion

16622.	Question : HbA_2 is composed of :
Answer» `alpha_2 beta_2` `alpha_2 , gamma_2` `alpha_2 , delta_2` `alpha_2 , alpha_2` ANSWER :C

Discussion

16623.	Question : Having becomes an expert on gel electro-phoresis, you are asked to examine a gel for a colleague, Where would you find the smallest segment of DNA?
Answer» NEAR the POSITIVE electrode, farthest AWAY from the wells Near the negative electrode, close to the wells Near the top, near the negative pole Near the middle, they tend to slow down after the first few MINUTES Answer :A

Discussion

16624.	Question : Haversian systems are seen in spongy bones.
Answer» ANSWER :COMPACT BONES

Discussion

16625.	Question : Haversian system is a feature of
Answer» COMPACT bone Cancellous bone Both (i) & (II) SPONGY bone Answer :A

Discussion

16626.	Question : Haversian canal in the bone of mammals are connected by small blood vessel canal called
Answer» SCHLEMM 's cannal Volkmann 's canal Portal capillaries Sinuses Answer :B

Discussion

16627.	Question : …………have the ability to transform normal cells into cancerous cells.
Answer» Bacteriophage Retrovirus RHINOVIRUS T.M.V. Answer :B

Discussion

16628.	Question : Have a look on the diagram given below and answer the following : (a) Whatare induced pleuripotent stem cells (IPSCs)? (b) Mention any tow features ofIPSCs.
Answer» Solution : IPSCs are obtained from adult STEM cells. They can BECOME pleurototipotent and differentiateinto any TISSUE TYPE. The body does not reject IPSCs as they belongto patientand no drugs are NECESSARY to support the immune system

Discussion

16629.	Question : _________have dorso-ventrally flattened body.
Answer» ANSWER :PLATYHELMINTHES,

Discussion

16630.	Question : What is secondary productivity? Explain its types.
Answer» Solution :The amount of energy stored in the TISSUES of heterotrophs or consumers is called secondary productivity. a. Gross secondary productivity: It is equivalent to the total amount of plant material ingested by the herbivores MINUS the materials lost as faeces. b. NET secondary productivity: STORAGE of energy or biomass by consumers per unit area per unit time, after respiratory loss is called net secondary productivity

Discussion

16631.	Question : Haustorial root are foundin
Answer» CUSCUTA VANDA , heritiera dahlia MIRABILIS ANSWER :b

Discussion

16632.	Question : Harmful effects caused by drug abuse.
Answer» Solution :(1)Opiods binds to specific opioid receptors which are present in CENTRAL NERVOUS system and gastrointestinal tract.Some opioids e.g.heroine act like depressants and slow all the body functions(2)Cannabinoids have the capacity to intract with receptors present in the brain.Inhalation or ingestion of cannabinoids such as marijuana,hashish,charas and ganja have adverse effect on cardiovascular system.(3)CANNABINOID like LSD causes hallucinations.(4)All these substances are addictive and hence cause adverse EFFECTS on the body and health.

Discussion

16633.	Question : Harish observed two different types of papaya plants in his garden. One produced male flowers only and the other type produced female flowers as well as fruits. a. What are these type of plants called in which male and female flowers seen separately? b. Name another plant with the same feature. c. If both male and female flowers are seen separately in the same plant, what do you call them? Give examples.
Answer» Solution :a. DIOECIOUS B. Date PALM c. Monoecious. e.g. COCONUT, cucurbits

Discussion

16634.	Question : Hardy-Weinberg used the binomial expression p^2+2pq+q^2 to calculate the genotype and allele frequency of a populaiton. In this equation p is
Answer» HOMOZYGOUS DOMINANT indviduals homozygous RECESSIVE individuals Answer :B

Discussion

16635.	Question : Hardy - Weinberg equilibrium is known to be affected by gene flow, genetic drift, mutation,genetic recombination and
Answer» evolution limiting factors saltation natural selection Answer :D

Discussion

16636.	Question : Hardy-Weinberg equilibrium is known to be affected by gene flow, genetic drift, mutation, genetic recombination and
Answer» evolution limiting FACTORS saltation natural selection Answer :D

Discussion

16637.	Question : Hardy-weinberg equilibrium.
Answer» Solution :(1)Hardy and weinberg were TWO SCIENTIST who proposed a concept of genetic equilibrium popularly known as hardy-Weinberg PRINCIPLE or equilibrium.(2)this principle states that gene,allel,or genotype frequencies remain the same from GENERATION to generation unless disturbed by factors like mutation,nonrandom mating,genetic drift,etc.(3)For EXPLAINING the concept of equilibrium they assumed that there are two alleles located at a single locus (A and a).(5)The frequency of genotype AA is `P^(2)`,for 2Aa is 2pq for aa is `q^(2)`(6)The equilibrium equation is `p^(2)+2pq+q^(2)=1`.(7)It says that if sum total of gene frequenceies is 1 then sum total of genotype frequenceis is also equal to 1.When the equilibirium is disturbed then only evolution occurs.

Discussion

16638.	Question : Hardy Weinberg equilibrium is affected by
Answer» NATURAL selection New mutation Genetic drift All of the above Answer :D

Discussion

16639.	Question : Hardbast occurs in the stemk of Helianthus, Ricinus and few other plants. This structure represents
Answer» thin-walled patch of pericycle cells LYING above the PHLOEM thick-walled patch of pericycle cells lying above the phloem thick-walled patch of pericycle cells lying above the medullary RAYS UNUSUALLY thickened cells of phloem Answer :B

Discussion

16640.	Question : ____hardens the tooth enamel.
Answer» Calcium Fluorine Iodine Sodium Answer :A

Discussion

16641.	Question : Haploidy, diploidy and tripoloidy are the ploidy level of angiosperm plant parts from a seed is given below. How will you give explanation to reduction of chromosome number from diploid to haploid ? 1. Integuments - outer , inner Nucellus Secondary nucleus Zygote
Answer» Solution :CHROMOSOME NUMBER REDUCED DUE to reduction divison or meiosis.

Discussion

16642.	Question : Haploidy, diploidy and tripoloidy are the ploidy level of angiosperm plant parts from a seed is given below. Find out the chromosome status of each part.
Answer» SOLUTION :1) Integuments - OUTER - 2N(diploid) 2) Nucellus - 2n(diploid) 3) Seondary NUCLEUS - 3n(triploid) 4) Zygote - 2n(diploid)

Discussion

16643.	Question : Haploids produced from microspore or pollen
Answer» HETEROZYGOTES HOMOZYGOTES ANDROGENIC HAPLOIDS Myogenic haploids SOLUTION :Androgenic haploids

Discussion

16644.	Question :Haploids are more suitable for mutation studies then the diploids. This is because
Answer» HAPLOID are reproductively more suitable then DIPLOIDS mutagens penetrate in haploids more effectively than in diploid haploids are more abundant in NATURE than diploids. all mutations, weather dominanant or RECESSIVE are EXPRESSED in haploid. Solution :all mutations, weather dominanant or recessive are expressed in haploid.

Discussion

16645.	Question : Haploid plants can be obtained by culturing:
Answer» Pollen grain Endosperm Root apices NONE of these Solution :HAPLOID plants possess only one set of chromosomes. Haloid produced from microspores or pollen grains (anthers) are CALLED androgenic haploids. Maheswari and Ghua (1964,65) successfully REPORTED anther CULTURED plants from Datura innoxia.

Discussion

16646.	Question : Haploid number of chromosomes in your body cell are
Answer» 23 22 21 46 Answer :A

Discussion

16647.	Question : Hammerling's experiments on Acetabularia involved exchanging
Answer» CYTOPLASM Nucleus Rhizoid and stalk Gametes Answer :C

Discussion

16648.	Question : Haploid gametes are produced in bryophytes and angiosperms by two types of cell division. Name it.
Answer» SOLUTION :BRYOPHYTES- MITOSIS, angoisperms-meiosis

Discussion

16649.	Question : Hammerling experimented on:-
Answer» CHLORELLA Acetabularia Chara Ulva Answer :B

Discussion

16650.	Question : Halophytes occurs in
Answer» Salty SOIL Desert Near RIVER Rainy WATER ANSWER :A

Discussion

Explore topic-wise InterviewSolutions in .

Question : Heat shock treatment in bacterial transformation is to facilitate

Question : Heartwood differs from sapwood as

Question : heartwood is absent even in very old trunk of

Question : Heart valvular stenosis is caused by

Question : Heart of heart is:

Question : Heart muscle is sensitive to

Question : Heartis the blood bank of the body.

Question : Heart is four chambered in crocodiles, birds and________.

Question : Heart disorder in which cardiac muscles are suddenly damaged by inadequate supply of blood is

Question : Heart beats are accelerated by :-

Question : Heart beat is regulated by the working of :

Question : Heaping of earth around base of stem in Potato is meant for

Question :Healthy ecosystems are the base of wide range of (ecosystem) services. Justify. Explain the differences and the similarities between hydrarch and xerarch mccassions of plants.

Question : Healthy ecosystems are the base for a wide range of goods and services. Find outany four ecosystem services provided by a healthy forest ecosystem.

Question : Health problems caused due to heavy metal pollutants.

Question : Health complication caused by protein deficiency is

Question :Headof thespermcontainsthe ________.

Question : Head of sperm contains –

Question : he lipid like steroidal hormones are synthesized in SER among :-

Question : HCO_3^- ions formed inside RBCs diffuse out into the plasma an Cl^- ions enter intoRBCsat tissue level. The above mentioned statement is correct description of

Question : HCG, HPL, Estrogen, Progestrone, Androgen, Relaxin, Thyroxin. How many of hormones are produced in women only during pregnancy ?

Question : HbA_2 is composed of :

Question : Having becomes an expert on gel electro-phoresis, you are asked to examine a gel for a colleague, Where would you find the smallest segment of DNA?

Question : Haversian systems are seen in spongy bones.

Question : Haversian system is a feature of

Question : Haversian canal in the bone of mammals are connected by small blood vessel canal called

Question : …………have the ability to transform normal cells into cancerous cells.

Question : Have a look on the diagram given below and answer the following : (a) Whatare induced pleuripotent stem cells (IPSCs)? (b) Mention any tow features ofIPSCs.

Question : _________have dorso-ventrally flattened body.

Question : What is secondary productivity? Explain its types.

Question : Haustorial root are foundin

Question : Harmful effects caused by drug abuse.

Question : Hardy-Weinberg used the binomial expression p^2+2pq+q^2 to calculate the genotype and allele frequency of a populaiton. In this equation p is

Question : Hardy - Weinberg equilibrium is known to be affected by gene flow, genetic drift, mutation,genetic recombination and

Question : Hardy-Weinberg equilibrium is known to be affected by gene flow, genetic drift, mutation, genetic recombination and

Question : Hardy-weinberg equilibrium.

Question : Hardy Weinberg equilibrium is affected by

Question : Hardbast occurs in the stemk of Helianthus, Ricinus and few other plants. This structure represents

Question : ____hardens the tooth enamel.

Question : Haploidy, diploidy and tripoloidy are the ploidy level of angiosperm plant parts from a seed is given below. How will you give explanation to reduction of chromosome number from diploid to haploid ? 1. Integuments - outer , inner Nucellus Secondary nucleus Zygote

Question : Haploidy, diploidy and tripoloidy are the ploidy level of angiosperm plant parts from a seed is given below. Find out the chromosome status of each part.

Question : Haploids produced from microspore or pollen

Question :Haploids are more suitable for mutation studies then the diploids. This is because

Question : Haploid plants can be obtained by culturing:

Question : Haploid number of chromosomes in your body cell are

Question : Hammerling's experiments on Acetabularia involved exchanging

Question : Haploid gametes are produced in bryophytes and angiosperms by two types of cell division. Name it.

Question : Hammerling experimented on:-

Question : Halophytes occurs in