24277 + Interview Questions in Biology in Class 12 Page 438 InterviewSolution

21851.	Question : Answer whether the following statements are true of false :a.An ecological pyramid represents the species structure of a biotic community.b. A number pyramid orbiomass pyramid can be either vertical or inverted, but an energy pyramid is always vertical obeying the principles of thermodynamics.
Answer» SOLUTION :a. False b.True

Discussion

21852.	Question : Answer the question according to instructions. Diphtheria: Pathogen name, mode of transmission, incubation period.
Answer» Solution :Diphtheria (i) Pathogen: CORYNEBACTERIUM diphtheriae. (ii) Mode of Transmission: Droplets from throat discharge of patients and carriers. Portal of ENTRY is upper respiratory TRACT. (iii) Incubation Period: 12 hours to FIVE days.

Discussion

21853.	Question : Answer the question according to instructions. Barbiturate: Type of drug, clinical use.
Answer» SOLUTION :Barbiturate (i) TYPE of Drug: Sedative, CAUSING drowsiness and SLEEP. (ii) Clinical Use: To help patients cope with DEPRESSION and insomnia.

Discussion

21854.	Question : Answer the following with respect to Cancer.(a) How does a cancerous cell differ from a normal cell?(b) Bengin tumor is less dangerous than maligant tumor. Why?© Describe causes of cancer.(d) Mention two methods of treatment of the disease.
Answer» Solution :(a) In normal cells, growth and differnatiation is highly CONTROLLED and regulated (contact inhibition). The cancerous cells have lost the property of contact inhibition, hence continue to divide giving rise to masses of cells (tumors). (b) The bengin tumor remains confined in the organ affected as it is enclosed in a connective tissue sheath and does not enter the metastatic stage. (C) Cancer may be CAUSED dute to carcinogens which are PHYSICAL (X-rays, gamma rays and UV rays), chemicals (Nicotine, AFLATOXIN, Cadmium oxide,Asbestos) and biological (viral oncogens and proto oncogens). (d) Surgery, radiotherapy, Chemotherapy, immunotherapy by using biological response modifiers like `alpha`-interferons.

Discussion

21855.	Question : Answer the following: Write a note on Pollination in Vallisneria.
Answer» Solution :In VALLISNERIA, the FEMALE flowers reach the SURFACE of water by means of long stalk and pollengrains are released on to the surface of water. They are carried passively through water currents, some of them EVENTUALLY reach the stigma of the female flowers and bring out pollination.

Discussion

21856.	Question : Answer the following: What is the number of chromosomes in each of the endosperm cells of a plant that has 36 chromosomes in its meiocytes?
Answer» SOLUTION :NUMBER of chromosomes in each of the endosperm CELL is 54.

Discussion

21857.	Question : Answer the following questions referring the data below.Grey colour (b^(+)//b) , normal winged (Vg^(+)//Vg) F_1 female X Black coloured (b/b) vestigial winged (Vg/Vg) male.The offspring were grey normal 126, grey vestigial 24, black normal 26 and black vestigial 124. What ratio is expected in this cross? Does the above phenotypic ratio confirm the expected ratio?
Answer» SOLUTION :EXPECTED RATIO: 9:3:3:1 Present Ratio: 42% : 8% : 8.6% : 41.3%.

Discussion

21858.	Question : Answer the following questions on the basis of given diagrams (a,b, c and d) : Which one of the above diagrams shows axile placentation ?
Answer» a B c d Answer :B

Discussion

21859.	Question : Name the antibody which is most effective in allergies.
Answer» SOLUTION : (i) IGG

Discussion

21860.	Question : What is the function of GEAC?
Answer» Solution :GEAC (Genetic ENGINEERING Approval COMMITTEE) makes decisions and coordinates researchregarding the VALIDITY of Genetic Modification research and safety of INTRODUCING GeneticallyModified (GM) organisms for public SERVICES.

Discussion

21861.	Question : Name the common ancestor of apes and man.
Answer» SOLUTION :DRYOPITHECUS

Discussion

21862.	Question :Answer the following questions briefly and to the point: What do detritus food chains begin with?
Answer» SOLUTION :DETRITUS food chain BEGINS with DETRIVORES.

Discussion

21863.	Question :Answer the following questions briefly and to the point: What is a clone?
Answer» SOLUTION : Clone is a population of genetically identical organisms PROPAGATED ASEXUALLY from a single individual.

Discussion

21864.	Question :Answer the following questions based on Meselson and Stahl s experiment: (a) Write the name of the chemical substance used as a source of nitrogen in the experiment by them. (b) Why did the scientists synthesise the light and the heavy DNA molecules In the organism used in the experiment ? (c) How did the scientists make it possible to distinguish the heavy DNA molecule from the light DNA molecule ? Explain. ((1) Write the conclusion the scientists arrived at after completing the experiment.
Answer» Solution : (a) Ammanium chloride (`NH_4Cl`). (b) To check if DNA REPLICATION was semi-conservative. (c) The HEAVY and light DNA molecules were DISTINGUISHED by CENTRIFUGATION in a cesium chloride density gradient. (d) The scientists concluded that DN A replicates semi-conservatively.

Discussion

21865.	Question : How many chromosomes are present in meiocytes of fruit fly?
Answer» SOLUTION :4 CHROMOSOMES

Discussion

21866.	Question :Answer the following questions briefly and to the point: Give the full form of EFB.
Answer» SOLUTION :EUROPEAN FEDERATION of BIOTECHNOLOGY.

Discussion

21867.	Question :Answer the following questions briefly and to the point: Give the scientific term used for the preservation of germplasm at a very low temperature.
Answer» SOLUTION :CRYOPRESERVATION

Discussion

21868.	Question : Answer the following: List the differences between microsporogenesis and megasporogenesis.
Answer» SOLUTION :

Discussion

21869.	Question : Answer in sentence each : Write down the full form of R. F.L .P
Answer» SOLUTION :RFPLis CALLED RESTRICTION Frangment LENGTH POLYMORPHISM.

Discussion

21870.	Question : Answer in sentence each : Why PUC is mandatory for all vehicles ?
Answer» SOLUTION :(iii) Pollution Under Control (PUC) CERTIFICATE is mandatory for all vehicles and industries in order to keep a check on the amount of pollutants being emitted by these sources. Highly polluting industries such as iron, steel, power plants are strictly monitored, a SET of rules and REGULATIONS are provided to them. Only those vehicles and industries which are practicing these regulations are legally certified to exist and function in the ENVIRONMENT.

Discussion

21871.	Question : A family of five daughter only is expecting sixth issue. The Chance of its beings a son is
Answer» zero 25% 50% 100% SOLUTION :50%

Discussion

21872.	Question : Answer appropriately as per the same given below : Lichens to Herbs to Shrubs to Forest. (i) Mention the name of missing seral stage. (ii) What type of environment conditions occurs in climax community ?
Answer» SOLUTION :(i) Lichens `to` Bryophytes `to` HERBS `to` Shrubs `to` Forest. (II) Mesic conditions.

Discussion

21873.	Question : ANDi is the cloned
Answer» SHEEP bull monkey cat Answer :C

Discussion

21874.	Question : Anoxygenic photosynthesis is characteristic of
Answer» RHODOSPIRILLUM SPIROGYRA CHLAMYDOMONAS Ulva Answer :A

Discussion

21875.	Question : Anoxygenic photosynthesis do not involved
Answer» PHOTOSYSTEMS ATP SYNTHESIS `CO_2`fixation Photolysis of WATER Answer :D

Discussion

21876.	Question : Another term for cross-pollination is(A)allogamy(B) xenogamy(C) both above(D) autogamy
Answer» allogamy xenogamy both above autogamy Answer :C

Discussion

21877.	Question : Another term for cold-blooded animals is :
Answer» ENDOTHERM ECTOTHERM Homoiotherm THERMOREGULATOR ANSWER :B

Discussion

21878.	Question : Another name'for birth canal.
Answer» SOLUTION :VAGINA.

Discussion

21879.	Question : Another name for secondary constriction of a chromosome.
Answer» SOLUTION :Nucleolar ORGANIZER

Discussion

21880.	Question : Another name for Tailing of hnRNA _____
Answer» SOLUTION :POLYADENYLATION

Discussion

21881.	Question : Another name for synonymous mutations _____
Answer» SOLUTION :SILENT MUTATIONS

Discussion

21882.	Question : Another name for Reproductive propagules …..
Answer» SOLUTION :DIASPORES

Discussion

21883.	Question : Another name for adult stem cell.
Answer» SOLUTION :SOMATIC STEM CELLS.

Discussion

21884.	Question : Distinct annual rings are seen in plants growing in _____ regions
Answer» ANSWER :TEMPERATE

Discussion

21885.	Question : annual NPP of whole biosphere is approximately ______ tons (dry weight) of organic matter
Answer» 170 millions 115 BILLION 55 billion 265 billion Answer :A

Discussion

21886.	Question : Annelids are classified on basis of their:
Answer» Segmentation Gonads Locomotory structures Coelom Answer :C

Discussion

21887.	Question : Annual migration does not occur in the case of:
Answer» Salamander Salmon Arctic tern siberian crane Answer :A

Discussion

21888.	Question : Annual migration does not occur in
Answer» ARC tern Salamander Salmon Siberian CRANE ANSWER :B

Discussion

21889.	Question : Explain Anisogametes
Answer» SOLUTION :When two morphologically and PHYSIOLOGICALLY DISTINCT types of gametes are formed they are called as ANISOGAMETES.

Discussion

21890.	Question : Animals with self- fertilizing ability is called _____.
Answer» ANSWER :HERMAPHRODITE

Discussion

21891.	Question : Animals which see well during night have abundant
Answer» Rods Cones SCOTOPIC CELLS NIGHT VISION cells Answer :A

Discussion

21892.	Question : Animals who give birth to young one are (A) Oviparous (B) Viviparous (C) Ovoviviparous (D) None of the above
Answer» OVIPAROUS VIVIPAROUS OVOVIVIPAROUS NONE above Answer :B

Discussion

21893.	Question : Animals undergoes inactive stage during winter is known as:
Answer» ADAPTATION Aestivation Hibernation acclimatization Answer :C

Discussion

21894.	Question : Animals that have their DNA manipulated to posses and express an extra gene are known as
Answer» FOREIGN ANIMALS Superior animals TRANSGENIC animals Intergenic animals SOLUTION :Transgenic animals

Discussion

21895.	Question : Animals undergo inactive stage during winters. It is called
Answer» ACCLIMATISATION Hibernation Aestivation ADAPTATION ANSWER :B

Discussion

21896.	Question : Animals that have had their DNA manipulated to possess and express a foreign are called
Answer» TRANSGENIC animals somatic hybrids somaclones super animals Solution :The animals which carry FOREIGN genes are CALLED transgenic animals. The foreign genes inserted into the genome of the animal using recombinant DNA technology are called transgenes.

Discussion

21897.	Question : Animals that have had their DNA manipulated to possess and express an extra gene are known as:
Answer» FOREIGN animals Superior animal Transgenic animal Intergenic animal Answer :C

Discussion

21898.	Question : Animals that can move from fresh water to sea called as ……….. .
Answer» Stenothermal EURYTHERMAL CATADROMOUS ANADROMOUS SOLUTION :Catadromous

Discussion

21899.	Question : Animals in cold regions have a fur because:
Answer» they like fur fur traps air hair is a good INSULATING material they maintain LOW METABOLIC material Answer :C

Discussion

21900.	Question : Animals of colder climates generally have smaller limbs. This is called :
Answer» NICHE rule ALLEN's rule Ehrilch rule NONE of these Answer :B

Discussion

Explore topic-wise InterviewSolutions in .

Question : Answer the question according to instructions. Diphtheria: Pathogen name, mode of transmission, incubation period.

Question : Answer the question according to instructions. Barbiturate: Type of drug, clinical use.

Question : Answer the following with respect to Cancer.(a) How does a cancerous cell differ from a normal cell?(b) Bengin tumor is less dangerous than maligant tumor. Why?© Describe causes of cancer.(d) Mention two methods of treatment of the disease.

Question : Answer the following: Write a note on Pollination in Vallisneria.

Question : Answer the following: What is the number of chromosomes in each of the endosperm cells of a plant that has 36 chromosomes in its meiocytes?

Question : Answer the following questions on the basis of given diagrams (a,b, c and d) : Which one of the above diagrams shows axile placentation ?

Question : Name the antibody which is most effective in allergies.

Question : What is the function of GEAC?

Question : Name the common ancestor of apes and man.

Question :Answer the following questions briefly and to the point: What do detritus food chains begin with?

Question :Answer the following questions briefly and to the point: What is a clone?

Question : How many chromosomes are present in meiocytes of fruit fly?

Question :Answer the following questions briefly and to the point: Give the full form of EFB.

Question :Answer the following questions briefly and to the point: Give the scientific term used for the preservation of germplasm at a very low temperature.

Question : Answer the following: List the differences between microsporogenesis and megasporogenesis.

Question : Answer in sentence each : Write down the full form of R. F.L .P

Question : Answer in sentence each : Why PUC is mandatory for all vehicles ?

Question : A family of five daughter only is expecting sixth issue. The Chance of its beings a son is

Question : Answer appropriately as per the same given below : Lichens to Herbs to Shrubs to Forest. (i) Mention the name of missing seral stage. (ii) What type of environment conditions occurs in climax community ?

Question : ANDi is the cloned

Question : Anoxygenic photosynthesis is characteristic of

Question : Anoxygenic photosynthesis do not involved

Question : Another term for cross-pollination is(A)allogamy(B) xenogamy(C) both above(D) autogamy

Question : Another term for cold-blooded animals is :

Question : Another name'for birth canal.

Question : Another name for secondary constriction of a chromosome.

Question : Another name for Tailing of hnRNA _____

Question : Another name for synonymous mutations _____

Question : Another name for Reproductive propagules …..

Question : Another name for adult stem cell.

Question : Distinct annual rings are seen in plants growing in _____ regions

Question : annual NPP of whole biosphere is approximately ______ tons (dry weight) of organic matter

Question : Annelids are classified on basis of their:

Question : Annual migration does not occur in the case of:

Question : Annual migration does not occur in

Question : Explain Anisogametes

Question : Animals with self- fertilizing ability is called _____.

Question : Animals which see well during night have abundant

Question : Animals who give birth to young one are (A) Oviparous (B) Viviparous (C) Ovoviviparous (D) None of the above

Question : Animals undergoes inactive stage during winter is known as:

Question : Animals that have their DNA manipulated to posses and express an extra gene are known as

Question : Animals undergo inactive stage during winters. It is called

Question : Animals that have had their DNA manipulated to possess and express a foreign are called

Question : Animals that have had their DNA manipulated to possess and express an extra gene are known as:

Question : Animals that can move from fresh water to sea called as ……….. .

Question : Animals in cold regions have a fur because:

Question : Animals of colder climates generally have smaller limbs. This is called :