24277 + Interview Questions in Biology in Class 12 Page 280 InterviewSolution

13951.	Question : Logo of which wildlife organisation is given below :
Answer» BNHS WWF IUCN UNCED Answer :B

Discussion

13952.	Question : It is useful in diagnosis of chromosomal abnormality before birth ?
Answer» AFT GIFT ZIFT ART ANSWER :A

Discussion

13953.	Question : Locomotory structure of Leech is/are
Answer» Parapodia Setae Muscle All of these Answer :C

Discussion

13954.	Question : Locomotary speed of an organism changes due to light. This phenomenon is referred as.........
Answer» PHOTONASTY PHOTOKINESIS Phototropism Phototaxis Solution :Photokinesis

Discussion

13955.	Question :It is used by people to keep awake at night.
Answer» BARBITURATES AMPHETAMINE LSD THC SOLUTION :Amphetamine

Discussion

13956.	Question : Lock jaw is a characteristic feature of which of the following disease?
Answer» Tetanus Leprosy Cholera Bubonic plague Answer :A

Discussion

13957.	Question :Locations or sites in the human DNA where single base DNA differences occur are called
Answer» REPETITIVE DNA VNTR SNP SSCP ANSWER :C

Discussion

13958.	Question : It is the enzymatic conversion of the decomposing detritus to simpler compounds and inorganic substance is called1)Fragmentation2)Leaching3)Catabolism4)Humification
Answer» Fragmentation Leaching Catabolism Humification Answer :C

Discussion

13959.	Question : Location of a particular gene on sex chromosome or autosomes can be identified by -
Answer» TEST cross Out cross Back cross Reciprocal cross Answer :D

Discussion

13960.	Question : Local hormone of the following is
Answer» Somatostatin ACTH Thyrocalcitonin Thyroxine Answer :A

Discussion

13961.	Question : It is surrounded on mature ovum and its surface.
Answer» FOLLICLES Ovarion follicles Graafian follicles Both (A) and (B) ANSWER :C

Discussion

13962.	Question : Local anaesthtic drugs, results in insensitivity to pain due to
Answer» INHIBITING INFLUX `K^+` inhibiting EFFLUX `K^+` inhibiting efflux `Na^+` inhibiting influx `Na^+` Answer :D

Discussion

13963.	Question : It is suggested to supply Atlas-66 variety of wheat grains to the malnutrient communities Name the technologyused to produced Atlas - 66?Explain it
Answer» SOLUTION :BIOFORTIFICATION

Discussion

13964.	Question :Loamy soil is ideal for crop cultivation - Justify.
Answer» Solution :Loamy soil is ideal soil for cultivation, since it consists of 70% sand and 30% clay or silt or both. It ENSURES good RETENTION and proper DRAINAGE of water. The porosity of soil provides adequate aeration and allows the penetration of roots.

Discussion

13965.	Question : ln F_(2) generation of a Mendelian dihybrid cross ("TTRR" xx ttrr)
Answer» Tall plants and violet floweredplants are OBTAINED in 1 : 1 frequency Ratio of parental and non-parental plants is `1 : 15` RECOMBINANT plants are obtained in `1 : 1` frequency More than one OPTION is correct Answer :D

Discussion

13966.	Question : LNG-20 is
Answer» IUI IUT IUD IFT Answer :C

Discussion

13967.	Question : lnspiratoty centre ts located in:
Answer» Cerebellum Cerebrum Hypothalamus Medulla oblongata Answer :D

Discussion

13968.	Question : What is the term for the living organisms on which parasites grow?
Answer» ANSWER :HOST

Discussion

13969.	Question : Living organisms are capable of extracting energy from(i)and store it in the form of(ii)
Answer» (i) Oxidisable SUBSTANCE, (ii) Starch only (i) LIGHT, (ii) Glucose only (i) Oxidisable substance, (ii) BOND energy (i) Sun directly, (ii) Bond energy Answer :C

Discussion

13970.	Question : Living organisms can be unexceptionally distinguished from the non-living things on the basis of their ability for :
Answer» Consciousness Reproduction Growth and movement Responsivenessto touch Answer :A

Discussion

13971.	Question : Living fossil:-
Answer» CYCAS GINKGO PSILOTUM All the above ANSWER :D

Discussion

13972.	Question : It is said the earth has formed about 4.5 billion years back. How did the earth crust and atmosphere formed according to Big Bang theory?
Answer» Solution :It is said there was no atmosphere on early earth and the earth was a HOT ball of gases. With the passage of years, the gases CONDENSED into a molten core and different ELEMENTS got stratified according to their density. Heavy elements such as iron, nickel etc. sank DEEP into centre and FORMED the core. Lighter elements like silicon, aluminium etc. formed the middle layer, while the lighter elements like hydrogen, helium, nitrogen etc. formed the gaseous part.

Discussion

13973.	Question : Living cells providing mechanical and tensile strength are :
Answer» Parenchyma Chlorenchyma· Collenchyma SCLERENCHYMA ANSWER :C

Discussion

13974.	Question : Liver is____in origin.
Answer» Ectodermal Endodermal Mesodermal Both a and B Answer :B

Discussion

13975.	Question : Liver is the chief excretory organ in man.
Answer» ANSWER :KIDNEY

Discussion

13976.	Question : Littoral zone is found along
Answer» HIGH MOUNTAIN SEA River DESERT SOLUTION :Sea

Discussion

13977.	Question : Live specimens are kept in museum.
Answer» ANSWER :ZOO

Discussion

13978.	Question : It is said that Mendel proposed that the factor controlling any character is discrete and independent. His proposition was based on the
Answer» A. Results of `F_3` GENERATION of a cross B. Observations that the offspring of a cross made between the plants having two contrasting characters shows only one CHARACTER without any BLENDING. C. Self POLLINATION of `F_1` off springs D. Cross pollination of `F_1` generations with recessive parental Solution :MENDEL proposed that the factor controlling any character is discrete and independent. His proposition was based on the observations that the offspring of a cross made between the plants having two contrasting characters shows only one character without any blending.

Discussion

13979.	Question : Litter is composed by how many organisms among the following ? Earthworm, Bacteria, Fungi, Mites
Answer» 1 2 3 4 Solution :4

Discussion

13980.	Question : It is said, that the harmful alleles get eliminated from population over a period of time, yet sickle cell anaemia is persisting in human population. Why?
Answer» Solution :The harmful alleles get eliminated from population over a period of time, yet sickle cell anaemia is persisting in human population because SCA is a harmful CONDITION which is also a potential SAVIOUR from malaria. Those with the benign sickle trait possess a resistance to malarial infection. The pathogen that causes the DISEASE spends part of its cycle in the red blood cells and triggers an abnormal drop in oxygen levels in the cell. In carriers, this drop is sufficient to trigger the full sickle-cell reaction, which leads to infected cells being rapidly removed from circulation and STRONGLY limiting the infection.s progress. =These individuals have a great resistance to infection and have a greater chance of surviving outbreaks. This resistance to infection is the main reason the SCA allele and SCA disease still exist It is found in greatest frequency in populations where malaria was and often still is a SERIOUS problem

Discussion

13981.	Question : List10 modern-day animals and using the internet resources link it to a corresponding ancient fossil. Name both.
Answer» SOLUTION :BROWSE INTERNET

Discussion

13982.	Question : List various natural methods of birth control.
Answer» Solution :1. Periodic ABSTINENCE 2. COITUS interruptus 3. Lactational amenorrhea

Discussion

13983.	Question : It is said that Mendel proposed that the factor controlling any character is descrete and independent. His proposition was based on the
Answer» RESULTS of `F_(3)` generation of a CROSS Observation that the offspring of a cross made between the plants having TWO constrsting characters shows only one character without any blending. Self pollination of `F_(1)` offsprings Cross pollination of `F_(1)` GENERATIONS with recessive parental. Answer :B

Discussion

13984.	Question : List two essential roles of ribosome during translation.
Answer» Solution :i. Ribosome is the CELLULAR FACTORY for synthesizing proteins. ii. Ribosome acts as a CATALYST in bacteria for the formation of peptidebond.

Discussion

13985.	Question : It is said, that diseases are spreading faster due to globalisation and increased movement of people. Justify the statement taking the example of H_5N_1 virus.
Answer» Solution :DISEASES are spreading faster due to GLOBALISATION and increased movement of PEOPLE because it is responsible for rapid spreading of infectious diseases. The avian flu is a CURRENT and significant issue involving the global environment as WELL as health of millions around the world. Once it has developed the ability to spread easily from human to human so it spreads rapidly.

Discussion

13986.	Question : List three strategies that a bisexual chasmogamous flower can evolve to prevent self pollination (autogamy)
Answer» Solution :In chasmogamos BISEXUAL flowers to prevent self fertilisation following three phases are evolutioned. (A) Dichogamy: In this METHOD pollen grain is released But for acceptance of STIGMA is self incompatible. In sunflower before stigma matures and accepts pollen grain, pollen grains are released. In Dhature solenum before pollen grains are released, stigma is prepared so cross pollination can be possible. (B) Herkogamy: When male and female reproductive ORGANS are kept in different situation and in different directions it is called Herkogamy. In these plants pollen grain cannot come in contact of stigma of the same flower.So cross pollination occurs eg. Hibiscus and Glorissa. (C ) Self sterility: This is a genetic type method. If prevents germination of pollen grain and growth of pollen tube in pistil e.g Abotilon. Note: In another method to prevent self pollination, the method is to produce unisexual flowers, which is not ADVANTAGEOUS. This prevents self fertilisation but in castor and maize like plants, Geitonogamy can not be prevented

Discussion

13987.	Question : List three mechanisms by which variant genotypes can be produced in nature.
Answer» Solution :Mutation in genes and chromosomes, RECOMBINATION of genes and HYBRIDISATION of genes

Discussion

13988.	Question : List three reasons for population explosion.
Answer» Solution :i) An all round development in various fields has significantly improved the quality of LIFE of the people ii) INCREASE health facilities along with BETTER living conditions iii) A rapid decline in death rate, maternal MORTALITY rate (MMR) and infant mortality rate (IMR) iv) An increase in number of people in reproducible AGE.

Discussion

13989.	Question : List the ways by which seeds can be stored for longer duration.
Answer» Solution :Methods of Seed Storage: (i) Conventional Methods of Seed Storage: Conventional Methods of Seed Storage: Conventional storage includes storage in Bamboo structure, mud and earthen structure, wooden structure and underground structure. In village level storage is done in large level in concrete/cement silos, Metal or plastic drums and metal silos. Improved rural level storage structure includes storage in coal tar drum, udaipur bin, bamboo bin, pusa bin and metal bins. (ii) Modern Methods of Seed Storage : (a) Seed storage in cryopreservation: It is the technique of germplasm conservation ( storage of cells, tissue, embryo or seeds) by ultra-low temperature in liquid nitrogen at `-196^(@)C`. It is not practical for commercial seed storage purpose, but is useful to store the VALUABLE germplasm for use in future which cannot be preserved by conventional methods. (b) Seed storage in gene bank: In gene bank, seed storage is the preservation of seed under controlled environmental condition which will prolong the viability of the seeds for long periods. The temperature, RELATIVE humidity and seed moisture content. Containers and distribution arrangement vary for each and every type of seed. (c) SVALBARD seed bank: The seeds are stored in four ply sealed envelopes, and then placed into plastic tote containers on metal shelving racks. The storage rooms are kept at `-18^(@)C`. The low temperature and limited access to `O_(2)` will ensure low METABOLIC activity and delayed seed ageing. The permafrost surrounding will help to maintain low temperature of the seed when the electricity supply fails.

Discussion

13990.	Question : List the various markers that are used in DNA finger printing.
Answer» Solution :DIFFERENT DNA marker systems such as Restriction Fragment Length Polymorphisms (RFLPS), Random Amplified Polymorphic DNAS (RAPDs), Amplified Fragment Length Polymorphisms (AFLPs), Simple Sequence Repeats (SSRs) which also called as microsatellites, Single NUCLEOTIDE Polymorphisms (SNPs) and OTHERS have been developed.

Discussion

13991.	Question : List thevariousabiotiocenvirommental factor.
Answer» Solution :ABIOTIC factorsinclude climatic factors( temperature light air atomosphericnumiditypreciption and water )and EDAPHIC factor (soiltexturesubstratumtopography BACKGROUND MINERALS and pH)

Discussion

13992.	Question : List the various abiotic environmental factors
Answer» Solution :(i) Atmospheric factors : LIGHT temperature , wind and water. (ii) Edaphic factors : SOIL water, soil texture, soil micro ORGANISMS, soil pH, MINERALS.

Discussion

13993.	Question : List the two types of nutrient cycles.
Answer» Solution :NUTRIENT cycles are of TWO TYPES : (a) GASEOUS and (b) sedimentary.

Discussion

13994.	Question : List the various abiotic environmental factors.
Answer» Solution :• Abiotic FACTORS INCLUDE climatic factors, such as light, wind, water, temperature and humidity and edaphic factors, such as SOIL TEXTURE, pH, minerals, TOPOGRAPHY and substratum.

Discussion

13995.	Question : It is said that "Chikungunya" once affected,will not affect a person in the naxt half of his life. Justify this statement.
Answer» Solution :It is speciality of our immune system. In acquired immunity memory CELLS are PRODUCED and they will be active for a LONG time SPAN. Chickungunya if AFFECTED once, gives long-lasting active immunity.

Discussion

13996.	Question : List the two types of immunity a human baby is born with. Explain the differences between the two types.
Answer» Solution :The two types of immunity are innate and PASSIVE immunity. Innate Immunity is a non-specificty pe of defenceth at proyides barriers to the entry of antigens. Passive Immunity is a PATHOGEN-specific type of defence that develops in RESPONSE to encounter with pathogen. The FOETUS RECEIVES antibodies through the placenta.

Discussion

13997.	Question : It is said that "Chikunguinea' once affected will not affect a person in the next half of his life. As a student of biology, can you justify this statement
Answer» Solution :Our body produces the T-lymphocytes against the antigen i.e., Chickunguinea causing agent and they attack and destroy the antigen. Some of the T-cells get differentiated into memory T-cells. These cells are STORED in the lymph nodes and spleen. They recognise and produce antibodies when the same attack the body a second time. This is a very rapid PROCESS. Memory T-cells have a LONG LIFE. These cells are responsible for the life long immunity to certain diseases LIKE Chikunguinea.

Discussion

13998.	Question : List the two main propositions of Oparin and Haldane.
Answer» Solution : Oparin and Haldane PROPOSED that "irst form of life could have come from pre-existing non-Living organic molecules (eg. RNA. PROTEIN etc.) and that FORMATION of life was preceded by chemical evolution, le formation of diverse organic molecules from inorganic constituents The conditions on earth were high temperature. volcanic storms,reducing atmosphere containing `CH_4, NH_3`.etc. Reducing atmosphere promoted INCREASED synthesis of energy rich molecules and abiotic synthesis of complex organic molecules took place

Discussion

13999.	Question : It is present in acrosome.
Answer» MITOCHONDRIA HYALURONIDASE NUCLEOUS Ribosomes Answer :B

Discussion

14000.	Question : List the two main propositions of Oparin and Haldane
Answer» Solution :Oparin and Haldane stated that (i)life originated from pre-existing non-living organic MOLECULES e.g. RNA, Protein etc. (II)The conditions on earth FAVOURING chemical evolution were having high temperature , VOLCANIC STORMS , reducing atmosphere containing `CH_4, NH_3` etc.

Discussion

Explore topic-wise InterviewSolutions in .

Question : Logo of which wildlife organisation is given below :

Question : It is useful in diagnosis of chromosomal abnormality before birth ?

Question : Locomotory structure of Leech is/are

Question : Locomotary speed of an organism changes due to light. This phenomenon is referred as.........

Question :It is used by people to keep awake at night.

Question : Lock jaw is a characteristic feature of which of the following disease?

Question :Locations or sites in the human DNA where single base DNA differences occur are called

Question : It is the enzymatic conversion of the decomposing detritus to simpler compounds and inorganic substance is called1)Fragmentation2)Leaching3)Catabolism4)Humification

Question : Location of a particular gene on sex chromosome or autosomes can be identified by -

Question : Local hormone of the following is

Question : It is surrounded on mature ovum and its surface.

Question : Local anaesthtic drugs, results in insensitivity to pain due to

Question : It is suggested to supply Atlas-66 variety of wheat grains to the malnutrient communities Name the technologyused to produced Atlas - 66?Explain it

Question :Loamy soil is ideal for crop cultivation - Justify.

Question : ln F_(2) generation of a Mendelian dihybrid cross ("TTRR" xx ttrr)

Question : LNG-20 is

Question : lnspiratoty centre ts located in:

Question : What is the term for the living organisms on which parasites grow?

Question : Living organisms are capable of extracting energy from(i)and store it in the form of(ii)

Question : Living organisms can be unexceptionally distinguished from the non-living things on the basis of their ability for :

Question : Living fossil:-

Question : It is said the earth has formed about 4.5 billion years back. How did the earth crust and atmosphere formed according to Big Bang theory?

Question : Living cells providing mechanical and tensile strength are :

Question : Liver is____in origin.

Question : Liver is the chief excretory organ in man.

Question : Littoral zone is found along

Question : Live specimens are kept in museum.

Question : It is said that Mendel proposed that the factor controlling any character is discrete and independent. His proposition was based on the

Question : Litter is composed by how many organisms among the following ? Earthworm, Bacteria, Fungi, Mites

Question : It is said, that the harmful alleles get eliminated from population over a period of time, yet sickle cell anaemia is persisting in human population. Why?

Question : List10 modern-day animals and using the internet resources link it to a corresponding ancient fossil. Name both.

Question : List various natural methods of birth control.

Question : It is said that Mendel proposed that the factor controlling any character is descrete and independent. His proposition was based on the

Question : List two essential roles of ribosome during translation.

Question : It is said, that diseases are spreading faster due to globalisation and increased movement of people. Justify the statement taking the example of H_5N_1 virus.

Question : List three strategies that a bisexual chasmogamous flower can evolve to prevent self pollination (autogamy)

Question : List three mechanisms by which variant genotypes can be produced in nature.

Question : List three reasons for population explosion.

Question : List the ways by which seeds can be stored for longer duration.

Question : List the various markers that are used in DNA finger printing.

Question : List thevariousabiotiocenvirommental factor.

Question : List the various abiotic environmental factors

Question : List the two types of nutrient cycles.

Question : List the various abiotic environmental factors.

Question : It is said that "Chikungunya" once affected,will not affect a person in the naxt half of his life. Justify this statement.

Question : List the two types of immunity a human baby is born with. Explain the differences between the two types.

Question : It is said that "Chikunguinea' once affected will not affect a person in the next half of his life. As a student of biology, can you justify this statement

Question : List the two main propositions of Oparin and Haldane.

Question : It is present in acrosome.

Question : List the two main propositions of Oparin and Haldane