24277 + Interview Questions in Biology in Class 12 Page 318 InterviewSolution

15851.	Question : How molecular biology can be used for treatment and detection of cancer?
Answer» Solution :Antibodies against cancer specific antigens are ALSO used for detection of certain CANCERS. TECHNIQUES of molecular biology can be applied to detect genes in individuals with inherited susceptibility to certain cancers. Identification of such genes, which predispose an individual to certain cancers, may be very helpful in prevention of cancers. Such individuals may be ADVISED to avoid exposure to particular carcinogens to which they are susceptible.

Discussion

15852.	Question : How modern biotechnology differs from conventional biotechnology ?
Answer» Solution :There are TWO MAIN features of modern biotechnology, that differentiated it from the conventional technology are its : (i) ABILITY to change the genetic material for getting new products with specific requirement through RECOMBINANT DNA technology (ii) ownership of the newly developed technology and its SOCIAL impact.

Discussion

15853.	Question : How microbial enzymes are produced ? Mention its significance.
Answer» Solution :When microbes are CULTURED , they secrete some ENZYMES into the growth media. These enzymes are industrially used in detergents , FOOD processing , brewing and PHARMACEUTICALS. E.g. Protease , amylase , ISOMERASE , and lipase.

Discussion

15854.	Question : How microbes are used in Gobar gas production ?
Answer» Solution :Biogas is a mixture of different gases produced by the breakdown of organic matter in the absence of oxygen Biogas can be produced from raw materials such as agricultural wastes, manure municipal wastes , plant material sewage food waste , etc Biogas is produced under anaerobic condition when the organic fertilizer Biogas PRIMARILY consists of methane (63 PERCENT), along with `CO_(2)` and hydrogen Methane producing bacteria are called methanogens and one such common bacterium is Methanobacterium Biogas is devoid of smell and burns with a blue flame without smoke . The Methanogens are also present in anaerobic sludge and rumen of cattle In rumen , these bacteria help in the breakdown of cellulose . Theexcreta of cattle called dung is commonly called Gobar gas is generated by the anaerobic decomposition of cattle is commonly called Gobar . Gobar gas is generated by the anaerobic decomposition of cattle dung . It consists if methane `CO_(2)` with some hydrogen nitrogen and other gases in trace amounts. In a biogas plant anaerobic digestion is carried out in an air TIGHT cylindrical tank known as digester . It is made up of concrete bricksand cement or steel Bio - wastes are collected and slurry of dung is fed into this digester . It has a side OPENING into which organic materials for digestion are incorporated formicrobial activity . Anaerobic digestion is accomplished in three stages : solubilisation acidogenesis and methanogenisis . The outlet and is used as fertilizer . Biogasis used for cooking and lighting . the TECHNOLOGY of biogas production was developed in India mainly due to the efforts of Indian Agricultural Research Institute (IARI) and Khadi and Village Industries Commission (KVIC).

Discussion

15855.	Question : How may of the followingstatements is / are correct ? (a) In domesticated fowls , sex of progeny depends upon the type of sperm rather than type of egg. (b) Haemophilia is sex - linked recessive disorder. (c ) Multiple alleles are present at the same locus of homologous chromosomes . . (d) In codominance F_1 generation resembles both the parents.
Answer» FOUR Three Two One Solution :Filiform apparatus is FINGER - like projection PRESENT TOWARDS the micropylar end of the cell wall of synergids Filiform apparatus guides the entry of pollen tube into synergids

Discussion

15856.	Question : How may ATP molecules are needed to produce 4 molecules of NH3 during symbiotic N2 fixation by Rhizobium leguminosarum in root Nodule ?
Answer» 32 24 16 12 Answer :A

Discussion

15857.	Question : How many zoos are in the world ?
Answer» 1800 More than 800 1400 1600 Solution :More than 800

Discussion

15858.	Question : How many years is life spam of a parrot ?
Answer» ANSWER :140 YEARS

Discussion

15859.	Question : How many years are considered in one minute in Geological clock?
Answer» 52000 YEARS 1,87,500,000 years 3,25,000 years 1,90,000 years SOLUTION : 3,25,000 years

Discussion

15860.	Question : How many years before modern man started?
Answer» 7000 8000 9000 10000 Solution :8000

Discussion

15861.	Question : How many years ago earth was originated ?
Answer» 4000 MILLION 5000 million 2000 million 3000 million SOLUTION :5000 million

Discussion

15862.	Question : How many year does a tortoise live ?
Answer» ANSWER :100-150 YEARS

Discussion

15863.	Question : How many X-chromosomes are present in male grasshopper ?
Answer» ANSWER :1

Discussion

15864.	Question : How many XMP are formed in calvin cycle for the production of one glucose molecule
Answer» 2 3 4 6 Answer :C

Discussion

15865.	Question : How many words co-relate with accessory excretory organs? Skin, Lungs, Liver, Pancreas, Intestine, Mouth
Answer» Four Three Five Two Answer :A

Discussion

15866.	Question : How many worker bees are there in a good and well-developed colony of bees?
Answer» 40,000 to 50,000 45,000 to 50,000 35,000 to 55,000 30,000 to 50,000 SOLUTION : 30,000 to 50,000

Discussion

15867.	Question : How many wisdom teeth are present in a man?
Answer» ANSWER :4

Discussion

15868.	Question : How many vertebrae are present in a baby ?
Answer» ANSWER :33

Discussion

15869.	Question : How many types of zygotic combinations are possible between a cross AaBBCcDd × AAbbCcDD?
Answer» 32 128 64 16 Answer :D

Discussion

15870.	Question : How many variable segments are present in the basic structure of antibody molecules?
Answer» ONE Two Three FOUR Solution :Four

Discussion

15871.	Question : How many varieties of rice has been estimated to be present in India ?
Answer» 2000 20000 200000 2000000 Answer :C

Discussion

15872.	Question : How many types of tissue systems are present in plants on the basis of morphology and location according to Van sachs
Answer» 1 4 2 3 Answer :D

Discussion

15873.	Question : How many types of spindles are forms during cell division in Eukaryotes :-
Answer» 3 4 5 2 Answer :A

Discussion

15874.	Question : How many types of RNA polymerase required for RNA synthesis ?
Answer» In prokaryotes, three different types of RNA polymerase arerequired, where RNA polymerase II transcribes mRNA GENES and 5S rRNA genes. In eukaryotes, three different types of RNA polymerase are required, where RNA polymerase II transcribes mRNA genes and 5S rRNA genes. In eukaryotes, three different types of RNA polymerase are required, where RNA polymerase II transcribes mRNA and hnrna In eukaryotes, fivedifferent types of RNA polymerase are required, where RNA polymeraseIII transcribes mRNA, MIRNA snRNA and SNORNA qenes. Answer :C

Discussion

15875.	Question : How many types of gametes are produced from individual of AABBCcDdee genotype
Answer» 4 8 5 7 Answer :A

Discussion

15876.	Question : How many types of gametes are produced by heterozygous dihybrid plant with a genotype RrYy ? Write them .
Answer» SOLUTION :FOUR GAMETES - RY, Ry , rY , ry

Discussion

15877.	Question : How many types of gametes are produced by a dihybrid plant. If the same plant is self fertilized , how many second generation offspring are developed ?
Answer» Solution :Four different GAMETES are produced by a dihybrid plant and on selfing , it YIELD 16 OFFSPRINGS.

Discussion

15878.	Question : How many types of gametes are formed by a plant having AaBbCc genotype, in which A & B genes shows complete linkage.
Answer» 2 4 6 8 Answer :B

Discussion

15879.	Question : How many types of corolla are there in petals
Answer» 5 10 7 8 Answer :B

Discussion

15880.	Question : How many types of gametes are obtained from a plant of genotype TTRr?
Answer» one two four many Answer :B

Discussion

15881.	Question : How many types of DNA polymerases does an eukaryotic cell possess?
Answer» two three four FIVE Solution :five

Discussion

15882.	Question : How many types of combinations of gametes are possible in a monohybrid F_(1) parents
Answer» TWO Four Six Eight Answer :A

Discussion

15883.	Question : How many types of animal breeding methods are there?
Answer» 2 3 4 5 Solution :3

Discussion

15884.	Question : How many types of anticodons are present ?
Answer» UNCOUNTABLE 61 3 64 Solution :61

Discussion

15885.	Question : How many type of gametes are produced by a plant having genotypes AaBbCcDd, AABBCCDD, aaBbCcDd and aabbccDd respectively ?
Answer» 16,2,8,2 16,1,8,1 16,1,8,2 16,8,1,2 Answer :C

Discussion

15886.	Question : how many turns of Calvin cycle yield one molecule of glucose?
Answer» 8 2 6 4 Solution :Conversion of `CO_(2)` to simple (REDUCED) organic compounds is called `CO_(2)` assimilation or `CO_(2)` fixation or carbon fixation. This fixation pathway was elucidated in the early 1950S by MELVIN calvin and Coworkens and is often called as calvin cycle. Since, one molecule of carbon is fixed in one turn of the calvin cycle. so, six turns of the cycle are required to fix the glucose MOLECULES containing 6 carbon atoms.

Discussion

15887.	Question : How many times , non steroid pills can be taken as contraceptive ?
Answer» Once a WEEK TWICE a week Once after MENSTRUATION Any TIME after menstruation Answer :A

Discussion

15888.	Question : How many times / minutesa normal human heart beats ?
Answer» ANSWER :72

Discussion

15889.	Question : How many transgenic varieties of basmati rice are grown in India ?(A) 2,00,000(B) 50000(C) 1000(D) 27
Answer» 200000 50000 1000 27 Solution :27

Discussion

15890.	Question : How many times meiotic division will take place to produce 512 pollen grains?
Answer» 128 100 256 50 Solution :Number of MEIOSIS required for FORMATION of 'N' number of pollen grains is `(n)/(4)`. So, the required number of meiosis is 512/4=128 division.

Discussion

15891.	Question : How many time dose a molecule of urea have to pass through the heart in its journey from liver to kidney ?
Answer» 0 1 2 4 Answer :C

Discussion

15892.	Question : How many tetrads are visible in human meiocyte?
Answer» 46 23 46 pairs 23 pairs Answer :B

Discussion

15893.	Question : How many terms in the column is associated to stonewort? Protandrous, Gynandrous, Shield cells, Coronary cells, Tube cells, Archegoniophore, Globule, Monoecious
Answer» 5 6 7 4 Answer :B

Discussion

15894.	Question : How many terms are related with kingdom Protista Zygote, Embryo, Cilia, Pili, Pellicle, water bloom, Nitrogen fixation, Photosynthesis, Pseudopodia, tissue, Heterocyst
Answer» 6 5 8 7 Solution :ZYGOTE, Cilia, Peelicle, WATER bloom, PHOTOSYNTHESIS, PSEUDOPODIA.

Discussion

15895.	Question : How many synergid cells are there in an mature embryo sac . Mention any two major role of synergids.
Answer» SOLUTION :The EGG apparatus TWO synergids. Synegids chemotropic substances that attracts the POLLEN tube. Synergids also guids the pollen tube into the egg.

Discussion

15896.	Question : How many substrate level phosphorylation take place in glycolysis
Answer» 1 2 3 4 Answer :D

Discussion

15897.	Question : How many structures in the list given below are haploid? Spermatid, secondary oocyte, primary spermatocyte, ovum, sperm, oogonia, spermatogonia, polar body
Answer» Six Four Two Five Answer :D

Discussion

15898.	Question : How many statements are incorrect for neuron?i. Neurons are excitable cells because their membranes are in a polarised state ii. Different types of ion channels are present on the neural membrane iii. Ion channels are selectively permeable to different ionsiv. When a neuron is not conducting any impulse the axonal membrane is comparatively less permeable to K^(+) and nearly impremeable to Na^(+)v. Resting membrane is impermeable to negatively charged proteins present in the axoplasm. vi. The ionic gradients across the resting membrane are maintained by the active transport of ions by the sodium-potassium pump.vii. In sodium-potassium pump2Na^(+) transported outwards and 3K^(+) into the cell.
Answer» ONE Two Three FOUR ANSWER :B

Discussion

15899.	Question : How many structural genes are located in lac operon of E.Coli?
Answer» 4 3 2 1 Solution :3

Discussion

15900.	Question : How many statements are incorrect among following statements :- (i) LH surge induce rupture of graffian follicle. (ii) At puberty total 60000-80000 primary follicles are left in both ovaries. (iii)Immediately after implantation inner cell mass differentiates into placenta. (iv)Mammary glands differentiates after child birth.
Answer» 1 2 3 4 Solution :Only STATEMENTI iscorrectrestall INCORRECT.

Discussion

Explore topic-wise InterviewSolutions in .

Question : How molecular biology can be used for treatment and detection of cancer?

Question : How modern biotechnology differs from conventional biotechnology ?

Question : How microbial enzymes are produced ? Mention its significance.

Question : How microbes are used in Gobar gas production ?

Question : How may ATP molecules are needed to produce 4 molecules of NH3 during symbiotic N2 fixation by Rhizobium leguminosarum in root Nodule ?

Question : How many zoos are in the world ?

Question : How many years is life spam of a parrot ?

Question : How many years are considered in one minute in Geological clock?

Question : How many years before modern man started?

Question : How many years ago earth was originated ?

Question : How many year does a tortoise live ?

Question : How many X-chromosomes are present in male grasshopper ?

Question : How many XMP are formed in calvin cycle for the production of one glucose molecule

Question : How many words co-relate with accessory excretory organs? Skin, Lungs, Liver, Pancreas, Intestine, Mouth

Question : How many worker bees are there in a good and well-developed colony of bees?

Question : How many wisdom teeth are present in a man?

Question : How many vertebrae are present in a baby ?

Question : How many types of zygotic combinations are possible between a cross AaBBCcDd × AAbbCcDD?

Question : How many variable segments are present in the basic structure of antibody molecules?

Question : How many varieties of rice has been estimated to be present in India ?

Question : How many types of tissue systems are present in plants on the basis of morphology and location according to Van sachs

Question : How many types of spindles are forms during cell division in Eukaryotes :-

Question : How many types of RNA polymerase required for RNA synthesis ?

Question : How many types of gametes are produced from individual of AABBCcDdee genotype

Question : How many types of gametes are produced by heterozygous dihybrid plant with a genotype RrYy ? Write them .

Question : How many types of gametes are produced by a dihybrid plant. If the same plant is self fertilized , how many second generation offspring are developed ?

Question : How many types of gametes are formed by a plant having AaBbCc genotype, in which A & B genes shows complete linkage.

Question : How many types of corolla are there in petals

Question : How many types of gametes are obtained from a plant of genotype TTRr?

Question : How many types of DNA polymerases does an eukaryotic cell possess?

Question : How many types of combinations of gametes are possible in a monohybrid F_(1) parents

Question : How many types of animal breeding methods are there?

Question : How many types of anticodons are present ?

Question : How many type of gametes are produced by a plant having genotypes AaBbCcDd, AABBCCDD, aaBbCcDd and aabbccDd respectively ?

Question : how many turns of Calvin cycle yield one molecule of glucose?

Question : How many times , non steroid pills can be taken as contraceptive ?

Question : How many times / minutesa normal human heart beats ?

Question : How many transgenic varieties of basmati rice are grown in India ?(A) 2,00,000(B) 50000(C) 1000(D) 27

Question : How many times meiotic division will take place to produce 512 pollen grains?

Question : How many time dose a molecule of urea have to pass through the heart in its journey from liver to kidney ?

Question : How many tetrads are visible in human meiocyte?

Question : How many terms in the column is associated to stonewort? Protandrous, Gynandrous, Shield cells, Coronary cells, Tube cells, Archegoniophore, Globule, Monoecious

Question : How many terms are related with kingdom Protista Zygote, Embryo, Cilia, Pili, Pellicle, water bloom, Nitrogen fixation, Photosynthesis, Pseudopodia, tissue, Heterocyst

Question : How many synergid cells are there in an mature embryo sac . Mention any two major role of synergids.

Question : How many substrate level phosphorylation take place in glycolysis

Question : How many structures in the list given below are haploid? Spermatid, secondary oocyte, primary spermatocyte, ovum, sperm, oogonia, spermatogonia, polar body

Question : How many structural genes are located in lac operon of E.Coli?