24277 + Interview Questions in Biology in Class 12 Page 51 InterviewSolution

2501.	Question : What is a palindrome sequence ?
Answer» Solution :Palindrome is a SEQUENCE of nucleotide in DNA STRANDS at the SITE which reads the same is 5. - 3. DIRECTION and in the 3.-5. direction.

Discussion

2502.	Question : What is paedogenesis?
Answer» SOLUTION :In paedogenetic parthenogenesis (PAEDOGENESIS) the larves produce a NEW generation of larvae by parthenogenesis. It OCCURS in the sporocysts and Redia larvae of liver fluke. It is also seen in the larvae of some insects. e.g. Gall FLY.

Discussion

2503.	Question : What is a keystone species?
Answer» A species which adds up to only a small PROPORTION of the total biomass of a community, yet has a huge impact on the community's organisation and survival. A common species that has plenty of biomass, yet has a FAIRLY low impact on the community's organisation. A RARE species that has MINIMAL impact on the biomass and on other species in the community. A dominant species that constitutes a large proportion of the biomass and ~hjch affects MANY other species Answer :A

Discussion

2504.	Question : What is a Homologous structure? Give an example.
Answer» Solution :The ORGANS with same structural design/similar anatomical structure and developmental origin but differing in their FUNCTIONS are called homologous organs, 1) Forelimb of human being is homologous to forelimbs of whales and bats. 2) Vertebrate heart or brains. 3) Thorn and tendrils BOUGAINVILLIA and cucurbita.

Discussion

2505.	Question : What is a genophore?
Answer» Solution :In PROKARYOTES such as E. coli though they do not have defined nucleus, the DNA is not scattered throughout the cell. DNA (being NEGATIVELY charged) is held with some proteins (that have positive charges) in a region called the NUCLEOID. The DNA as a nucleoid is organized into large loops held by PROTEIN. DNA of prokaryotes is almost circular and lacks chromatin ORGANIZATION, hence temed genophore.

Discussion

2506.	Question : What is a genetic disorder? Mention its types?
Answer» Solution :A genetic disorder is a disease or syndrome that is caused by an ABNORMALITY in an individual DNA. Abnormalities can RANGE from a small mutation in a single GENE to the addition or subtraction of an entire chromosome or even a SET of chromosomes. Genetic disorders are of two types NAMELY. Mendelian disorders and chromosomal disorders.

Discussion

2507.	Question : What is a gene flow?
Answer» SOLUTION :The transfer of GENES between two genetically different POPULATIONS AMONG themselves is called gene flow.

Discussion

2508.	Question :What is a forest? Name the major forest biomes.
Answer» Solution :Forest is a broad term used to describe areas where there are a large NUMBER of trees. The MAJOR forest biomes are the Tropical FORESTS and the TEMPERATE forests

Discussion

2509.	Question : What is a fermentor ?
Answer» Solution :Bioreactor (Fermentor) is a vessel or a container that is designed in such a way that is can PROVIDE an optimum ENVIRONMENT in which MICROORGANISM or their enzymes INTERACT with a shubstrate to produce the REQUIRED product. In the bioreactor , aeration , agitation, temperature and pH are controlled.

Discussion

2510.	Question : What is a false fruit? Cite an example.
Answer» SOLUTION :Fruit is DEVELOPED from parts of flower other than ovary. EG. Apple and STRAWBERRY

Discussion

2511.	Question : What is Dental formula ?
Answer» SOLUTION :(i) Dental formula is the simple method of representing the teeth of a mammal. (ii) The number of each kind of TOOTH in the UPPER and the lower jaws on one side is COUNTED. (iii) In rabbit, the dental formula is `(I 2/1, C 0/0, PM 3/2, M 3/3)`which is WRITTEN as `2033/1022`. Canines are absent.

Discussion

2512.	Question : What is a cybrid?
Answer» SOLUTION :Cybrid is a cytoplasmic hybrid obtained by the fusion of cytoplasm of CELLS of different parental sources, a TERM applied to the fusion of CYTOPLASMS of two different protoplasts.

Discussion

2513.	Question : What is a Clone?
Answer» Solution :A GROUP of plants produced from a SINGLE plant through vegetative or SEXUAL reproduction are CALLED Clones.

Discussion

2514.	Question : What is a climax community?
Answer» Solution :A COMMUNITY that is in near equilibrium with the ENVIRONMENT is called climax community.

Discussion

2515.	Question : What is a carcinogen? Name one chemical carcinogen and its target tissue.
Answer» SOLUTION :CANCER CAUSING AGENT, Vinylchloride-Liver

Discussion

2516.	Question : What is a bulbil ?
Answer» Solution :A BRANCH or OFFSHOOT, detached from PARENTAL plant falls on the SOIL and grows into a new plant. e.g. Agave.

Discussion

2517.	Question : What is a broad spectrum antibiotic ? Name one such antibiotic.
Answer» Solution :A broad spectrum antibiotic is ONE which can INHIBIT the growth of both gram +ve, and gram -ve bacteria. e.g. TETRACYCLINES, Phenicols, FLUOROQUINOLONES, chloramphenicol, etc. THIRD generation and fourth generation antibiotic cephalosporin.

Discussion

2518.	Question : What is abudas seenin yeast ?
Answer» SOLUTION :a smallprojection onthemothercellwhichformsa daughtercell andgetsseparatedfromit .

Discussion

2519.	Question : What is a breed?
Answer» Solution :Breed is a GROUP of ANIMALS having COMMON ancestor. Animals belonging to the same breed show similar characters such as general appearance, features, size, CONFIGURATION, ETC.

Discussion

2520.	Question : What is a bisexual flower? Collect five bisexual flowers from your neighbourhood and with the help of your teacher find out their common and scientific names.
Answer» Solution :Flower with both SEX ORGANS- MALE sex organ (androecium) and female sex organ (GYNOECIUM). Such flowers are KNOWN as bisexual flowers.

Discussion

2521.	Question : What is a bisexual flower ? Collect five bisexual flowers from your neighbourhood and with the help of your teacher find out their common and scientific names.
Answer» Solution :A FLOWER bearing both MALE and female ORGANS (stamens and carpels) is called a BISEXUAL flower. Examples of PLANTS bearing bisexual flowers are.

Discussion

2522.	Question : What is a bisexual flower?
Answer» SOLUTION :A FLOWER in which both the sex organs (ANDROECIUM and gynoecium) are present is called a bisexual flower.

Discussion

2523.	Question : Define biome.
Answer» Solution :BIOMES are large regions of Earth that have similar or common vegetation and climatic conditions. They play a crucial role in sustaining life on Earth. They are defined by their soil, climate, flora and fauna. Biomes have DISTINCT BIOLOGICAL communities that have been formed in response to a SHARED physio-chemical climate.

Discussion

2524.	Question : What is "A" and "B" in given diagram ?
Answer» A = RNA PRIMER B = RNA HELICASE A = RNA Primer B = DNA Helicase A = SINGLE strand Binding Protein B = DNA Helicase A = Lagging strand B = MOVEMENT of Helicase Solution :A = RNA Primer B = DNA Helicase

Discussion

2525.	Question : What is a Benign tumour?
Answer» Solution :TUMOURS that remain LOCALIZED at the spot of ORIGIN and do not spread to DISTINCT sites.

Discussion

2526.	Question : What is 1 : 1: 1: 1 ratio?
Answer» SOLUTION :DIHYBRID TEST CROSS RATIO.

Discussion

2527.	Question : What is 10% law?
Answer» SOLUTION :The NUMBER of trophic levels in the grazing food chain is restricted as the TRANSFER of energy follows 10 per cent LAW - only 10 per cent of the energy is transferred to each trophic level from the lower trophic level.

Discussion

2528.	Question : What interaction is shown by epiphytic plants?
Answer» SOLUTION :COMMENSALISM

Discussion

2529.	Question : What initiatives were taken for reducing vehicular air pollution in Delhi ? Has air quality improved in Delhi ?
Answer» Solution :Delhi ranked fourth among the 41 most polluted CITIES in the world. Delhi leads the country in its levels of air pollution. Air pollution problems in Delhi became so serious that a public interest LITIGATION (PIL) was filed in the Supreme Court of India. Supreme Court has directed government to take, within a specificed time period, appropriate measures INCLUDING switching over the entire fleet of public transport i.e, buses, from diesel to compressed natural gas (CNG). All the buses of Delhi were converted to run on CNG by the end of 2002. CNG burns most efficiently, unlike petrol or diesel. Very little of it is left unburnt. CNG is cheaper than petrol or diesel. CNG can not be siphoned off by thieves and adulterated like petrol or diesel. Phasing out of old VEHICLES. Use of unleaded petrol. Use of low sulphur petrol and diesel. Use of catalytic converters in vehicles. Application of stringent pollution-level norms for vehicles.

Discussion

2530.	Question : What indicates 'a' in figure ?
Answer» CUCURBITA tendrils Leaf of BOUGAINVILLEA THORN of bougainvillea Leaf of cucurbita Solution :Thorn of bougainvillea

Discussion

2531.	Question : What is phagocytosis ?
Answer» ANSWER :ENGULF of SOLIDS by CELL

Discussion

2532.	Question : What happens when Gram positive bacteria are treated with lysozyme ?
Answer» Their plasma MEMBRANE gets dissolved Their GENETIC MATERIAL gets dissolved Their CELL wall gets dissolved Cell can not SURVIVE in high glucose concentration Answer :C

Discussion

2533.	Question : What happens when external pressure greater than atmospheric pressure is applied on pure water
Answer» Water potential turns zero Water potential BECOMES more negative `Psi_(w)` TUMS positive Pure water become impure Answer :C

Discussion

2534.	Question : What happens when a formalin preserved filament of Spirogyra is placed a hypertonic sugar solution?
Answer» It LOOSE turgidity It GAINS turgidity It is plasmolysed NOTHING happens Answer :D

Discussion

2535.	Question : What happens to the following floral parts , after the fertilization process ? (a) Ovary (b) Secondary nucleus (c) Outer integument of ovule (d) Funicle
Answer» SOLUTION :(a) OVARY `RARR` Fruit (b) Secondary nucleus `rarr` Endosperm (c) Outer integument of ovule `rarr` Outer seed coat (TEST) (d) Funicle `rarr` STALK of the seed

Discussion

2536.	Question : What happens to the cells in potato to which surrounded a bore with sucrose solution in it
Answer» FLACCID Turgid Partly turgid Plasmolysed Answer :A

Discussion

2537.	Question : What happens to an individual whenregular dose of drugs/alcohol is abruptly discontinued ? What characteristics, manifest in the individual under such a situation ?
Answer» SOLUTION :When a regular does of drugs/alcohol is abruptly DISCONTINUED it LEADS to anxiety, shakiness, nausea and swating. This is called the withdrawl syndrome the symptoms of which can be severe and LIFE threatening.

Discussion

2538.	Question : What happens in lymphoid organs with respect to immunity?
Answer» SOLUTION : MATURATION, PROLIFERATION

Discussion

2539.	Question : Type A blood should not be injected to a person having B-blood group. Why ?
Answer» Solution :When two DIFFERENT incompatible blood types are mixed, AGGLUTINATION (clumping together) of erythrocytes (RBC) occurs. The basis of these chemical differences is due to the presence of antigens (SURFACE antigens ) on the MEMBRANCE of RBC and EPITHELIAL cells.

Discussion

2540.	Question : What happens if the gene for production of factor VIII and IX becomes recessive?
Answer» Solution :The VIII and IX are clotting factors for the BLOOD. When a person possesses RECESSIVE gene for these factors, his blood does not clot and the thus becomes a patient of haemophilia.

Discussion

2541.	Question : What happens during inosinic pathway?
Answer» Solution :During inosinic PATHWAY. Uric acid is SYNTHESISED from AMMONIA in the LIVER.

Discussion

2542.	Question : What happens during the first stage of sewage treatment plant?
Answer» Aeration is DONE BACTERIAL ACTIVITY is allowed Physical PARTICLES are removed All the above Solution :Physical particles are removed

Discussion

2543.	Question : What happens during fertilisation in humans after many sperms reach close to the ovum?
Answer» Secretions of acrosome helps one SPERM enter CYTOPLASM of OVUM through zona pellucida All spenns except the one nearest to the ovum lose their tails Cells of corona RADIATA trap all the sperms except one Only TWO sperms nearest the ovum penetrate zona pellucida Answer :A

Discussion

2544.	Question : What happen to the O_(2) dissociation curve of Hb if pH is decreased?
Answer» SHIFT to LEFT shift to right remain UNCHANGED will OSCILLATE erratically Answer :B

Discussion

2545.	Question : What happen in plants during vasculariation
Answer» Differenation of procambium, formation of primary PHLOEM followed by formation of primary XYLEM Differenation of procambium followed by the formation of primary phloem and xylem siultaneusly Formation of procambium, primary phloem and xylem simultaneously Differentiation of procambium followed by the formation of SECONDARY xylem Answer :B

Discussion

2546.	Question : What happen if in code 25 no. UAA mutant or transformed in UAA in 50 amino acid polypeptide gene ?
Answer» MAKE 25 amino acid polypeptide 24 amino acid polypeptide 24 and 25 amino acid with two polypeptide Polypeptide with 49 amino acid Solution :24 amino acid polypeptide

Discussion

2547.	Question : What gases are produced in anaerobic sludges digesters ?
Answer» METHANE and `CO_2` only Methane, HYDROGEN SULPHIDE and `CO_2` Methane, hydrogen sulphide and `O_2` Hydrogen sulphide and `CO_2` ANSWER :B

Discussion

2548.	Question : Which gases are produced in anaerobic sludge digester?(A) Methane(B) Hydrogen sulphide(C) Carbon dioxide(D) All of the above
Answer» METHANE and `CO_2`only Methane, HYDROGEN SULPHIDE and `CO_2` Methane, hydrogen sulphide and `O_2` Hydrogen sulphide and `CO_2` SOLUTION :Methane, hydrogen sulphide and `CO_2`

Discussion

2549.	Question : What forms when meiotic division in an ovule takes place?(A) Archesporium Tissue(B) Megaspore Mother cell(C) Megaspore(D) generative cell
Answer» ARCHESPORIUM Tissue Megaspore MOTHER cell Megaspore generative cell Answer :C

Discussion

2550.	Question : What forms the corpus luteum and at what stage? Name two hormones secreted by it.
Answer» Solution :Graafian FOLLICLE, at 14th or 15th day of menstrual cycle, after rupture of mature Graafian follicle and RELEASE of ovum, Progesterone, ESTRADIOL

Discussion

Explore topic-wise InterviewSolutions in .

Question : What is a palindrome sequence ?

Question : What is paedogenesis?

Question : What is a keystone species?

Question : What is a Homologous structure? Give an example.

Question : What is a genophore?

Question : What is a genetic disorder? Mention its types?

Question : What is a gene flow?

Question :What is a forest? Name the major forest biomes.

Question : What is a fermentor ?

Question : What is a false fruit? Cite an example.

Question : What is Dental formula ?

Question : What is a cybrid?

Question : What is a Clone?

Question : What is a climax community?

Question : What is a carcinogen? Name one chemical carcinogen and its target tissue.

Question : What is a bulbil ?

Question : What is a broad spectrum antibiotic ? Name one such antibiotic.

Question : What is abudas seenin yeast ?

Question : What is a breed?

Question : What is a bisexual flower? Collect five bisexual flowers from your neighbourhood and with the help of your teacher find out their common and scientific names.

Question : What is a bisexual flower ? Collect five bisexual flowers from your neighbourhood and with the help of your teacher find out their common and scientific names.

Question : What is a bisexual flower?

Question : Define biome.

Question : What is "A" and "B" in given diagram ?

Question : What is a Benign tumour?

Question : What is 1 : 1: 1: 1 ratio?

Question : What is 10% law?

Question : What interaction is shown by epiphytic plants?

Question : What initiatives were taken for reducing vehicular air pollution in Delhi ? Has air quality improved in Delhi ?

Question : What indicates 'a' in figure ?

Question : What is phagocytosis ?

Question : What happens when Gram positive bacteria are treated with lysozyme ?

Question : What happens when external pressure greater than atmospheric pressure is applied on pure water

Question : What happens when a formalin preserved filament of Spirogyra is placed a hypertonic sugar solution?

Question : What happens to the following floral parts , after the fertilization process ? (a) Ovary (b) Secondary nucleus (c) Outer integument of ovule (d) Funicle

Question : What happens to the cells in potato to which surrounded a bore with sucrose solution in it

Question : What happens to an individual whenregular dose of drugs/alcohol is abruptly discontinued ? What characteristics, manifest in the individual under such a situation ?

Question : What happens in lymphoid organs with respect to immunity?

Question : Type A blood should not be injected to a person having B-blood group. Why ?

Question : What happens if the gene for production of factor VIII and IX becomes recessive?

Question : What happens during inosinic pathway?

Question : What happens during the first stage of sewage treatment plant?

Question : What happens during fertilisation in humans after many sperms reach close to the ovum?

Question : What happen to the O_(2) dissociation curve of Hb if pH is decreased?

Question : What happen in plants during vasculariation

Question : What happen if in code 25 no. UAA mutant or transformed in UAA in 50 amino acid polypeptide gene ?

Question : What gases are produced in anaerobic sludges digesters ?

Question : Which gases are produced in anaerobic sludge digester?(A) Methane(B) Hydrogen sulphide(C) Carbon dioxide(D) All of the above

Question : What forms when meiotic division in an ovule takes place?(A) Archesporium Tissue(B) Megaspore Mother cell(C) Megaspore(D) generative cell

Question : What forms the corpus luteum and at what stage? Name two hormones secreted by it.