24277 + Interview Questions in Biology in Class 12 Page 254 InterviewSolution

12651.	Question : Micro-organisms commonly causing diarrhoeal diseases are
Answer» Esherichia coli, Shigellaspecies , Campylobacter and Bacillus pertussis Clostridium TETANI, Giardia, Entamoeba ESCHERICHIA coli, Giardia, SHIGELLA, Campylobacter and Salmonella Neisseria, Treponema, Escherichia, Giardia , Shigella, Campylobacter and Salmonella. Answer :C

Discussion

12652.	Question : Mice coat colour is an example of
Answer» Complementary genes Duplicate genes RECESSIVE epistasis POLYGENES ANSWER :C

Discussion

12653.	Question : Methylophilus, Spirulina, Mushrooms, Sonalika
Answer» Solution :Sonalika - It is a HIGH yielding and disease resistant wheat VARIETY, all OTHERS are SINGLE cell protein.

Discussion

12654.	Question : Methods of selection in plants showing self pollination is
Answer» CLONAL selection Mass selection Pureline selection Pedigree selection Answer :C

Discussion

12655.	Question : Methods to analyse the result of crosses in genetics ………..
Answer» SOLUTION :CHECKER BOARD METHOD or Forkline method

Discussion

12656.	Question : Method of raising new plants from a small plant tissue with the help of tissue culture technique is referred as
Answer» Layering Grafting Micropropagation Gootee Answer :C

Discussion

12657.	Question : Methanogens grow anaerobically on cellulose material produce large amount of CH_4 along with CO_2 and H_2. This technology of biogas plant was developed in India mainly by:
Answer» IARI KVIC IIT-Khargpur BOTH (A) AND (B) ANSWER :D

Discussion

12658.	Question : Methanogens convert
Answer» METHYL ALCOHOL into methane Formic ACID into methane Acetic acid into methane All the above Answer :D

Discussion

12659.	Question : Methanogens do not produce :
Answer» OXYGEN METHANE HYDROGEN SULFIDE CARBON dioxide Answer :A

Discussion

12660.	Question : Methanogens do not produce(A) Oxygen(B) Methane(C) Hydrogen sulphide(D) Carbon dioxide
Answer» Oxygen Methane Hydrogen SULPHIDE CARBON DIOXIDE Solution :Methanogens are obligate anaerobes, which produce methane, hydrogen sulphide and carbon dioxide but do not produce oxygen

Discussion

12661.	Question : Methanogenic bacteria is used to produce
Answer» Ethane Ethanol METHANE Methanol SOLUTION :Methane

Discussion

12662.	Question :Methanogenic bacteria are not found in
Answer» Rumen of CATTLE Gobar gas plant Bottom of water-logged paddy fields Activated SLUDGE Solution :Methanogenic bacteria are found in rumen of cattle, gobar gas plant and bottom of waterlogged paddy fields. They are not found in the activated sludge. During SECONDARY treatment of waste water, it is in the digester where other kinds of bacteria which grow anaerobically, DIGEST the bacteria and the fungi in the sludge producing mixture of gases such as, methane, HYDROGEN sulphide, and `CO_2`which forms the biogas.

Discussion

12663.	Question :Methanogemc bacteria are not found in :
Answer» RUMEN of cattle gobar GAS plant bottom of WATER - LOGGED PADDY fields activated sludge Answer :D

Discussion

12664.	Question : Methane is ..................... times as effective as CO_2at trapping heat.
Answer» 5 10 20 100 Solution :20

Discussion

12665.	Question : Methane is one of a potent green house gas. Point out few sources from where methane is generated.
Answer» Solution :PADDY field, FOSSIL fuel production, bacteria in water BODIES, cattle REARING, non-wetland soils and FOREST & wild fires

Discussion

12666.	Question : Metastasis is:
Answer» Solution :(1)When the cancerous form tumour and if the tumour is not covered in a mamrane,then the cancerous cells spread to NEARBY parts of the body bynthe process of invasion and angiogenesis.These two process together cause metasrasis.(2)By Metastasis,other healthy cells and tissues are destroyed.(3)In simple terms,it is the spread of cancer throughout the body.(4)Once metastasis occurs,the TREATMENT becomes difficult,symtoms of metastasis depend UPON the location to which the cancerous cells spread.(5)There arfe additional symptoms such as swollen lymph nodes,painful bones,vertigo,HEADACHES,seizures,etc.

Discussion

12667.	Question : Metanephric kidney occurs in
Answer» amniotes fishes amphibians invertebrates Answer :A

Discussion

12668.	Question : Metamorphosis of Tadpole (frog) is accelerated by:
Answer» Insulin Growth hormone Vasopressin Thyroxine Answer :D

Discussion

12669.	Question : Metal ion part of enzyme.
Answer» ANSWER :COFACTOR

Discussion

12670.	Question : Metadisocoidal placenta is found in
Answer» HUMANS COW PIG RABBIT. ANSWER :A

Discussion

12671.	Question : Metabolically active cells, of the adult animal's heart, are remain in which phase ?
Answer» S-PHASE `G_(0)` phase `G_(2)` phase M phase Answer :B

Discussion

12672.	Question : Metabolic energyofthe cell is utilized in______absorption of water.
Answer» ANSWER :ACTIVE

Discussion

12673.	Question : Mesozoic era is known as the age of
Answer» fishes amphibians reptiles molluscs Answer :C

Discussion

12674.	Question : Mesophyll tissue comprising of spongy and pallisade cells is found in leaves of
Answer» Monocot Dicot Gymnosperms All of the above Answer :B

Discussion

12675.	Question : Mesoglea of ctenophores contain
Answer» Colloblast Cnidoblast Amoebocytes Germ cells Answer :C

Discussion

12676.	Question : Mesogamy is :
Answer» FUSION of male and female gametes Fusion of PHYSIOLOGICALLY SIMILAR and morphologically different gametes Entry of pollen tube through integuments None of the above Answer :C

Discussion

12677.	Question : Meselson and stahl experiment proved
Answer» DNA is GENETIC material Central dogma transformation Semi CONSERVATION DNA replication Answer :D

Discussion

12678.	Question :Meselson and Stahl experiment proved
Answer» a] DNA is GENETIC MATERIAL b] central DOGMA c] transformation d] semi conservative DNA replication Answer :D

Discussion

12679.	Question : Mesangial cell convert ammonia into urea.
Answer» true false Answer :LIVER CELL

Discussion

12680.	Question : Mesaginal cells in glomerus regulate:
Answer» WATER pressure Blood pressure Glucose flow Urea flow Answer :B

Discussion

12681.	Question : Meristems formed from primary permanent tissue by rejuvenation are called?
Answer» ANSWER :SECONDARY MERISTEM

Discussion

12682.	Question : Meristem present at Lamina margin is :-
Answer» APICAL meristem Intercalary meristem Mass meristem Marginal meristem Answer :D

Discussion

12683.	Question : ______meristem found in grasses, helps to regenerate the parts removed by gazing herbivores
Answer» lateral apical intercalary both(1)&(2) ANSWER :C

Discussion

12684.	Question : Meristem is :-
Answer» SPECIALISED REGION of ACTIVE CELL division Specialised region of active cell differentiation Specialised region of active cell elongation Specialised region of cell matuation Answer :A

Discussion

12685.	Question : Mercury pollution causes
Answer» BLACK FOOT disease itai-itai disease blue-baby syndrome Minamata disease Answer :D

Discussion

12686.	Question : Mercury pollution causes.
Answer» Black FOOT disease ITAI - itai disease Blue- baby SYNDROME MINAMATA disease Answer :D

Discussion

12687.	Question : Mention the four types of resultantsof dihybrid cross.
Answer» Solution :(i) YELLOW round (YR)-`9//16` (II) Yellow wrinkled (Yr)-`3//16` (iii) Green round (yR)- `3//16` (iv) Green wrinkled (yr)- `1//16`

Discussion

12688.	Question : Mention various steps included in the process of decomposition.
Answer» Solution :The IMPORTANT steps in the PROCESS of decomposition are fragmentations, leaching, catabolism, HUMIFICATION and mineralisation. (i) Fragmentation : DETRITIVORES (e.g., earthworm) breakdown detritus into smaller particles. This process is called fragmentation. Diagrammatic representation of decomposition cycle in a terrestrial ecosystem (ii) Leaching : By the process of leaching, water soluble inorganic nutrients go down into the soil horizon and get precipitated as unavailable salts. (iii) Catabolism : Bacterial and fungal enzymes degrade detritus into simpler inorganic substances. This process is called catabolism. (iv) Humification : Humification and mineralization occur during decomposition in the soil. Humification leads to accumulation of a dark coloured amorphous substance called humus that is highly resistant to microbial action and undergoes decomposition at an extremely slow rate. Being colloidal in nature it serves as a reservoir of nutrients. (v) Mineralization : The humus is further degraded by some microbes and release of inorganic nutrients occur by the process known as mineralization. Decomposition is largely an oxygen requiring process. The rate of decomposition is controlled by chemical composition of detritus and climatic factors. In a particular climatic condition, decomposition rate is SLOWER if detritus is rich in lignin and chitin and quicker, if detritus is rich in nitrogen and water soluble substances like sugars. Temperature and soil moisture are the most important climatic factors that regulate decomposition through their effects on the activities of soil microbes. Warm and moist environment favour decomposition whereas low temperature and anaerobiosis inhibit decomposition resulting in build up of organic materials.

Discussion

12689.	Question : Mention various instances when people participation helps in conservation of forests.
Answer» SOLUTION :The Government of India has recently started the Amrita Devi Bishnoi Wildlife Protection Award for individuals or communities from rural areas that have shown EXTRAORDINARY courage and dedication in protecting wildlife. CHIPKO Movement - In 1974, local women of Garhwal Himalayas SHOWED tremendous courage in protecting trees from the axe of contractors by hugging them. People all over the world have appreciated the Chipko movement. Realising the importance of participation by local communities, the Government of India in 1980S has introduced the concept of Joint Forest Management (JFM) so as to work closely with the local communities for protection.

Discussion

12690.	Question : Mention type of nutrient cycling explaining it.
Answer» Solution :Organisms need a constant supply of nutrients to grow, reproduce and regulate various body functions. The amount of nutrients, such as carbon, nitrogen, phosphorus, calcium, etc., present in the soil at any given time is referred to as the standing state. It VARIES in different kinds of ecosystems and also on a seasonal basis. Nutrients which are never lost from the ecosystem rather they are recycled time and again indefinitely. The movement of nutrients elements through the various components of an ecosystem is called nutrient cycling. ANOTHER name of nutrient cycling is biogeochemical cycles (bio-living organisms, geo, rocks, air, water). Nutrient cycles are of two types: (a) gaseous (b) sedimentary. The reservoir for gaseous type of nutrient cycle. (E.g., nitrogen, carbon cycle) exists in the atmosphere and for the sedimentary cycle. (E.g. sulphur and phosphorus cycle) the reservoir is LOCATED in Earth.s crust. Environmental factors e.g., soil, moisture, pH, temperature etc., regulate the rate of RELEASE nutrients into the atmosphere. The function of the reservoir is to meet with the deficit which OCCURS due to imbalance in the rate of influx and efflux.

Discussion

12691.	Question : Mention two techniques to make Host competent in r-DNA technology.
Answer» SOLUTION :(a) Microinjection (B) BIOLISTICS or gene GUN.

Discussion

12692.	Question : Mention two types of competition
Answer» SOLUTION :INTERSPECIFIC, INTRASPECIFIC

Discussion

12693.	Question : Mention two symptoms of turners syndrome.
Answer» SOLUTION :i) STERILE female with rudimentary ovaries II) Poor development of breasts. iii) LACK of other SECONDARY sexual characters.

Discussion

12694.	Question : Mention two strategies evolved to prevent self-pollination in flowers.
Answer» Solution :FLOWERING PLANTS have developed many DEVICES to discourage self pollination and to encourage CROSS pollination.

Discussion

12695.	Question : Mention two strategies evolved to prevent self -pollination in flowers .
Answer» Solution :(i) DICHOGAMY : Maturation of anther and stigma of a flower at DIFFERENT times . Therefore self pollination is not possible in bisexual flowers . (ii) Dicliny : (unisexually ) . The stamens and carpels occur in different flowers . Self sterility : The pollen GRAINS of a bisexual flower are not able to develop its growth on the stigma of the same flower .

Discussion

12696.	Question : Mention two objectives of-setting up GEAC by our Government.
Answer» Solution :The TWO OBJECTIVES are : 1. To make decisions REGARDING the VALIDITY of GM-research. 2. To decide regarding the safety of INTRODUCING GM-organisms for public services.

Discussion

12697.	Question : Mention two inherent characteristics of Amoeba and yeast that enable them to reproduce asexually.
Answer» Solution :(a) They are UNICELLULAR organisms. (b) They have a very SIMPLE body STRUCTURE.

Discussion

12698.	Question : Mention two functions of the codon AUG.
Answer» Solution :AUG has dual FUNCTION, it codes for METHIONINE (MET.) and it acts as INITIATOR codon.

Discussion

12699.	Question : Mention two factors by which productivity is limited in an aquatic ecosystem.
Answer» Solution :(a) Light - DECREASES with increasing water depth. (B) Nutrient - LIMITING factor in Deep OCEAN.

Discussion

12700.	Question : Mention two classes of nucleases. Suggest their respective roles.
Answer» SOLUTION :

Discussion

Explore topic-wise InterviewSolutions in .

Question : Micro-organisms commonly causing diarrhoeal diseases are

Question : Mice coat colour is an example of

Question : Methylophilus, Spirulina, Mushrooms, Sonalika

Question : Methods of selection in plants showing self pollination is

Question : Methods to analyse the result of crosses in genetics ………..

Question : Method of raising new plants from a small plant tissue with the help of tissue culture technique is referred as

Question : Methanogens grow anaerobically on cellulose material produce large amount of CH_4 along with CO_2 and H_2. This technology of biogas plant was developed in India mainly by:

Question : Methanogens convert

Question : Methanogens do not produce :

Question : Methanogens do not produce(A) Oxygen(B) Methane(C) Hydrogen sulphide(D) Carbon dioxide

Question : Methanogenic bacteria is used to produce

Question :Methanogenic bacteria are not found in

Question :Methanogemc bacteria are not found in :

Question : Methane is ..................... times as effective as CO_2at trapping heat.

Question : Methane is one of a potent green house gas. Point out few sources from where methane is generated.

Question : Metastasis is:

Question : Metanephric kidney occurs in

Question : Metamorphosis of Tadpole (frog) is accelerated by:

Question : Metal ion part of enzyme.

Question : Metadisocoidal placenta is found in

Question : Metabolically active cells, of the adult animal's heart, are remain in which phase ?

Question : Metabolic energyofthe cell is utilized in______absorption of water.

Question : Mesozoic era is known as the age of

Question : Mesophyll tissue comprising of spongy and pallisade cells is found in leaves of

Question : Mesoglea of ctenophores contain

Question : Mesogamy is :

Question : Meselson and stahl experiment proved

Question :Meselson and Stahl experiment proved

Question : Mesangial cell convert ammonia into urea.

Question : Mesaginal cells in glomerus regulate:

Question : Meristems formed from primary permanent tissue by rejuvenation are called?

Question : Meristem present at Lamina margin is :-

Question : ______meristem found in grasses, helps to regenerate the parts removed by gazing herbivores

Question : Meristem is :-

Question : Mercury pollution causes

Question : Mercury pollution causes.

Question : Mention the four types of resultantsof dihybrid cross.

Question : Mention various steps included in the process of decomposition.

Question : Mention various instances when people participation helps in conservation of forests.

Question : Mention type of nutrient cycling explaining it.

Question : Mention two techniques to make Host competent in r-DNA technology.

Question : Mention two types of competition

Question : Mention two symptoms of turners syndrome.

Question : Mention two strategies evolved to prevent self-pollination in flowers.

Question : Mention two strategies evolved to prevent self -pollination in flowers .

Question : Mention two objectives of-setting up GEAC by our Government.

Question : Mention two inherent characteristics of Amoeba and yeast that enable them to reproduce asexually.

Question : Mention two functions of the codon AUG.

Question : Mention two factors by which productivity is limited in an aquatic ecosystem.

Question : Mention two classes of nucleases. Suggest their respective roles.