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17601.

Question : DNA and RNA are similar with respect to

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(a) Thymine as a nitrogen base
(B) A single-stranded helix shape
(C) NUCLEOTIDE containing sugars, nitrogen bases and phosphates
(d) The same sequence of NUCLEOTIDES for the amino acid PHENYL alanine

Solution :Nucleotide containing sugars, nitrogen bases and phosphates
Discussion
17602.

Question : DNA acts as genetic material for majority of living organisms and not the RNA. Give reasons to support the statement.

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Solution :a) RNA was REACTIVE and hence highly unstable.
b) Some RNAmolecules acts as gene regulators by BINDING to DNA and affect gene expression.
C) Uracil ofRNA is LESS stable than thymine of DNA.
Discussion
17603.

Question : DNA absorb lambda_("max")

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600 Å (260 NM)
7600 Å (760 nm)
3900 Å (390 nm)
3000 Å (300 nm)

ANSWER :A
Discussion
17604.

Question : (dN)/(dt)=rN((K-N)/(K)) in above equation ((K-N)/(K)) represent:-

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CARRYING capacity
Environmental resistance
RATE of CHANGE in POPULATION density
Intrinsic rate of growth

Answer :B
Discussion
17605.

Question : dn/dt=(b-d)* N Let (b-d)=r,then dN/dt=rNWhich parameter is choosen for assessing impact of any biotic or abiotic factor on population growth?

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SOLUTION :R PARAMETER
Discussion
17606.

Question : dn/dt=(b-d)* N Let (b-d)=r,then dN/dt=rN what does r indicates in the above equation?

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SOLUTION :INTRINSIC RATE of NATURAL INCREASE
Discussion
17607.

Question : (dN)/(dt) = rN (1- (N)/(K)) What does the following notations represent ? (i) dN/ dt (ii) r (iii) N (iv) K

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SOLUTION : (i) Rate of change in population SIZE (ii) INTRINSIC rate of natural increase (III) Population size (IV) Carrying capacity
Discussion
17608.

Question : (dN)/(dt) =rN How does the increase and decrease in the value of 'r' affect the population size.

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Solution : Increase in the value of .R. will increase RATE of CHANGE in population size. When .r. DECREASES, the reverse happens.
Discussion
17609.

Question : (dN)/(dt) rN equation is applicable to …………..population growth.

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EXPONENTIAL
LOGISTIC
Both (a) and (b)
Not RELATED to population

ANSWER :A
Discussion
17610.

Question :Dixon and Jolly are associated with

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light reaction and photosynthesis
An AEROBIC respiration
Cohesion and transpiration PULL theory of ascent of sap
APICAL dominance

Answer :C
Discussion
17611.

Question : Division in which the egg divides completely is known as

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HOLOBLASTIC
Meroblastic
Macroblastic
Blastogenic.

ANSWER :A
Discussion
17612.

Question : Divergent Evolution and Convergent Evolution

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SOLUTION :
Discussion
17613.

Question :diversity The global species diversity of insects is about ____________

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102500
1025000
1250
125

Answer :B
Discussion
17614.

Question : Divergent evolution

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Solution :It is said to OCCUR when one structure or species DEVELOPS along different directions DUE to ADAPTATIONS to different NEEDS.
Discussion
17615.

Question : Diurnal and seasonal variations in the intensity and photoperiod of light are cues for

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Foraging for ANIMALS
REPRODUCTIVE and migratory activities in some animals
FLOWERING in plants
AIl

Answer :D
Discussion
17616.

Question : Distingusih between hydrarch and xerarch succession ?

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SOLUTION :Hydrach succession : TAKES PLACE in water AREAAND the successionalseriesprogressfrom HYDRIC to themesic conditions .
Xerarch succession : Takeplacein dryareas and the
Discussion
17617.

Question : Distinsuish between : (a) Grazzing food chain detritus food chain (b) Production and decomposition.

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Solution :(a) Grazing FOOD chain : *in this food chain energy is derived from the sun.
* It began with producers present at the first trophic level. The plant biomass is then eatenby herbivoes , which in the true are comsumed by a variety of carnivores.
* The food chain is usually large.
detritus food chain:
* In this food chain, energy comes form organic matter ( or detritus ) generated in trophic levels of the grazing food chain .
* It beings with detritus such as dead bodies of animals of fallen leaves which are then EATEN by decomposers pr detritivores . These detritivaroes are in turn consumed by the predators.
* It is usually smaller as compared to the grazing food chain .
(b) Production:
* It is the rate of producing organic matter (food) by producers.
*It depends on the photosynthetic CAPACITY of the producers.
* Sunlight is required by the plants for primary production.
Decompositon:
* It is the PROCESS of breaking down of complex organic matter or biomass from the body of dead plants and animals with the help of decomposers into organic raw MATERIAL such as `CH_(2)`,`H_(2)O,` and other nutrietns.
* It occurs with the help of decomposers.
*Sunlight is not required for decomposition by decomposers.
Discussion
17618.

Question : Distinguish tenuinucellate and crassinucellate ovules.

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SOLUTION :
Note: These TWO types of OVULES are DIFFERENTIATED based on the position of the sporogenous cell.
Discussion
17619.

Question : Distinguish mound layering and air layering.

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SOLUTION :
Discussion
17620.

Question : Distinguish habitat and niche.

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SOLUTION :
Discussion
17621.

Question : In Scratch which blocks are pink?

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Motion
Control
Sound
Look

Answer :C
Discussion
17622.

Question : Distinguish between: Upright and inverted pyramid

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SOLUTION :
Discussion
17623.

Question : Distinguish between transcription and reverse transcription.

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SOLUTION :Synthesis of RNA from DNA is transcription while the transcription OFDNA from RNA is CALLED reverse transcription
Discussion
17624.

Question : Distinguish between the template and coding strands of DNA.

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SOLUTION :
Discussion
17625.

Question : Distinguish between therolesofflocks andanaerobic sludge digesters insewage treatments.

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Solution :FLOCKS :
1.these are massesof bacteria associated with fungal filaments toform a MESH.
2.thesehelptoreducethe Bioogical oxygenDemand(BOD)of theprimary effiuent.
Anaerobic sludgedigesters
1. Herethe activatedsludgeconsistingof bacteria FUNGI is digestedbyanaerbic bacteria .
2. these help in theproducationofbiogas consistingof methane, hydrogensulphide andcarbon dixide .
Discussion
17626.

Question : Distinguish between the following : (Give at least one point of distinction for each pair.) (c) Agricultural water pollution and Shipping water pollution.

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SOLUTION :
Discussion
17627.

Question : Distinguish between the following: Hibernation and aestivation

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SOLUTION :
Discussion
17628.

Question : Distinguish between the following: Ecototherms and Endotherms.

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SOLUTION :
Discussion
17629.

Question : Distinguish between the following: (a) Hibernation and Aestivation (b) Ectotherms and Endotherms

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Solution :• (a) Hibernation and Aestivation : Hibernation is the stage of dormancy in WINTER, while aestivation is the stage of dormancy in summer. MANY animals USE this technique to tide over unfavourable environmental conditions.
• (b) Ectotherms and Endotherms : Ectotherms are cold blooded animals with body temperature MATCHING the environmental temperature, while endotherms are warm-blooded animals which can regulate their body temperature by physiological means and maintain more or less CONSTANT internal temperature.
Discussion
17630.

Question : Distinguish betweenthe following . a. Hibermation andAestivation b. Ectotherms and Endotherms

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SOLUTION :The phememonof spendingcoldperiodin an INACTIVE STAGE byanimaliscalledhibernation .
Ectothermsare the coldblooded animalshavingbodytemperature.Theyare affectedbytempeeraturevariations.
Discussion
17631.

Question : Distinguish between structural gene, regulatory gene and operator gene.

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Solution :Structure of the operon: Each operon is a unit of gene expression and REGULATION and consists of one or more structural genes and an adjacent operator gene that controls transcriptional activity of the structural gene.
i) The structural gene CODES for proteins, rRNA and tRNA required by the cell1.
II) Promoters are the signal sequences in DNA that initiate RNA synthesis. RNA polymerase binds to the promoter prior to the initiation of transcription.
ii) The operators are present between the promoters and structural genes. The repressorm protein binds to the operator region of the operon.
Discussion
17632.

Question :Distinguish between structural gene, regulatory gene and operator gene.

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SOLUTION :Structure of the operon: Each operon is a unit of gene expression and regulation and consists of one or more structural genes and an adjacent operator gene that controls transcriptional activity of the structural gene.
i. The structural gene codes for proteins, rRNA and tRNA required by the cell.
ii. PROMOTERS are the signal sequences in DNA that initiate RNA synthesis. RNA polymerase binds to the promoter prior to the INITIATION of transcription.
iii. The operators are present between the promoters and structural genes. The REPRESSOR protein binds to the operator region of the operon.
Discussion
17633.

Question : Distinguish between standing crop and standing state.

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Solution :Standing crop : Each trophic level has a certain MASS of living material at a particular TIME. This is called standing crop.
Standing state :The amount of NUTRIENTS such as carbon, nitrogen,PHOSPHORUS, calcium etc. present in the soil at any given time is called as standing state.
Discussion
17634.

Question : Distinguish between recombinant DNA and recombinant protein.

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Solution :RECOMBINANT DNA - is a genetically modified DNA fragment that is FORMED by rejoining DNA SEQUENCES from two or more different organisms .
Recombinant protein - If any protein ENCODING gene is expressed in a HETEROLOGOUS host, it is called recombinant protein .
Discussion
17635.

Question : Distinguish between: Production and decomposition

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SOLUTION :
Discussion
17636.

Question : Distinguish between primary productivity and secondary productivity of an ecosystem.

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SOLUTION :
Discussion
17637.

Question : Distinguish between: Primary and secondary productivity

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SOLUTION :
Discussion
17638.

Question : Distinguish between Primary and secondary productivity

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SOLUTION :PRIMARY PRODUCTIVITY and SECONDARY productivity.
Discussion
17639.

Question : Distinguish between menstrual cycle and oestrus cycle.

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Solution :Cyclic CHANGES during reproduction in primates is menstrual CYCLE Humans and APES. A cyclic change in NONPRIMATES is oestrus cycle, Cats, dogs ETC.
Discussion
17640.

Question : Distinguish between: Litter and detritus

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SOLUTION :
Discussion
17641.

Question : Distinguish between Litter and detritus

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Solution :DETRITUS is a BIOTIC waste while waste is generally useless substances or OBJECTS. Detritus is decomposed by decomposers or SAPROTROPHS.
While waste is not decomposed by decomposers.
Discussion
17642.

Question : Distinguish between In-situ conservation and Ex-situ conservation

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SOLUTION :
Discussion
17643.

Question : Distinguish between homozygous and heterozygous plants.

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SOLUTION :
Discussion
17644.

Question : Distinguish homogametes and heterogametes.

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SOLUTION :
Discussion
17645.

Question : Distinguish between homogametes and heterogametes.

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SOLUTION :
Discussion
17646.

Question : Distinguish between heterogametic and homogametic sex determination systems?

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SOLUTION :
Discussion
17647.

Question : Distinguish between heterochromatin and euchromatin. Which of the two is transcriptionally active ?

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Solution :EUCHROMATIN : (i) Loosely PACKED (ii) Stains light (iii) Transcriptionally active
Heterochromatin (i) DENSELY Packed (ii) Stains DARK (iii) Transcriptionally inactive
Discussion
17648.

Question : Distinguish between: Grazing food chain and detritus food chain

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SOLUTION :
Discussion
17649.

Question : Distinguish between gametogenesis and embryogenesis.

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SOLUTION :
Discussion
17650.

Question : Distinguish between: Food chain and food web

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SOLUTION :
Discussion