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17901.

Question : Differentiate Intersexes from Supersexes.

Answer»

SOLUTION :
Discussion
17902.

Question : Different types of population intersection has been observed in a population. Write the type of interaction observed among the following species : {:(,"Species A", "Species B","Type of Interaction"),(1,"Orchid ophrys","Bees","________"),(2,"Cattle","Cattle egret","________"),(3,"Sea anemone","Clown fish","________"),(4,"Ticks","Dogs","________"),(5,"Cuscutta","Hedge plant","________"),(6,"Tiger","Deer","________"):}

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ANSWER :(a) Mimicry (B) Commensalism, (C) Commensalism, (d) Parasitism (e) Parasitism, (f) Predation.
Discussion
17903.

Question : Different steps of plant breeding are given. Arrange them in order. a. Selection and testing of superior recombinants b.Collection of variability c. Testing release and commercialization of new cultivars. d. Evaluation and selection of parents. e. Cross hybridizationamong selected parents.

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SOLUTION :a. Collection of variability.
B. Evaluation and selection of PARENTS
c. Crosshybridisation among selected parents.
d. Selection and TESTING of superior recombinants
e. Testing release and commercialisation of new CULTIVARS.
Discussion
17904.

Question : Different species of rhododenron have somatic chromosome numbers of 26, 39, 52,78, 104 and 156. By what means does evolution appear to be taking place in this genus?

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ANEUPLOIDY
Hyperploidy
Euploidy
Autoalloploidy

ANSWER :C
Discussion
17905.

Question : Different species are represented by A, B,C,D,G,P,Q,R and S. Which of the following represents a community?

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(i)
(II)
(III)
NONE of these

Answer :B
Discussion
17906.

Question : Different populations of the same organism present in particular geographical area are called:

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Metapopulation
Demes
LOCAL POPULATION
Both (2) & (3)

Answer :D
Discussion
17907.

Question : Different molecular forms of a gene are called

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Traits
PHENOTYPES
COMPLEMENTARY genes
Alleles

Solution :Adventive embryo formation occurs by apomixis which is a kind of ASEXUAL reproduction.
Adventive embryos produce progenies identical to their PARENTS as there is no GENETIC variations during apomixis
Discussion
17908.

Question : Different life forms, among organisms in relation to environment were given by :

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REITER
Odum
Raunkiers
WARMING

ANSWER :C
Discussion
17909.

Question : Different factors affecting population density are given below. I,B,D and E represent:

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EMIGRATION, IMMIGRATION, NATALITY, MORTALITY
Immigration , natality, mortality, emigration
Immigration, mortality, natality, emigration
Immigration, natality, emigration, mortality

Answer :B
Discussion
17910.

Question : Different contraceptive methods are used to control population explosion. Summarise the natural method and barrier method of contraception.

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Solution :(a) Natural METHODS-
Periodic Abstinence
Withdrawl/Coitus interruptus
Lactational amenorrhoea
ABSENCE of menstruation
(b) Barrier methods
Condoms, DIAPHRAGMS, Cervical cap, Vaults
Discussion
17911.

Question : Different chromosomes number of same human beings ABC and D are given below : 22 pairs of Autosomes 22 pairs of Autosomes + XO 22pairs of Autosomes + 1 Autosome 22pairs of Autosome + XXY. Differentiate between aneuploidy and polyploidy

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SOLUTION :Numerical change of CHROMOSOMES at individual level are called aneuploidy OCCURANCE of more than two genomes (exact multiples) of the BASIC chromosomes NUMBER is called polyploidy.
Discussion
17912.

Question : Different contraceptive methods are given below. Pick out the odd one.

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CU T
Saheli
Multiload 375
Lippes loop

Answer :B
Discussion
17913.

Question : Different chromosomes number of same human beings ABC and D are given below : A) 22 pairs of AutosomesB) 22 pairs of Autosomes + XOC) 22pairs of Autosomes + 1 Autosome D) 22pairs of Autosome + XXY. Identify the person who suffers from Klinefelter's syndrome? Write the symptoms.

Answer»

Solution :D-Ferminised CHARACTER, STERILE MALE, Breast development
Discussion
17914.

Question :Different cells have different sizes. Arrange the following cells in an ascending order of their size. Choose the correct option among the followings (i) Mycoplasma (ii) Ostrich eggs(iii) Human RBC (iv) Bacteria

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i, IV, III & II
i, iii, iv & ii
ii, i, iii & iv
iii, ii, i & iv

Answer :B
Discussion
17915.

Question : Differeniate dichogamy and herkogamy.

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Solution :DICHOGAMY and HERKOGAMY are CONTRIVANCES for CROSS pollination.
Discussion
17916.

Question : Distinguish between primary production and secondary production

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SOLUTION :
Discussion
17917.

Question : Difference between tropical rainforest and temperate forest is

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Tropical forest have more of angiosperms WILD temperate forests have more of gymnosperms
Tropical forest is homogeneous while temperate ONE is heterogeneous
Plants of temperate forests are more mesophytic
Trees of temperate forests are TALLER than those tropical forests

Answer :B
Discussion
17918.

Question : Difference between transverse binary fission and longitudinal binary fission.

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SOLUTION :
Discussion
17919.

Question : Differentiate between the following: a. Binary fision in amoeba and multiple fission in plasmodium. b. Buddingin yeast and budding in Hydra. c. Regeneration in lizard and Planaria

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SOLUTION :BINARYFISSION in amoeba and multiplefissionin Plasmodium

(b) BUDDING in yeast and budding in Hydra

(c ) Regeneration in LIZARD and PLANARIA
Discussion
17920.

Question : Difference between Chlorophyll'a' and 'b' is regarding this carbon atom of 2^(nd)pyrrole ring

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`3^(rd)`
`2^(ND)`
`4^(TH)`
`5^(th)`

ANSWER :A
Discussion
17921.

Question : Difference between chemical potential of water at any point in a system and that of pure water under standard conditions.

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ANSWER :WATER POTENTIAL
Discussion
17922.

Question : Difference between Atria and Ventricles.

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SOLUTION :
Discussion
17923.

Question : Differantiate betweencommensalismand symbiosis.

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Solution :Commensalismis themutual interactionwhichis benefical for onespecieswhilethe other neithergetsbenefit norharmed .Symbiosisis AHAS oftenbeenappliedto thisrelationshipbut symbiosisproperlyrefersto intimateassociation of TWO or more dissimilar ORGANISMS regardlessof benefits and hence INCLUDES mutualismcommensalismand parasitism.
Discussion
17924.

Question : Dicot stems show scondary growth due to

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PRESENCE of CAMBIUM between xylem and phloem
Presence of parenchyma between xylem and phloem
ABSENCE of cambium between xylem and phloem
Absence of parenchyma between xylem and phloem

Answer :A
Discussion
17925.

Question : Did aquatic life forms get fossilised? If, yes where do we come across such fossils ?

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Solution :YES, aquatic life forms get fossilised in the SEDIMENTS of the water bodies. Infact there are more aquatic than terrestrial fossil organisms.
Such fossils of SEA creatures are found in the mountains as opposed to deep sea beds (in sedimentary rocks).
Earlier they were found at the bottom of the ocean which in due COURSE of time, these oceanssediments were PUSHED up to form mountains.
Discussion
17926.

Question : Dicotyledonous seed is similar to monocot seed in presence of

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 SCUTELLUM
Plumule
Coleoptile
 ALEURONE layer

Answer :2
Discussion
17927.

Question : Dicots and monocots are two classes under the divison- angiosperms. Which of the following statements are correct about their seeds? i. The scutenllum is cotyledon in dicots. ii. Generally, dicots have non-endospermic seeds. iii. Coleoptile covers the plumule in monocots. iv. The heart-shaped embryo is seen in monocots.

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i and III
II and iv
ii and iii
iii and iv

Answer :C
Discussion
17928.

Question : Dicondylic skull is found in :-

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MAMMALS, Birds
Fish, Amphibia
Reptiles, Birds
Mammals, Amphibia

Answer :D
Discussion
17929.

Question : Dicot embryo consists of :radicle and plumuleradicle, plumule, cotyledons and sometimes endosperm.radicle and plumule, cotyledons and tegmenradicle and plumule, cotyledons tegmen ,testa

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RADICLE and PLUMULE
radicle, plumule, cotyledonsand SOMETIMES endosperm.
radicle and plumule, COTYLEDONS and tegmen
radicle and plumule, cotyledons tegmentesta

Answer :B
Discussion
17930.

Question : Dichotomous branching is found in

Answer»

fern
Funaria
liverwortts
Marchantia

Solution :(d) Though many liverworts are dichotomously BRANCHED but some of the LEAFY liverworts are not.However,Marchantia is a LIVERWORT is dichotomously branched.
Discussion
17931.

Question : Dicarboxylic acids pathway is seen in

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Leaves of DOLICHOS
Roots of Maize
STEMS of Opuntia
Leaves of SACCHARUM

ANSWER :D
Discussion
17932.

Question : Diatomaceous earth is obtained from

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XANTHOPHYCEAE
Bacillarlophyceae
Chrysophyceae
Rhodophyceae

Answer :B
Discussion
17933.

Question : Diatomaceous earth is formed by the group of irganisms popularly known as

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Producer-decomposer protists
Chief PRODUCERS in the ocean
Jokers of PLANT kingdom
Devoid of proteins

Answer :B
Discussion
17934.

Question : Diaphragms are contraceptive devices used by the females. Choose the correct option from the statements given below. (i) They are introduced into the uterus (ii) They are placed to cover the cervical region (iii) They act as physical barriers for sperm entry (iv) They act as spermicidal agents

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i and ii
i and iii
ii and iii
iii and iv

Solution :Diaphragms, cervical caps and VAULTS are also barriers made of rubber that are inserted into the female reproductive tract to cover the cervix during COITUS. They PREVENT the conception by blocking the ENTRY of sperms through the cervix.
Spermicidal creams, jellies and foams are usually used along with these barrier to increase the CONTRACEPTIVE efficiency.
Discussion
17935.

Question : Diaphragm is present only in__________.

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Pisces
Reptilia
Aves
Mammalia

Answer :D
Discussion
17936.

Question : Diaphragm is a dome shaped partition of cardiac muscle.

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ANSWER :SKELETAL MUSCLE
Discussion
17937.

Question : Diameter and pitch per turn of helix of .A. model of DNA is

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26 Å & 25 Å
20 Å & 34 Å
18 Å & 46 Å
19 Å & 20 Å

Answer :A
Discussion
17938.

Question : Diagrams of some animals are given below. Identify the common characters in them

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PRESENCE of cnidoblasts
Presence of CILIARY COMB plates
Extracellular and INTRACELLULAR digestion
Bioluminescence

Answer :C
Discussion
17939.

Question : Diakinesis is marked by

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FROMATION of chiasmata
Terminalisation of chiasmata
Crossing over
Nuclear MEMBRANE persist

Answer :B
Discussion
17940.

Question : Diagrammative representation of DNA molecule

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SOLUTION :
Discussion
17941.

Question : Diagrammatically represent the experimental steps in cloning and expressing an human gene (say the gene for growth hormone) into a bacterium like E. coli ?

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SOLUTION :
Discussion
17942.

Question : Diagrammatic represntation of mature embryo sac is given. Identify the cells that are involved in fertilization.

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Solution :CENTER CELL ( with two PALAR nuclei ) and egg
Discussion
17943.

Question : Diagrammatic representation to show a perfect pairing and any two wobble pairing.

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Solution :(1) Wobble HYPOTHESIS was proposed by Crick in 1966.
(2) According to this hypothesis, in the codon-anticodon PAIRING the THIRD base may not be COMPLEMENTARY.
(3) This third base is called a wobble base.
(4) The position at which wobble base is present is called wobble position.
(5) Due to wobble base pairing, the codon and anticodon do not match perfectly. In spite of this, the required amino acid is brought perfectly during translation.

(6) Wobble base pairing brings about the economy of t-RNA. Here, amino acid valine is coded by GUU, GUC, GUA and GUG.
Discussion
17944.

Question : Diagrammatic representation of the operation of natural selection two peaks are formed. This condition shows effect of ......(A) Disruptive(B) Directional(C) Stabilizing(D) Distractive

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DISRUPTIVE
Directional
Stabilising
DISTRACTIVE

ANSWER :A
Discussion
17945.

Question : Diagrammatic representation of Photorespiration .

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SOLUTION :
Discussion
17946.

Question : Diagrammatic representation of Miller's experiment is shown. Sequence of substances appearing during the origin of life would have been.

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AMINO ACIDS, AMMONIA,PHOSPHATES, nucleic ACID
Ammonia, amino acids,protein, nucleic acids
Nucleotides, amino acids, nucleic acids, enzymes
Enzymes, amino acids, proteins, nucleic acids

Answer :B
Discussion
17947.

Question : Diagrammatic representation first four stages of primary succession is given below. Correctly identify A, B, C and D:

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A - Phytoplankton, B - REED-swamp stage,C - SUBMERGED PLANT stage, D - Marsh-meadow stage
A - Reed swamp stage, B - Phytoplankton, C - Submerged plant stage, D - Marsh-meadow stage,
A - Reed-swamp stage, B - Marsh-meadow stage, C - Reed-swamp stage, D - Submerged plant stage
A - Marsh-meadow stage, B - Phytoplankton,C -Reed-swamp stage, D - Submerged plant stage

Answer :A
Discussion
17948.

Question : Explain the process of recombinant DNA technology.

Answer»

Solution :DIAGRAMMATICALLY represent recombinant D.N.A technology.

Detailed Answer:
Each restriction endonuclease recognizes a specific palindromic nucleotide sequences in the DNA.
The palindrome in DNA is a SEQUENCE of base pairs that read the same on the two strands in 5...3 direction and in 3. .. 5. direction. e.g.
5..... GAATTC.... 3
3. .... CTTAAG.... 5
Restriction enzymes cut the strand a little away from the centre of the palindrome sites but between the same two bases on the opposite strands. This leaves single stranded overhanging stretches at the ends. They are called sticky ends.
They form H-bonds with their complementary cut counterparts. This STICKINESS facilitates action of the ENZYME DNA ligase.
Discussion
17949.

Question : Diagrammatic representation of 'central dogma' is given below :Observe the diagram carefully and redraw it making appropriate corrections.DNA-translation---​ mRNA-transcription---​ Protein

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SOLUTION :`DNAoverset "TRANSCRIPTION" rarr mRNA overset "Tranlation" rarr "PROTEIN"`
Discussion
17950.

Question : Diagram shows a typical agarose gel showing migration of DNA fragments . a. Which of the bands has the largest and smallest DNA fragments ?b. Howcan you make fragments of DNA for electrophoresis?c.Explain separation of DNA fragments using electrophoresis.d.Point out a methodto visualize the separatedDNA fragments after electrophoresis .

Answer»

Solution :a. .a. is largest and .d. is smallest .
b. USING restriction endonucleases
c. DNA fragments are NEGATIVELY charged molecules, They are forced to MOVE towards anode under an electric field . DNA fragments SEPARATE according to their size .
d. They are VISUALISED only after staining the DNA with a compound known as ethidium bromide followed by exposure UV light
Discussion