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6601.

Question : The discovery of virus has placed the problemof the origin of life in new light and it is believed that the higher forms of life have descended from

Answer»

Free-living VIRUSES
Free-living bacteria
Free-living Protozoa
Free-living Metazoa

Answer :A
6602.

Question : The disease chikunguniya is transmitted by

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house FLY
Aedes mosquito
cockroach
female Anopheles

Solution :Dengue and CHIKUNGUNYA are transmitted by ADES mosquitoes.
House fly causes SPREADS TYPHOID.
Cockroach can spread typhoid, dysentery etc.
Female Anopheles is the vector of malaria.
6603.

Question : The direction of the water flow in given cells X, Y & Z can be presented as (##MOT_CON_NEET_BIO_C05_E03_051_Q01.png" width="80%">

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` X to Y leftarrow Z `
` X to Y to Z `
` X leftarrow Y leftarrowZ `
` X leftarrowY to Z `

ANSWER :A
6604.

Question : The discontinuously synthesized fragments of lagging strand are called………………..

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SOLUTION :OKAZAKI FRAGMENTS
6605.

Question : The direction of the transport of auxins is

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POLAR in basipetal
Polar in acropetal
Through xylem
Through phloem

Answer :A
6606.

Question : The direction of the movement of water :

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From low OP to HIGH OP
From low DPD to high DPD
From high DP to low DP
All of the above

Answer :D
6607.

Question : The direction and rate of water movement from cell to cell is based on

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WP
TP
DPD gradient
Incipient plasmolysis

Answer :C
6608.

Question : The dihybrid ratio 9:3:4 comes in case/s of

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Recessive epistasis ratio
supplementary GENE ratio
Both (a) and (B)
DOMINANT epistasis

Answer :C
6609.

Question : The digestive system of a leech includes the long alimentary canal and the __________ .

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SOLUTION :DIGESTIVE GLANDS
6610.

Question : The digestive glands associated with the alimentary canal includes a. Salivary glandsb. Gastric glands c. Liverd. Pancreas e. Brunner's glands

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a, B and E
b, C and d
a, b, c and
a, c and d

ANSWER :D
6611.

Question : The digestion in Amoeba is of___type.

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Extracellular
Intracellular
Both a and B
Holozoic

Answer :B
6612.

Question : The diffusion of water through a semipermeable membrane is known as:

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osmosis
Imbibition
Guttation
Transpiration

Answer :A
6613.

Question : The diffusion of bicarbonate ions from RBC into plasma and of chloride ions from plasma into RBC to maintain ionic balance between RBC and plasma is known as I. Henry's law II. Chloride shift III.Charlc's law IV.Hamburger's phenomenon

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I and II are CORRECT
II , III and IV are correct
II and IV are correct
III and IV are correct

Answer :C
6614.

Question : The differentiation, which continues through all the phases of growth is known as

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structural differentiation
physiological differentiation
GROWTH differentiation
TOTAL differentiation

ANSWER :B
6615.

Question : The different stages of primary succession in water are represented below . Fill the gaps : (a) Phytoplankton (b) .............. (c) Submerged free floating plants(d) .................. (e) .............. (f) Shrub stage (g) ..............

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Solution :(B) Rooted submerged plants (d) Reed swamp stage (E) SEDGE meadow stage (G) FOREST stage (Climax community)
6616.

Question : The different parts of the nephron and kidney, that are involved in urine flow have been given different numbers in the provided key. Using these numbers identify the correct option representing the route of the urine flow after DCT. I. Collecting duct II. Connecting tubule III. Major calyx IV. Minor calys V. Duct of Bellini VI. Renal pelvis VII. Renal papilla VIII. Medullary pyramid IX. Column of Bertin

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`II,II,V,VIII,VII,IV,III,VI`
`I,II,III,V,IV,VI,VIII,IX`
`I,II,III,IV,V,VI,VII,VIII,IX`
`VI,VII,VIII,IX,V,IV,III,II`

Answer :A
6617.

Question : The different forms of interbreeding species that live in different geographical regions are called

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sibling SPECIES
sympatric species
ALLOPATRIC species
polypic species.

Solution :In allopatric speciation, a part of the POPULATION becomes eographically isolated from the MAIN population. The population becomes entirelyseparated and finally consititutes a new species. Formation of Darwin's finches that formed separate species in Galapagos islands in an example of allopatric speciation.
6618.

Question : The differences between mRNA amd tRNA are that mRNA has more elaborated 3-dimensionalstructure due to extensive base -pairing (ii) tRNA has more elaborated 3-dimensional structure due to extensive base -pairing (iii) tRNAis usually smaller than mRNa (iv) mRNA bears anticodon but tRNA has codons.

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(i)and (II)
(ii) and (III)
(i),(ii) and (iii)
(i),(ii),(iii) and (IV)

ANSWER :B
6619.

Question : The difference between spermiogenesis and spermiation is

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In SPERMIOGENESIS SPERMATOZOA are formed, while in sperimation spermatozoa are released from sertoli cells into the CAVITY of seminiferous tubules
In spermiogenesis spermatids are formed, while in spermiation spermatozoa are formed
In spermiogenesis spermatozoa from sertoli cells are released into the cavity of seminiferous tubules, while in spermiation spermatozoa are formed
In spermiogenesis spermatozoa are formed while in spermiation spermatids are formed

Answer :A
6620.

Question : The difference in the partial pressures of carbon dioxide is very less at the alveoli of lungs (about 5 mm Hg). Still higher amount of carbon dioxide can diffuse through the diffusion membrane compared to that of Oxygen. The reason is

Answer»

Difference in the PARTIAL pressures of oxygen is low at the alveoli of lungs when compared to `CO_2`
Solubility of carbon dioxide is 20-25 times higher than that of oxygen.
The alveolar membrane is with a SINGLE LAYER of thin SQUAMOUS epithelium
Thin diffusion membrane is favourable for diffusion of gases

Answer :B
6621.

Question : The difference between maximum and resting cardiac output of a person is called

Answer»

STROKE volume
reserve volume
cardiac reserve
residual volume

Answer :C
6622.

Question : The dicarboxylic acid required for the formation of first Tricarboxylic acid of Krebs cycle

Answer»

a Ketoglutaric ACID
Oxalosuccinic acid
Malic acid
Oxaloacetic acid

ANSWER :D
6623.

Question : The diaphragm , cervical cap and vaults are

Answer»

Disposeble CONTRACEPTIVE DEVICES
Reusable contraceptives
IUDS
Implants

Answer :B
6624.

Question : The diameter of intermediate filament is

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15 nm
6 nm
10 nm
5-7 nm

Answer :C
6625.

Question : The diameter of a solenoid of chromatin is

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`2 nm`
`30 nm`
`700 nm`
`1400 nm`

Answer :B
6626.

Question : The diagrammatic representation shows the operation of natural selection. Give suitable heading for these curves.

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Solution :a. STABILISING curve - More INDIVIDUALS ACQUIRE mean character value.
b. Directional curve - More individuals acquire value other than the mean character value.
c. Disruptive curve - More individuals acquire peripheral character value at both ends of the DISTRIBUTION curve.
6627.

Question : The diagram shows the heart with its main blood vessels Which blood vessels carry oxygenated blood to the body tissues and deoxygenated blood away from the body tissues ?

Answer»


ANSWER :A
6628.

Question : The diagram shows an important concept in the genetic implication of DNA. Fill in the blanks A to C.

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A-transcription, B-replication, C-James WATSON
A-translation, B-transcription, C-Erwin Chargaff
A-transcription, B-translation, C-Francis CRICK
A-translation, B-extension, C-Rosalind Franklin

Solution :A-transcription, B-translation, C-Francis Crick
6629.

Question : The diagram shows an important concept in the genetic implication of DNA. Fill in the blanks A to C. DNAoverset(A)to mRNA overset(B)to Protein underset(C)overset("Proposed by")to Proposed by

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A-transcription B-translation C-Francis CRICK
A-translation B-extension C-Rosalind FRANKLIN
A-transcription B-replication C-James WATSON
A-translation B-transcription C-Erevin Chargaff

Answer :A
6630.

Question : The diagram shows amniocentesis and some parts have been indicated by alphabets. Choose the correct match.

Answer»


ANSWER :A
6631.

Question : The diagram represents an anatropous ovule. Label its parts.

Answer»

SOLUTION :
6632.

Question : The diagram given here shows the skulls of two different mammals. Which of the following accurately describes the differences between these skulls?

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SkullA has more TEETH than skull B.
Skull A has more brain CAPACITY than skull B.
Skull A is of a human and skull B is of an ape.
Skull A is of a ape and skull B is of a human.

SOLUTION :N//A
6633.

Question : The diagram given here shows the skulls of two different mammals. Which of the following accurately describes the differences between these skulls?

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SKULL A has more teeth than skull B
Skull A has more BRAIN capacity than skull B
Skull A is of a HUMAN and skull B is of an ape
Skull A is of an ape and skull B is of human

Answer :D
6634.

Question : The diagram given below shows a segment of double - stranded DNA. Copy it and lable the parts marked a a and b.

Answer»

SOLUTION :
6635.

Question : The diagram given here is the standard ECG of a normal person. The P-wave represents the

Answer»

The BEGINNING of the systole
End of systole
Contraction of both the artia
Initiation of the VENTRICULAR contraction

Answer :A
6636.

Question : The diagram given alongside shows conduction of nerve impulse : (a) Name 'A' and 'B'. (b) Write the function of 'A'.

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Solution :(a) A= Axon cylinder and B = Nodes of Ranvier.
(b) Axon cylinder helps in the TRANSMISSION of the nervous inlpulse. In a polarized state this part is electronegative. When stimulus is applied the membrane becomes FREELY permeable and rapid influx of `Na^(+)` takes place through axon. This CAUSES polarity to change and then depolarization state is achieved. The change of polarity causes potential difference and thus nerve impulse is transmitted through axon cylinder. The conduction of nerve impulse across the nerve fibres mainly takes place DUE to axonal cylinder.
6637.

Question : The diagram given below represents the hydrosere plant succession. Name the stages from A to G

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SOLUTION :A-Phytoplankon stage , B-Submerged plant stage ,C-Submerged FREE FLOATING stage D-Reed SWAMP stage , E - Marsh meadow stage , F - Shrub stage, G-Forest stage
6638.

Question : The diagram depicts

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TRANSCRIPTION
REPLICATION
REVERSE transcription
Translation

ANSWER :B
6639.

Question : The diagram above is that of a typical biogas plant. Explain the sequence of events occurring in abiogas plant. Identify a, b and c.

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Solution :: SLUDGE tank
: GAS holder
Charge kit
The SEQUENCE of events occuring in a BIOGAS PLANT is that theglog:
6640.

Question : The Devonian period is considered to be as

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age of fishes
age of amphibians
age of reptiles
age of mammals.

Solution :Devonian period occurred about 400 MILLION YEARS ago in Paleozoic era. This period was MARKED by albundance of fishes and hence CALLED as age of fishes.
6641.

Question : The device which helps in explaining the concepts easily through _______ is known as Visual Communication device.

Answer»
6642.

Question : The diagnosis of cancer can be performed by using techniques such as

Answer»

Biopsy
MRI
Computed tomography
All of these

Answer :D
6643.

Question : The device used to remove gases like sulphur dioxide for industrial exhaust.

Answer»

SOLUTION :SCRUBBER
6644.

Question :The development of sporophyte from gametophytic tissue without fusion of gametes is

Answer»

APOSPORY
APOGAMY
APOMIXIS
Parthenogenesis

Answer :B
6645.

Question : The development of pollen grains in Angiosperms is calledMicrosporogenesisEmbryogenesisMegasporogenesisGametogenensis

Answer»

MICROSPOROGENESIS
EMBRYOGENESIS
Megasporogenesis
Gametogenensis

Answer :A
6646.

Question : The development of endosperm precedes the development of embryo in angiospermic seed. Why?

Answer»

SOLUTION :PROVIDES NUTRITION to EMBRYO, provides nutrition during seed GERMINATION
6647.

Question : The development of embryo from unfertilized egg is(A) haploid apogamy(B) Parthenogenesis(C) generative apospory(D) somatic apospory

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HAPLOID apogamy
Parthenogenesis
generative apospory
somatic apospory

Answer :B
6648.

Question : The development of biotechnology has made immense impact in the area of health care. Briefly explain any three such developments with examples.

Answer»

Solution :i. Genetically ENGINEERED insulin: First two DNA sequences corresponding to A and B, chains of human insulin and introduced them in plasmids of E.coli to produce insulin chains. Chains A and B were produced separately, extracted and combined by CREATING disulfide bonds to form human insulin.
ii. Gene therapy: Gene therapy is a collection of methods that allows correction of a genę defect. In ADA deficiency treatment, lympho cytes from the blood of the patients are grown in a culture OUTSIDE the body. A functional ADA cDNA is then introduced into these lymphocytes, which are subsequently returned to the patients.
III. Molecular diagnosis: A very low concentration of a bacteria or virus can be detected by amplification of their nucleic acid by PCR. It is now routinely used to detect mutations in genes in suspected cancer patients and to detect HIV in suspected AIDS patients.
6649.

Question : The development of bioreactors is required to produced large quantities of products. (c ) How does a simple stirred tank boreator differ from sparged stirred tank bioreactor?

Answer»

Solution :The stirrer FACILITATES EVEN mixing and oxygen availability throughout simple-stirred tank BIOREACTOR,WHEREAS in case of sparged stirred tank bioreactor,AIR is bubbled throughout the reactor for proper mixing.
6650.

Question : The development of bioreactors is required to produced large quantities of products. (b) Draw a well labelled diagram of simple stirred-tank bioreactor.

Answer»

SOLUTION :(ii) Figure 11.7(a) simple stirred-tank BIOREACTOR PAGE No. 204 NCERT book,Biology-XII