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7501.

Question : Study the pedigree charge given below What does it show?

Answer»

INHERITANCE of asex linked inborn error of metabolism like phenylketonuria
inheritance ofa CONDITION like phenyl-ketonuria as an autosomal recessive trait
The PEDIGREE chart is wrong as this is not possible
Inheritance of a recessive SEX linked DISEASE like haemophilia

Answer :B
7502.

Question : Study the graph given below. Explain how is oxygen concentration affected in the river when sewage is discharged into it.

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Solution :Whensewage is discharged into river, the oxygen concentration declines SHARPLY because a large amount of oxygen is consumed by AEROBIC micro organisms in river to DECOMPOSE the organic matter in river. When the amount of organic matter REDUCES, the amount of dissolved oxygen again increases.
7503.

Question : Study the given statements carefully and give the answer :- (A) In lower taxa similarities are more (B) Families are characterised on the basis of both vegetative and reproductive features of plants species. (C) Felidae and canidae are the families of cat and dog respectively (D) To detemine relations in lower taxa is more difficult in comparison to higher taxa. How many statements are correct from them ?

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ONE
TWO
THREE
FOUR

ANSWER :C
7504.

Question : Study the given populations and choose the correct answer in relation to species diversity.

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`{:("MAXIMUM diversity",,"MINIMUM diversity"),("POPULATION B",,"Population C"):}`
`{:("Maximum diversity",,"Minimum diversity"),("Population A",,"Population C"):}`
`{:("Maximum diversity",,"Minimum diversity"),("Population A",,"Population B"):}`
`{:("Maximum diversity",,"Minimum diversity"),("Population B",,"Population A"):}`

ANSWER :B
7505.

Question : study the given statement and answer the question."During 'P' phase of the mentrual cycle, if pregnancy does't happen, the 'Q' withers and dies usually around day 22 in a 28-day cycle . The drop in 'R' levels cause the lining of the utrerus to fall away. This is know as 's'.Identify P, Q, R and S.

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(1) P `to` Menstrual, Q `to` Graafian follicle, R `to` Estrogen, S `to` Menarche
(2) P `to` luteal, Q `to` CORPUS lutenm, R `to` Progesterone , S `to` menstruation
(3) P `to` OVULATORY, Q `to` Endometrium, R `to` Follicle stimulating hormone, S `to` Menopause
(4) P `to` FOLLICULAR, Q `to` secondary oocyte, R `to` Luteinizing hormone, S `to` Menstruation

Answer :B
7506.

Question : Study the given pedigree chart of a certain family and select the correct conclusion which can be drawn for the character

Answer»

The female PARENT is heterozygous
The PARENTS could not have had a normal DAUGHTER for this character
The TRAIT under study could not be colourblindness
The male parent is HOMOZYGOUS dominant

Answer :A
7507.

Question : Study the given pedigree chart and answer the questions that follow: Is the trait recessive or dominant?

Answer»

SOLUTION :RECESSIVE
7508.

Question : Study the given pedigree chart and answer the questions that follow. Is the trait recessive or dominant? Is the trait sex linked or autosomal? Give the genotypes of the parents shown in generation I and their III child shown in generation II and the first grandchild shown in generation III.

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SOLUTION :Dominant
AUTOSOMAL
PARENTS - Mother-AA
Father - Aa
THIRD child - Aa
First grand-child - Aa
7509.

Question : Study the given pedigree chart and answer the given questions :-

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Is the trait SEX linked or AUTOSOMAL ? Why?
Give the genotype of PARENTS shown in generation–I

Solution : (1) – Autosomal, (2) Mother - AA or aa, FATHER - aa or Aa
7510.

Question : Study the given pedigree chart and answer the queation that follow. (a) In the trait recessive or dominant ? (b) Is the trait sex-linked or autosomal ? (c) Give the genotypes of the parants in generation I and of their third and fourth child in generation.

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Solution :(a) the TRAIT is recessive.
(b) the trait is Autosomal recessive trait.
(c) This is an autosome linked recessive trait that can be transmitted fromparents to the of offspring when both the partners are carrier for the gene (or heterozygous).
The disease is CONTROLLED by a single pair of allele, `Hb^(A) and Hb^(S)` .Out of the three possible genotypes only homozygous individuals for `Hb^(S) (Hb^(S) Hb^(S))` show the DISEASED phenotype Heterozygous (Hb Hbs) individuals appear unaffected but they are carrier of the disease as there is 50% probability of transmission of the mutant gene to the progeny.
GenotypeI GENERATION - Aa and Aa
Genotype of generation II of third child is aa and fourth child is Aa.
7511.

Question : Study the given pedigree chart and answer the questions that follow. Is the trait recessive or dominant? Is the trait sex linked or autosomal? Give the genotypes of the parents in generation I and their third and fourth child in generation II.

Answer»

Solution :If we take A and a as the TRAITS
Recessive
AUTOSOMAL
PARENTS - AA and Aa
Third CHILD - aa
Fourth child - Aa
7512.

Question : Study the given pedigree chart and answer the given questions :-

Answer»

Is the trait recessive or dominant
Is the trait sex linked or autosomal
Give the GENOTYPE of the parents in generation–I and of their THIRD and FOURTH child in generation–II.

Solution :(1) – Recessive, (2) – Autosomal, (3) – Parents in Generation-I – Aa, Aa, 3rd & 4th Children in Generation-II – aa, Aa
7513.

Question :Study the given monohybrid cross: A test cross for this F, will be:

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`T t XX T T`
`T t xx t t`
`T t xx T t`
`T T xx t t`

ANSWER :B
7514.

Question : Study the given fugure that depicts a stem modification and identify the missink links A,B C and D by selecting the correct option

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internodesucker tap rootgreen leaf
NODE runnerfibroius advetntius SCALE leaf
spiners RUNNER tap rootgren leaf
nodestolen adventitious roots internode

ANSWER :B
7515.

Question : Study the given figure of water movement in the leaf and mark the correct series of pressure gradient that occurs during transpiration. (I) Pressure gradient between the outside air and th air spaces of the leaf. (II) Pressure gradient between photosynthetic cells and on the water filled xylem in the leaf vein.

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ANSWER :I`to`II
7516.

Question : Study the given figure carefully and select the true and false statement(s) in this demonstration. (a) Numerically this external pressure in figure (b) is equivalent to the osmotic potential of a solution, but the sign is opposite. (b) Osmotic pressure is due to the solute concentration.

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ANSWER :(a) TRUE
(B) True
7517.

Question : Study the given figure carefully and select the incorrect statements regarding this. (i) It represents a typical agarose gel electrophoresis in which lane 1 contains undigested DNA (ii) Smallest DNA bands are formed at A and largest DNA bands are formed at B (iii) The separated DNA fragments can be visualized after staining in the visible light (iv) The separated DNA bands are cut out from the agarose gel and extracted from the gel piece. this step is known as elution.

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(i) and (ii)
(ii) and (iii)
(ii) and (iv)
Person can see the bands without staining.

Solution :The DNA FRAGMENTS separate according to their size through the agarose gel, with smaller fragments moving farther AWAY as COMPARED to larger ones. The DNA fragments can be VISUALISED by staning them will ethidium bromide followed by exposure to UV radiations.
7518.

Question : Study the given figure and choose the correct option -

Answer»

2.`to` PARATHORMONE
6.`to` ISLETS of langerhans
8.`to` ICSH production
3.`to` Thyroxine
5.`to` Adrenaline
1. `to` FSH production 8.`to` Testosterone
4.`to` Immunity
1.`to` Master GLAND
8.`to` ICSH production 6.`to` Thyroxine
5.`to` Adrenaline
7.`to` LH production
8.`to` Testosterone
6.`to` Insulin
4.`to` Thyroxine

Answer :B
7519.

Question : Study the given diagram and give answer of questions a,b and c. (a) Name of plant ? (b) Clas of plant ? (c) Ploidy of rhizoids ?

Answer»

`{:((a),(B),(c),),("sphagnum","LYCOPSIDA","Haploid",):}`
`{:((a),(b),(c),),("Funaria","Moss","Haploid",):}`
`{:((a),(b),(c),),("Funaria","Liverwort","Diploid",):}`
`{:((a),(b),(c),),("MARCHANTIA","Moss","Haploid",):}`

ANSWER :B
7520.

Question : Study the given aquatic food chain and answer the questions that follow: (i) Give reasons why there is a continuous increase in the DDT content in different trophic levels of the chain. (ii) Name the phenomenon responsible for the increase in DDT content.

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Solution :(i) When DDT ENTERS the FOOD chain it reaches water. Since, it not degradable it gets accumulated progressively at each TROPHIC level.
AB it reaches higher trophic levels, the concentration of DDT also increases.
(ii) BIOLOGICAL magnification.
7521.

Question : Study the given chart and select the correct option w.r.t. genetic disorders.

Answer»

AUTOSOMAL recessive
Autosomal dominant
Allosomal dominant
Holandric gene

Answer :A
7522.

Question : Study the four statements given below and answer the question which follow them. I) Inbreedingis necessary if we wantto develop a pureline in animals II) inbreedingexposes harmful recessive genes that are eliminated by selection III) continuous inbreeding usually reduces fertility and productivity IV) inbreeding depression can be overcome by outcrossingHow many of the above statements are correct?

Answer»

Two
Three
Four
One

Answer :C
7523.

Question : Study the given algae and asnwer the following questions :- (a) Name of alage ? (b) Tpe of sexual reproduction ? (c) Name of division ? (d) Stored food ?

Answer»

Laminaria : Isogamous : Chlorophyta : STARCH
Volvox : OOGAMOUS : Chlorophyta : Starch
Fucus : Isogamous : Rhodophyta : FLORIDIAN starch
Chara : Oogamous : Rhodophyta : Glycogen

Answer :B
7524.

Question : Study the four statements given below and select the two correct ones out of them. (i)A lion eating a deer and a sparrow feeding on grain ar ecologically similar in being consumers. (ii) Predator star fish Pisaster helps in maintainting species diversity of some invertebrates . (iii) Predators ultimately lead to the extinction of praey species. (iv) Production of chemicals such as nicotine, strychnine by the palnts are metablic disorders.

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

ANSWER :D
7525.

Question : Study the following table showing the components of water potential in closely arrange mesophyll cells namely A, B and C {:("Cell","Osmotic Potential (MPa)","Pressure Potential (MPa)"),(A,-0.21,0.05),(B,-0.22,0.02),(C,-0.23,0.05):} Identify two of the following , which show the correct direction of water movement between two cells . I. ArarrB. IIBrarrC III.CrarrA.IVCrarrB

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I ,II
II, III
I ,IV
II,IV

Answer :C
7526.

Question : Study the following table carefully and choose the incorrectly matched option -

Answer»


ANSWER :D
7527.

Question : Study the following table and choose the option that correctly identifies A, B, C and D. ,

Answer»


ANSWER :A
7528.

Question : study the following table and find the correct pair

Answer»

false whorl-like inflorescence - many sessible BISEXUAL folowers-leonotis
single flower-like inflorescence, -many STALKED staminate and pistillate folwers- poinsettia
fruit-like inflorescence-many sessile,staminate flowers on TOP,pistillate flowers at base and sterile flowers in between-ficus
fleshy AXIS of inforescence-many stalked, staminate flowers at base , pistillate flowers on top and sterile flowers in between -colocasia.

Answer :c
7529.

Question : Study the following step which are followed during the process of gene therapy while treating a patient of SCID (i) Retrovirus infects lymphocytes extracted from bone marrow of the patient and cultured (ii) Engineered cells are injected into patient's bone marrow (iii) Normal allele is inserted into a retrovirus (iv) Retrovirus makes a DNA copy of its RNA. This DNA carrying the normal allele gets inserted into the chromosome of the host cell Arrangement the above given steps in correct sequence and select the correct option

Answer»

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

ANSWER :B
7530.

Question : Study the following statements with respect to human cardiovascular system and choose the correct one.

Answer»

All the openings that ALLOW the flow of deoxygenated blood into right atrium are GUARDED by valves whereas the openings of pulmonary veins have no valves
'AVN' is seen in the LOWER right corner of the right atrium postero inferior region of the inter atrial septum
The semilunar valves of aortic arches are CLOSED during ventricular filling.
Tricuspid and bicuspid valves are inter connected by chordae tendineae

Answer :C
7531.

Question : Study the followingstatements regarding Bt toxins produced bybacteriumBacillus thuringiensis andselect the correct one

Answer»

Most strains of Bacilus thuringiensis produceproteins that kill certain insects such as LEPIDOPTERANS, coleopterans and dipterans
Bt toxin proteins do not kill the bacteria themselves because the toxin proteins occur in an inactive from called protoxins
When an insect ingests the inactive Bt toxin, it is converted to an active form of toxin due to alkaline pH of THEGUT which solubilises the protein crystals
all of these

Solution :Soil bacterium, Bacillus thruingiensis (Bt) PRODUCES proteins that kill certain insects like lepidopterans (tabacco budworm,armyworm), coleopterans (beetles) and dipterans (flies, mosquitoes). Bacillus thuringiensis forms some intracellular protein crystals. These crystals contain some intracelluar protein. The Bt toxin protein exists as inactive toxin and is converted into an active form due to the alkaline pH of the ALIMENTARY canal that solubilises the crystals. The ACTIVATED toxin binds to the surface of midgut epithelial cells and create pores which cause cell swelling and lysis and finally cause death of the insect.
7532.

Question : Study the following statements and select the incorrect ones. (i) 'Bt' in 'Bt cotton' indicates that it is a genetically modified crop produced through biotechnology (ii) The anticoagulant 'hirudin' is being produced from transgenic Brassica napus seeds (iii) 'Flavr Savr' transgenic tomatoes remain fresh for a longer period than the normal tomato variety (iv) Golden rice is a transgenic variety of Oryza sativa, which is rich in beta-carotene and helps to prevent night blindness.

Answer»

(i) only
(i) and (iv)
(II) and (iii)
(i),(ii),(iii) and (iv)

SOLUTION :Bt in Bt COTTON STANDS for Bacillus thuringiensis.
7533.

Question : Study the following statements and select the correct ones. i) Organisms restricted to a narrow range of temperatures are called eurythermal. ii) Organisms capable of tolerating a wide range of temperature are called stenothermal organisms. iii) The levels of thermal tolerance of different species determine to a large extent their geographical disrributio. iv) Temperature affects the kinetics of enzymes.

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

ANSWER :B
7534.

Question : Study the following statements and select the correct ones (i) Methanogens are archeabacteria which produce methane in marshy areas (ii) Nostoc is a filamentous blue green alga which fixes atmospheric nitrogen. (iii) Many membres of the genus Glomus form my corrhiza.

Answer»

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

ANSWER :D
7535.

Question : Study the following statement and choose the option: (I) Tapetum nourishes the developing pollen grains (II) Hilum represents the junctions between ovule and funicle (III) In aquatic plant such as water hyacinth and water lily, pollination by water (IV) The primary endosperm nucleus is triploid(A) I and II are correct but III and IV are incorrect(B) I, II and IV are correct but III is incorrect(C) II, III and IV are correct but I is incorrect(D) I and IV are correct but II and III are incorrect

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I and II are CORRECT but III and IV are incorrect
I, II and IV are correct but III is incorrect
II, III and IV are correct but I is incorrect
I and IV are correct but II and III are incorrect

Answer :B
7536.

Question :Study the following statements.A) Glucose is a higb threshold substance. B) Urine is concentrated in Henle's loop C) Haemodialysis removes urea, uric acid, glucose and water. D) Plasma proteins are filtered outCorrect ones of the above are

Answer»

A, C, D
B, C, D
A, B
A, C

Answer :C
7537.

Question : Study the followingstatements and select the correct ones

Answer»

AUXIN is transported from BASE to tip in large quantities
Cellson the dark SIDE expandfarther than thoseon the light side
Apical DOMINACE can beremoved by the decapitation
Tropic movementsin pantsare under thecontrol of gibberellins

Answer :C
7538.

Question : Study the following pathogens I Yersinia pestis II. Borrelia sp III. Odium albicans IV. Microbacterium leprae V. Haemophilus gallinarium Which of the above cause damage to poultry industry?

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I and IV
III and V
II and V
IV and V

Answer :B
7539.

Question : Study the following pedigree. The transmission of the trait indicates

Answer»

AUTOSOMAL dominance
maternal imprinting
paternal imprinting
mitochondrial inheritance

Answer :D
7540.

Question : Study the following pathogens:

Answer»

Yersinia pestis
Borrelia sp.
Odium albicans
Haemophilus gallinarum

Solution :N//A
7541.

Question : Hormone that maintains the blood glucose level within the limit is

Answer»

II,IV and VI
I,III and V
I,IV and VI
II,III and V

Answer :A
7542.

Question : Study the following figures and identify the enzymes involved in steps I and II.

Answer»

EcoRl and DNA Ligase
Hind II and DNA Ligase
EcoRi and HINDII
RESTRICTION ENDONUCLEASE and exonuclease

Answer :A
7543.

Question : Study the following flow chart. Name the hormones involved at each stage. Explain their functions.

Answer»

Solution :
Hypothalamus secretes gonadotropin releasing hormone (GnRH) which stimulates the ANTERIOR lobe of pituitary gland to secrete LH (Lutenising hormone) and FSH (Follicle STIMULATING hormone).
LH stimulate Leydig cells and causes the secretion of testosterone from the testes.
FSH stimulates Sertoli cells of the testies to secrete an androgen-binding protein (ABP) that concentrates testosterone in seminiferous tubules. It also causes the secretion of some factors which help in SPERMATOGENESIS.
7544.

Question :Study the following flow chart and identify the attributes X and Y.

Answer»


ANSWER :B
7545.

Question : Study the following figures Identify the true statement with referrence to psi values of A, B and C

Answer»

A greater than B but LESS than C
B greater than C but less than A
C less than B but greater than A
A greater than C but EQUAL to B

Answer :B
7546.

Question : Study the following flow chart and choose the correct option.

Answer»

'B' and '0' cause a positive change while 'I' and 'E' cause a negative change in 'N'
If a NEW habitat is just being COLONISED, 'B' MAY contribute more significantly to 'N' than 'I'
'N' will INCREASE only when (B+I) is greater than (D+E)
'B' and 'I' are most influential factors under normal conditions while 'D' and 'E' assume importance only under special conditions

Answer :B
7547.

Question :Study the following figure. The correct one about 'A', 'B', 'C' and 'D' is

Answer»

'A' is bile duct while 'C' is ILEUM
'B' is bile duct while 'C' is ielum
'D' is CYSTIC duct while 'A' is PANCREATIC duct
'B' is hepatopancreatic duct while 'D' is bile duct

Answer :C
7548.

Question : Study the following cross and answer the questions.Write the genotypes of Father,Mother and Son.

Answer»

SOLUTION :FATHER `I^A` i
MOTHER `I^B` i
Son-ii
7549.

Question : Study the following cross and answer the questions.The type of dominance of human blood group inheritance is_________

Answer»

SOLUTION :Co-dominance
7550.

Question : Study the following columns and choose the correct option.

Answer»

A B C D
1 4 5 3
A B C D
5 2 3 4
A B C D
2 3 5 1
A B C D
3 2 4 1

Answer :D