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7551.

Question : Study the following carefully and explain why mutation (A) did not cause any sickle cell anemia in spite of change in the molecular structure of the gene which codes for Haemoglobin, when as a similar mutation (B) did. (The question is based on properties of the genetic code. c= codon, a = amino acid, Hb = Haemoglobin) Codons for Hb:C_1 - C_2 -C_3 -C_4 - C_5 -G AA -GAA-C_8... Amino acids in Hb : a_1-a_2-a_3-a_4-a_5- Glutamic acid- Glutamic acid -a_8...... (Normal Haemoglobin ) Mutation (A) : C_1 -C_2 - C_3 -C_4 -C_5-GAG-"GAA"-C_8...... a_1-a_2 - a_3-a_4-a_5-Glutamic acid -Glutamic acid -a_8.... (Normal Haemoglobin ) Mutation (B) : C_1 -C_2 - C_3 -C_4 -C_5-GAG-"GAA"-C_8...... a_1-a_2 - a_3-a_4-a_5-Valine-Glutamic acid -a_8.... (Sickle cell Haemoglobin )

Answer»

Solution :Genetic CODE degenerate le more than one code for one amino acid
- Both GAG GAA code for GLUTAMIC acid.
- Mutation of third base/nucleotide - to change in phenotype in mutation A/Wobble HYPOTHESIS
In case of change on 2nd codon of triplet code as in Mutation B. codon stands for a different amino acid valine
Hb BECOMES different normal Hb becomes Hbs / Structure of protein charged
Discussion
7552.

Question : Studythe followingand identifythe correct match

Answer»

II, iii
iii, iv
I, iii
I,iv

Solution :N//A
Discussion
7553.

Question : Study the following and identify the mismatch

Answer»

Simple DIFFUSION — Transport saturates
FACILITATED transport — Down hill transport
Active transport — Transport saturates
Both simple diffusion and facilitated transport — METABOLIC ENERGY is not required

Answer :A
Discussion
7554.

Question : Study the five statement (A-D) given below and select the correct statements :- (A) The cyanobacteria are unicellualr, colonial or filamentous algae. (B) Euglenoids are photosynthetic in the presence of sunlight when deprived of sunlight they behave like heterotrophs (C) In phycomycetes mycelium is aseptate and coenocytic (D) Bryophytes areplants which can live in soil but are dependent on water for sexual reproduction.

Answer»

A, B & C
C, D & A
A & B only
All STATEMENTS are correct

Answer :D
Discussion
7555.

Question : Study the following and choose the correct statements I)Hormones produced by adenohypohysis are protein hormones II)Hormones stores by neurohypophysis are peptide hormones III)Catecholamines are water soluble hormones IV)Thyroid hormone is derived from aminoacid the tyrosine

Answer»

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

Answer :B
Discussion
7556.

Question : Study the flow char given below. Name the hormones involved at each stage and in human female.

Answer»

SOLUTION :
Discussion
7557.

Question : Study the figures given below and answer the questions. Which type of cross produces higher recombinant percentage ? Give reason in support of your answer.

Answer»

Solution :(a) Cross B PRODUCES more RECOMBINANTS
(b) The gene e and f are LOCATED SUFFICIENTLY apart leading to crossing over resulting in recombinant varieties.
Discussion
7558.

Question : Study the figures (A) and (B) given below and answer the questions that follow: Under the influence of which type of Natural Selection would graph (A) become like graph (B)?

Answer»

SOLUTION :DISRUPTIVE SELECTION.
Discussion
7559.

Question : Study the figures (A) and (B) given below and answer the questions that follow: What could be the likely reasons of new variations arising in the population?

Answer»

Solution :When individuals of a population enter new ZONES with different habitats, individuals in each ZONE evolve SEPARATELY into new species, splitting the population into MANY SEPARATE species.
Discussion
7560.

Question : Study the figure of vector pBR322 given below in which foreign DNA is ligated at the Bam HI site of tetracyline resistance gene. (b) What will be the selectable marker for this recombinant plasmid and why?

Answer»

Solution :(b) SELECTABLE MAKER: AMPICILLIN resistance gene.It will help distinguishing TRANSFORMANTS from non-transformants after plating them on ampicillin CONTAINING medium.
Discussion
7561.

Question : Study the figure of vector pBR322 given below in which foreign DNA is ligated at the Bam HI site of tetracyline resistance gene. (c ) Explain transformation.

Answer»

Solution :(c ) Transformation : It is the PHENOMENON by which the DNA isolated from ONE TYPE of cell and INTRODUCED into another type,is able to bring about some of the properties of farmer to LATER.
Discussion
7562.

Question : Study the figure of vector pBR322 given below in which foreign DNA is ligated at the Bam HI site of tetracyline resistance gene. (a) Mention the function of rop.

Answer»

SOLUTION :(a) .ROP. CODES fro the proteins INVOLVED in the REPLICATION of plasmid
Discussion
7563.

Question : Study the figure given below and answer the questions that follow : Name the stage of human embryo the figure represents Identify 'a' in the figure and mention its function. Mention the fate of the inner cell mass after implantation in the uterus Where are the stem ceHs located in this embryo?

Answer»

SOLUTION :(a) Blastocyst
(b)'a' is trophoblast. The trophoblast layer GETS attached to endometrium and later forms extra embryonic membrane NAMELY chronic VILLI.
.The inner cell mass DIFFERENTIATES into the emhryo.
inner cell mass
Discussion
7564.

Question : Study the figure given: (i) Pick out the name of cells that undergo spermiogenesis.(ii) Name A, B, C and F.(iii) Geve ploidy of B and E. Mention the function of 'F' cell.

Answer»

SOLUTION :
Discussion
7565.

Question :Study the figure given below and answer the questions . How does the repressor molecule get inactivated?When does the transcription of lac mRNA stop?Name the enzyme transcribed by the gene 'z'.

Answer»

Solution : The Repressor MOLECULE gets inactivated in the presence of an INDUCER such as lactose or allolactose
When lactose is lacking or absent, the transcription of lac MRNA STOPS.
`beta`-GALACTOSIDASE
Discussion
7566.

Question : Study the diagram showing replication of HIV in humans and answer the following questions accordingly : (i) Write the chemical nature of the coatA . (ii) Name the enzymeBacting onXto produce molecule0 . N ame0 . (iii) Mention the riame of the host cellDthe HIV attacks first when it enters into the human body. (iv) Name the two different cells the new virusesEsuibsequently attack.

Answer»

Solution :(i) CoatAis MADE up of protein. (II) The enzymeV Bis REVERSE transcriptase,Cis viral DNA. (III) The host cellDis MACROPHAGE. (iv) The new virusesEsubsequently attack macrophages and helper T-lymphocytes
Discussion
7567.

Question : Study the diagram of the earth given below. Give the name of the pattern of biodiversity therein. Suggest any two reasons for this type of occurrence.

Answer»

Solution :Latitudinal gradients
(i) More solar energy AVAILABLE in TROPICS, more PRODUCTIVITY.
(ii) Tropical environments are less SEASONAL, so more predictable.
Discussion
7568.

Question : Study the diagramgiven below. Choose the correct pair(s) from the following. I. A-Reverse transcriptase II. B and C-capsid III. D-External capsid, C-Peplomer IV. C-External capsid Select the correct option from the codes given below.

Answer»

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

Answer :A
Discussion
7569.

Question : Study the cycle shown below and select the option which gives correct words for all the four blanks, A,B,C and D.

Answer»

`{:(A,B,C,D),("NITRIFICATION","AMMONIFICATION","ANIMALS","Plasts"):}`
`{:(A,B,C,D),("Dentrification","Ammonification","Plants","Animals"):}`
`{:(A,B,C,D),("Nitrification","Dentritification","Animals","Plants"):}`
`{:(A,B,C,D),("Dentrification","Nitrification","Plants","Animals"):}`

SOLUTION :A. Dentrification, B-Ammonification, C-plants, D-Animals
Discussion
7570.

Question : Study the charactristics of a population represented in the graphs below. Mark the correct graph that represents the type of selection that this population is likely to undergo

Answer»




Solution :It is observed that the individuals with larger body size, in the given population, are lesser in prroportion as compared to individuals with smaller or moderate body size. Also. Large BODIED individuals have low fitness, when natural SLECTION acts on such a population, it would FAVOUR smaller or moderate sized individuals, hence shifting the body size VS. frequency graph to the LEFT.
Discussion
7571.

Question : Study the above given figure and choose the correct match:-

Answer»

1
2
3
4

Answer :B
Discussion
7572.

Question : Study the above pedigree of an autosomal recessive disorder and identify genotypes of IA,IIA and IIB from the given options

Answer»

AA,Aa,Aa
AA,Aa,AA
AA,Aa,Aa
AA,AA,Aa

Answer :A
Discussion
7573.

Question : Study statement a-d (about organic farming) and find out the correct ones. (a) Utilises genetically modified crops like Bt cotton (b) Uses only naturally produced input like compost (c) Does not use pesticide and urea (d) Produces vegetables rich in vitamins and minerals

Answer»

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

Solution :In organic farming, farmers use manures, biofertilisers, BIOPESTICIDES and biocontrol agents to INCREASE the crop production INSTEAD of using artifical FERTILISERS andpesticideds. It does not utilise genetic engineering.
Discussion
7574.

Question : Study of tissue is called cytology.

Answer»


ANSWER :HISTOLOGY
Discussion
7575.

Question : Study of the relation between agricultural crops and environment.

Answer»


ANSWER :AGROECOLOGY
Discussion
7576.

Question : Study of raphides form the basis of

Answer»

Phenetics
Cytotaxonomy
Karyotaxonomy
Chemotaxonomy

Answer :D
Discussion
7577.

Question : Study of population trends is:

Answer»

Calligraphy
Psychobiology
Biography
Demography

Answer :D
Discussion
7578.

Question : Study of pollen grain is called

Answer»

Taxonomy
Palynology
Demography
Zoology

Answer :B
Discussion
7579.

Question : Study of pollen grain is called:

Answer»

Ethmology
Palynology
Paleobotany
NONE of these

Answer :B
Discussion
7580.

Question : Study of interrelationships between a species /individuals and its environment in all stages of its life cycle is

Answer»

SYNECOLOGY 
FOREST ECOLOGY
Autoecology 
Ecology 

ANSWER :C
Discussion
7581.

Question : Study of interrelationship between an entire community and its environment is

Answer»

AUTOECOLOGY 
RESOURCE ECOLOGY
Species ecology 
SYNECOLOGY 

ANSWER :D
Discussion
7582.

Question : study of internal relationship between a species or individual and its environment in all stages of its life cycle is

Answer»

Synecology
FOREST ECOLOGY
AUTECOLOGY
Ecology

Answer :C
Discussion
7583.

Question : study of inter-relationship between organisms and their environment is

Answer»

ecology
ecosystem
phytogeography
ETHOLOGY

ANSWER :A
Discussion
7584.

Question : Study of individuals in relation to environment.

Answer»


ANSWER :AUTECOLOGY
Discussion
7585.

Question : Study of human evolution is called

Answer»

archaeology
anthropology
pedigree analysis
chronobiology.

Solution :Archaeology is the study of human history through the excavation of SITES. Pedigree analysis is the study of an inherited trait in a group of related individuals to DETERMINE the PATTERN of the trait. Chronoiology is the branch of biology concerned with CYCLICAL PHYSIOLOGICAL phenomena.
Discussion
7586.

Question : Study of frequency of different genes and trends of their change is

Answer»

GENE pool
population GENETICS
gene FLOW
Hardy-Weinbers GENETIC equilibrium

Answer :B
Discussion
7587.

Question : Study of flowers is

Answer»

ANTHOLOGY
POMOLOGY
Floriculture
Spermology

Answer :A
Discussion
7588.

Question : Study of floral characters and timing of processes involved in fertilization in natural condition is called :

Answer»

ANTHESIS
Heterosis
Emasculation
Introduction

Answer :A
Discussion
7589.

Question : Study of communities and their relationships with environment is known as :

Answer»

AUTECOLOGY
SYNECOLOGY
Community
Ecosystem

Answer :B
Discussion
7590.

Question : Study of ecology of populationis called :

Answer»

AUTECOLOGY
Synecology
Ecotype
Demecology

Answer :D
Discussion
7591.

Question : Study of community is called_____.

Answer»


ANSWER :SYNECOLOGY
Discussion
7592.

Question : Study of cancer is called

Answer»

Serology
Oncology
Histology
Carcinology

Answer :B
Discussion
7593.

Question : Study of Biogeochemical cycles is called Biogeochemistry its father is Vernadsky (=winodgsky). It involves.

Answer»

CYCLING of ENERGY
Cycling of GASES
Cycling of NUTRIENTS
Cycling of water

Answer :C
Discussion
7594.

Question : Study of birds is called

Answer»

Palentology
Orinthology
Icthyology
Serpentology

Answer :B
Discussion
7595.

Question : Study of action of drugs is called :

Answer»

Pharamacology
Physiology
Pharmalogy
Pharmaceutical chemistry

Answer :A
Discussion
7596.

Question : Study of soil.

Answer»


ANSWER :PENOLOGY
Discussion
7597.

Question : Study in following columns :

Answer»

4,5,3,1
2,3,4,5
3,4,1,2
1,5,2,4

Answer :C
Discussion
7598.

Question : Study dealing with body's defence mechanism against disease is called………

Answer»

Pathology
Immunology
Microbiology
Dermatology
Discussion
7599.

Question : Study a part of the life cycle of malarial parasite given below. Answer the questions that follows: (a) Mention the roles of 'A' in the life cycle of the malarial parasite. (b) Name the event 'C' and the organ where this event occurs . (c) Identify the organ 'B' and name the cells being released from it.

Answer»

Solution :(a) A is female ANOPHELES mosquito that ACTS as vector for plasmodium. LTBEGT (B) C-fertilization that takes place in mosquito gut.
(c) B-salivary gland cells which release sporozoites of plasmodium.
Discussion
7600.

Question : Study above the given graph and find out the correct statement regarding this :-

Answer»

B is in the presence of non competitive inhibitor.
B is in the presence of competitive inhibitor
In competitive INHIBITION, the inhibitor molecule is CHEMICALLY CHANGED by the enzyme
The presence of the competitive inhibitor decreases the `K_(m)` of the enzymes for the substrate

Answer :B
Discussion