Previous Year Questions

QUESTION ID:2

The CO2 dissociation curves of oxygenated and deoxygenated blood are given along with dissolved CO2: below

Following are the statements deduced from the curves above and or based on the knowledge about CO2 transport, which may or may not be correct:

A. The deoxygenated haemoglobin has greater affinity for CO, than oxygenated haemoglobin.

B. The deoxygenated haemoglobin does not bind with free H+ ions released during theformation of HCO3- from CO2.

C. The haemoglobin saturation with O2 has no effect on CO2, dissociation curve.

D. O2 and CO2 bind to haemoglobin at different sites.

Which one of the following options represents a combination of all correct statements?

QUESTION ID:3

Given below are the different intervals/ durations of electrocardiogram of a humansubject (column A) and the events in heart during the process (column B).

Which one of the following options is a correct match of entries in columns A and B?

QUESTION ID:4

The pathway of synthesis of aldosterone in zona glomerulosa along with the intracellular locations is shown below:

Which one of due following options represents correct matches for A, B and C?

QUESTION ID:5

Given below is a figure of pro-opio melanocortin (POMC) polypeptide and its cleavage products (marked as A, B, C, D) which have different hormonal activities. The names of the cleaved products obtained from POMC are shown in the table below the diagram.

Which one of due following options represents A. B, C and D correctly?

QUESTION ID:6

During prolonged illumination,rhodopsin is desentitized which leads to the termination of visual response.The associated proteins (Colum A) and their effects (Column B) are given below:

Which one of the matched combinations is correct.

QUESTION ID:7

Estrus cycle in rats is controlled by pituitary and gonadal harmones.While treating a set of rat with vitamin D, a student accidentally injected the rat with an inhibitor of 17 α- hydroxypregnenolone and checked vaginal smear for 10 consecutive days.

Which one of the following observation is correct?

QUESTION ID:8

Centromere postions can be mapped in linear tetrads in some fungi. A cross was made between two strains a b and a+b+ and 100 linear tetrads were analysed. The genes a and b are located on two arms of the chromosome. The tetrad were divided into 5 classes as shown below.

Based on the above observation the following conclusion were drawn:

(A) Class 1 is a result of a cross over between ‘a’ and the centromere.

(B) Class 2 is result of double crossover involving 3 strands between ‘a’ and the centromere.

(C) Class 5 is a result of a double crossover between ‘a’ centromere and ‘b’ centromere.

(D) Class 4 is a result of a double cross over involving all the 4 strands.

Which one of the following options represents all correct statements?

QUESTION ID:9

Two Yellow mice with straight hair were crossed and the following progeny was obtained:

1/2 Yellow, straight hair

1/6 Yellow, fuzzy hair

1/4 gray, straight hair

1/12 gray, fuzzy hair

In order to provide genetic explanation for the results and assign genotypes to the parents and progeny of this cross the following statements were given:

(A) The 6:2:3:1 ratio obtained here indicates recessive epistasis.

(B) This cross concerns two independent characteristics –body colour and type of hair.

(C) The deviation of dihybrid ratio from 9:3:3:1 to 6:2:3:1 may be due to one of the genes being a recessive lethal

(D) The lethal allele is associated with straight hair

The most appropriate combination of statements to provide genetic explanation for the result is:

QUESTION ID:10

A Family was examined for a given trait which is represented in the pedigree shown below. Further, the degree of expression of the trait is highly variable among members of the family; some are only slightly affected while others developed severe symptoms at an early stage

The following statements are made to explain the pattern of inheritance shown in the pedigree.

(A)X-linked dominant mutation

(B) X-linked recessive mutation

(C) Mitochondrial inheritance

(D) Vairiable expression can be due to heteroplasty

The best possible explanation for this inheritance is

QUESTION ID:11

The location of six deletion (Shows as solid line underneath the chromosomes) has been mapped to the Drosophila chromosome as shown in the diagram given below:

The recessive mutations a, b, c, d, e f and g are known to be located in the region of deletions, but order of mutations on the chromosome is not known. When flies homozygous for the recessive mutations are crossed with flies homozygous for the deletion, the following result were obtained where the letter ‘m’ represents a mutant phenotype and ‘+’ represents the wild type.

The relative order of the seven mutant genes on chromosome is :

QUESTION ID:12

In the following pedigree , individuals with shaded circle or shaded square show presence of a recessive autosomal trait.

The calculated risk of occurance of this trait for III-I is

QUESTION ID:13

During the course of vertebrate evolution , the jaw bones got modified into three ear ossicles in mammals. Which one of the following is a correct match of ear ossicle and its ancestral jaw bone ?

QUESTION ID:14

Given below are names of the animals in column X and the accessory respiratory organs teleost fishes (Column Y).

The correct match of the animals with the accessory respiratory organs they have are:

QUESTION ID:15

The terms expressing some of the developmental events or specific body structures are given in column X and the names of animals that are associated with them in column Y:

The correct match of the terms in column X with the name of animals in column Y is:

QUESTION ID:16

The table lists characteristic anatomical features and names of plants.

Choose the option that correctly matches plant with their characteristic features.

QUESTION ID:17

The table given below provides a list of female gametophyte features and plant genera

Which one of the following options correctly matches the plant genera to female gametophyte features:

QUESTION ID:18

Following are some generalizations related to wood anatomy of higher plants:

A. The axial system of conifer woods consist mainly or entirely of tracheids.

B. The rays of conifers typically contain only parenchyma cells.

C. The rays of angiosperms typically contain both sclerenchyma cells and tracheids.

D. Angiosperm wood may be either diffuse porous or ring-porous.

Which one of the following options represents all correct statements?

QUESTION ID:19

A field ecologist gathers following data (abundance values) in order to study diversity of species in four plant communities.

Based on the above observations, the ecologist draws following conclusions:

A. Plant communities C1 and C4 show strong similarity with each other

B. Plant communities C1 and C4 as well as communities C2 and C3 show strong similarity with each other

C. Plant community C1 is most diverse

D. Plant community C4 is most diverse

Which of the following statements is correct regarding above conclusions?

QUESTION ID:20

The table given below lists types of plant communities and types of growth forms.

Which of the following is the best match for the plant communities with most dominant growth form generally present in that community?

QUESTION ID:21

Following are some of the generalizations regarding energy flow in an ecosystem:

A. Assimilation efficiency of carnivores is higher than herbivores.

B. Consumption efficiency of aquatic herbivores is higher than terrestrial herbivores.

C. Vertebrates have higher production efficiencies than invertebrates.

D. Trophic level transfer efficiency is higher in terrestrial food chains than in marine.

Based on the above, select the correct option.

QUESTION ID:22

In an experiment to show that biogeochemical cycles interact, nitrogen fixing vines (Galactia sp.) were grown in plots under normal levels of CO2 (Control) and under artificially elevated atmospheric CO2 (Experimental). Effect of elevated CO2 levels on nitrogen fixation was measured over a period of 7 years (Plot A) and the concentrations of iron and molybdenum in the leaves of these plants were quantified at the end of the study (Plot B). Which one of the following inferences CANNOT be made from the above experiment?

QUESTION ID:23

Match the following invasive plants to the likely habitats in which they are expected to occur:

QUESTION ID:24

Incorporating additional ecological factors into the Lotka-Voltera predator-prey model can change the predator isocline. Given below are three state-space graphs (A-C) representing modification of predator isocline due to the ecological factors listed below (i-iii).

(i) Victim abundance acting as predator carrying capacity

(ii) Availability of alternate prey (victim) population

(iii) Predator carrying capacity determined

Which one of the following options represents all correct matches of the state space graphs with their ecological factor?

QUESTION ID:25

Birds in a population show two foraging phenotypes: A and B. Birds of phenotype A search, attack and capture prey while birds of phenotype B steal prey from birds of phenotype A. A and B are maintained in the population through negative frequency-dependent selection. The graph below shows the fitness of A (broken line) and B (solid line) at different relative frequencies of A (frequency of B = 1-frequency of A).

Which of the following statements does the grap support?

QUESTION ID:26

Antelopes are proposed to form groups to reduce the risk of predation. A researcher measured the predation of individuals in groups of different sizes. She found that per capita mortality risk decreased with increasing group size for males (solid line) but remained unchanged for female (dashed line). Furthermore, males in all groups experienced greater per capita mortality risk than females.

Identify the graph below that best depicts the above findings:

QUESTION ID:27

The prominent mammal species found in four different protected areas are listed below:

Area A: Tiger, Wild dog, Leopard, Elephant

Area B: Common langur. Barking deer, Wild dog, Elephant

Area C: Tiger, Indian rhinoceros, Pygmy hog, Wild pig

The area with the greatest phylogenetic diversity is

QUESTION ID:28

The Hardy-Weinberg principle states that allele frequencies in a population will remain constant over generations if certain assumptions are met.

A. Random mating

B. Mate choice

C. Small population size

D. Large population size

E. Lack of mutations

F. Directional selection

Which of the above factors will cause changes in allele frequencies overgenerations?

QUESTION ID:29

Given below are few traits and related functions:

Match the above given traits to their most likely functions.

QUESTION ID:30

Following is a diagrammatic representation of human evolutionary tree.

In the above diagram A, B, C and D respectively represent:

QUESTION ID:31

Based upon phenotypic observation, it was concluded that an unknown gene responsible for an agronomically important trait is present in a particular plant. In order to identify the gene, a researcher proposes to use the following strategies:

A. PCR amplification of the gene.

B. Map based cloning of the gene.

C. Subtractive DNA hybridization

D. Genome sequencing

E. Develop molecular markers linked to the trait

Which one of the following options is most suitable for identifying unknown gene?

QUESTION ID:32

A To transgenic plant contains two unlinked copies of the T- DNA of which one is functional and the other is silenced. Segregation of the transgenic to non transgenic phenotype would occur in a

(i) Ratio in progeny obtained by backcrossing and in a

(ii) ration in F1 progeny obtained by self pollination.

Fill in the blanks with the correct combination of (i) and

(ii) from the options given below:

QUESTION ID:33

Column X lists two diseases and column Y lists name of proteins which are commonly used for routine clinical diagnosis of these diseases

Find out correct combination.

QUESTION ID:34

Given below are the steps to assess the population size of grasshoppers in a given area:

A. 'n' individuals are collected randomly from the study area in a defined period of time.

B. The captured individuals are counted, marked and released at the site of collection.

Next day, individuals are captured from the same site for same length of time. Number of marked (nM) and unmarked (nU)

C. This capture-release and recapture is continued till one gets 100% marked individuals

D. The size of the population (N) is estimated as follows:

E. The size of population (N) is estimated as follows:

The most appropriate combination of steps for estimating population size using mark-recapture method is:

QUESTION ID:35

A neurophysiolgist was interested in using the patch-clamp technique. Following statements are related to this technique:

A. Intracellular movement of ion channels.

B. Post–translational modification of the ion channel protein

C. Ligand that controls the opening or closing of ion channels.

D. Change in current flow in a single ion channel.

Which one of the following combinations will be achievable using the patch-clamp technique?

QUESTION ID:36

The blood plasma proteins(albumin and globulins) from a healthy person were separated by electrophoresis as shown above. The diagnosis of acute inflammation can be done based on one of the following observations.

QUESTION ID:37

Following statements were given regarding factors influencing variation in expression levels of transgene in transgenic plants:

A. Difference in restriction enzyme sites within the T- DNA.

B. Difference in copy number of the transgene.

C. Variations in site of integration of the T- DNA within the plant genome.

D. Presence of multiple promoters within the T-DNA region.

Which one of the following options represents a combinations of statements that would NOT lead to variations in transgene expression levels in transgenic

plants generated using the same T-DNA/ binary vector?

QUESTION ID:38

The above figure shows the fluorescence emission spectra of three different proteins; Protein (X), Protein (Y), and Protein (Z) excited at 280 nm. Which one of the following statements gives the correct interpretation?

QUESTION ID:39

Specimens for light microscopy are commonly fixed with a solution containing chemicals that crosslink/denature cellular constituents. Commonly used fixatives such as formaldehyde and methanol could act in various ways as described below:

A. Formaldehyde crosslinks amino groups on adjacent molecules and stabilizes protein-protein and protein-nucleic acid interactions.

B. Methanol acts as a denaturing fixative and acts by reducing the solubility of protein molecules by disrupting hydrophobic interactions.

C. Formaldehyde crosslinks lipid tails in biological membranes.

D. Methanol acts on nucleic acids. crosslinks nucleic acids with proteins and thus stabilizes protein-nucleic acid interactions.

Which one of the following combinations represents all correct statements?

QUESTION ID:40

Run off transcription assays were performed to establish the specificity of three novel sigma factors for their promoters. Result of the experiments are shown below:

Following inferences were made from these results:

A. σA intiates transcription from P2 and σB from P1

B. σC can intiates transcription from both promoters.

C. σB Prevents intiation of transcription from P2

D. σA Intiates transcription from P1

Choose the option that correctly interprets that results?