0 of 55 questions completed
GATE Mock Test – EY
Click Start and take the Test…
You have already completed the Test before. Hence you can not start it again.
Test is loading...
You must sign in or sign up to start the Test.
You have to finish following quiz, to start this Test:
Congratulations!!!" GATE - EY "
0 of 55 questions answered correctly
Time has elapsed
Your Final Score is : 0
You have attempted : 0
Number of Correct Questions : 0 and scored 0
Number of Incorrect Questions : 0 and Negative marks 0
|Table is loading|
|No data available|
Question 1 of 55
Darwin’s ideas on evolution by natural selection were influenced by
Question 2 of 55
Which of the following statements about the evolution of humans is believed to be TRUE?
Question 3 of 55
On average, which ecosystem has the LOWEST net primary productivity per unit area?
Question 4 of 55
A researcher measures the height of 100 trees of a species. The mean of these observations is 50 and the variance is 16. The standard error of the mean calculated from these observations is ______
Question 5 of 55
A researcher tested for the presence of parasitic infection in 100 male and 100 female deer. Forty males and 30 females were found to be infected. To test if males are significantly more susceptible to infection than females, which of the following is an appropriate statistical test?
Question 6 of 55
The frequency of the dominant red allele (R) in a population of diploid organisms is equal to the frequency of the recessive white allele (r). The frequency of red individuals assuming Hardy-Weinberg equilibrium(express the frequency using decimal notation, not as a fraction or a percentage) _______________________
Question 7 of 55
Two sympatric species of fruit flies congregate on the fruit of two closely related species of trees for mating. The cue most likely to be used by these fly species to locate their mates from a long distance would be
Question 8 of 55
Human activities release about 7 x 1015 g of CO2 into the atmosphere every year. Of this, about 3 x 1015 g accumulates in the atmosphere. Another 2 x 1015 g is absorbed by the oceans. The remaining 2 x 1015 g enters the “missing carbon sink.” This sink is best explained by which of the following?
Question 9 of 55
The slope of a function is zero
Question 10 of 55
According to foraging theory, if two food items are commonly available and equally abundant, an optimal forager should choose the item that
Question 11 of 55
Phenotypic plasticity refers to
Question 12 of 55
The coefficient of determination, R2, represents how well a linear model fits the data. R2 is the sum of squared deviations of observations from the regression line divided by the total sum of squared deviations from the mean value. For the figure below, R2 is closest to
Question 13 of 55
Death feigning behaviour (i.e., pretending to be dead when attacked) is found in snakes and millipedes. This similarity in behaviour between snakes and millipedes is an example of
Question 14 of 55
To evaluate the relationship between two variables (e.g., resource abundance and population density), a linear regression can be used. Here, the statistical null hypothesis which allows us to evaluate whether there is a relationship between these variables is
Question 15 of 55
Which of the following conditions is NOT necessary for evolution by natural selection?
Question 16 of 55
C3, C4 and CAM are the main photosynthetic pathways in plants. The relative abundance of C3 plants __________________ with increasing latitude
Question 17 of 55
The pyramidal structure of decreasing biomass with increasing trophic level in terrestrial ecosystems is a consequence of:
Question 18 of 55
Typical green leaves from plants absorb light of the following colour/s:
Question 19 of 55
Christian Bergmann, a 19th century biologist, observed that related taxa showed increasing body size with increasing latitude. One explanation for this pattern, also called ‘Bergmann’s Rule’, is
Question 20 of 55
All else being equal, in a species with two sexes, which of the following is true with regard to mate choice?
Question 21 of 55
Temperate organisms have wider tolerance ranges for temperature than do tropical organisms. If temperatures increase across the globe by 2°C, which of the following is possible?
Question 22 of 55
The length of Henle’s loop in the kidneys of rodents is longest in
Question 23 of 55
A recent experiment with a fast growing variety of tomato studied the inheritance of two traits – dwarfism and flower colour. The experiment successfully demonstrated Mendel’s law of segregation and for both traits the expected 3:1 ratio of dominant to recessive phenotype was observed. However, the experiment failed to demonstrate the law of independent assortment for the two traits. One possible reason for this is
Question 24 of 55
Grazing by large herbivores can increase plant diversity by which of the following mechanisms?
- Reducing abundance of dominant plants and favouring rare species
- Accelerating rates of nutrient cycling in the ecosystem
- Promoting photo-respiration by increasing ambient CO2 concentration
- Decreasing stomatal conductance which promotes biomass production
Question 25 of 55
The doubling time for a bacterial population is 60 minutes. Given a density of 35 cells/ml in a population in its exponential growth phase and assuming unlimited resources, the number of hours that the population will take to grow to 560 cells/ml is _________________
Question 26 of 55
Birds that are brood parasites lay eggs in the nests of other birds. This is a successful strategy for the parasite only if
Question 27 of 55
What should be the sound frequency ranges used for acoustic communication between two herds of elephants living far apart in isolated forests, domestic dogs in neighbouring streets, and insect feeding bats catching prey above the tree canopy?
Question 28 of 55
A student grows a bacterial culture in a container starting with a small population size and high resource levels. To estimate population growth, the student puts the container on a weighing machine after air-tight sealing of the container to avoid contamination. Which of the following graphs is the most likely result obtained in the experiment?
Question 29 of 55
Birds show much variation in sexual size dimorphism (body size differences between males and females), which is hypothesized to be associated with their mating system. Match the two groups below to reflect the expected pattern in mating system and sexual size dimorphism in birds.
Mating system Size dimorphism i Monogamy (1 male and 1 female) P Males larger than females ii Polygyny (1 male and many females) Q Females larger than males iii Polyandry (1 female and many males) R Males and females similar in size
Question 30 of 55
Consider the following frequency distribution of an ecological variable:
Such a distribution with two peaks is called a bi-modal distribution. Here, the peak with the higher frequency is called the major mode and the one with the lower frequency is called the minor mode. A student has marked four points on the x-axis, i.e., P, Q, R and S. Match the points with the most appropriate statistic: Mean, Median, Major mode, and Minor mode
Question 31 of 55
In blackbuck, it has been hypothesized that the reproductive fitness of an individual depends on the group size as given below.
Two groups of unrelated individuals,labelled as G1 and G2 ,encounter each other.Note that G2 is at the optimal group size. Individuals from each group can decide whether to stay in their group, or join the other group. Individuals cannot prevent others from leaving or joining any group. Under these circumstances, which of the following is most likely?
Question 32 of 55
In certain cases, a critical group size of organisms is required before a certain action, such as secretion of an enzyme, is taken by individuals of the group. This can be graphically represented as shown below.
A student conducts experiments and collects data to study this behaviour in her favourite system.
Instead of plotting P vs. G, the student plots G (on the y-axis) vs. P (on the x-axis). Assuming that her system did indeed exhibit the group behaviour of the type shown above, how will her modified plot look?
Question 33 of 55
All adults of a fish species have bright colour patterns in population P and all adults have dull colour patterns in population Q. Colour patterns in this species are determined early in development. Which of the following study designs is best suited to test whether this colour pattern difference has a genetic basis?
Question 34 of 55
The figure below shows how competition among foragers in a resource patch reduces individual foraging rates. According to this figure, the expected foraging rate for a solitary individual is ____________
Question 35 of 55
Find the matching triplet
1. Invasive species p. Ficusbenghalensis i. wind-dispersed fruit 2. Keystone species q. Lantanacamara ii. bat-dispersed fruit 3. Endemic species r. Tectonagrandis iii. ant-dispersed fruit 4. Exotic species s. Partheniumhysterophorus iv. bird-dispersed fruit
Question 36 of 55
In birds that pair during the breeding season, it is hypothesized that males need to aggressively guard their mates against mating with intruder males. To test this hypothesis, a scientist presents a male dummy bird to a male bird on his territory just before the female lays her eggs. The dummy is left on the territory. The male was aggressive towards the dummy before the eggs were laid and this aggression declined after egg-laying. Which additional experimentwillNOT provide further information totest this hypothesis?
Question 37 of 55
The figure panels below show population growth in two species, when they are grown alone, and also when they are grown together. From the nature of their growth curves, one can infer that the interaction between these species is an example of
Question 38 of 55
There are two coins in a bowl. Because of differences in the size of the two coins, the probability of picking the bigger coin is 0.6. The bigger coin is unbiased, whereas the smaller coin has a probability of 0.6 of yielding heads. A blind-folded student picks a coin from the bowl and tosses the coin. The probability (expressed using decimal notation, not as a fraction or percentage) that the coin yields a head is ________
Question 39 of 55
The accompanying figure shows logistic population growth for two species in the same habitat.
Which of the following conclusions hold true?
- Species 1 has higher intrinsic growth rate
- Species 2 has higher intrinsic growth rate
- Carrying capacity for Species 1 is higher
- Carrying capacity for Species 2 is higher
Question 40 of 55
Which of these is true with respect to Batesian mimicry?
Question 41 of 55
In the phylogeny below, branch lengths are proportional to the percent sequence divergence. The scale below the phylogeny indicates branch length. Assume that the gene used to reconstruct the phylogeny of the species evolves in a clock-like fashion. It is known that the divergence between Species 4 and Species 5 happened 2 million years ago. The time of divergence (in million years)between Species 3 and Species 1 is ______________
Question 42 of 55
Humans have a preference for high calorie foods. Assume a study has shown that (i) the life expectancy of human beings has reduced from 85 to 74 years due to increased consumption of high calorie foods, and (ii) the maximum reproductive age is 70 years. Given these assumptions, which of the following is most likely to happen in the next 200 years?
Question 43 of 55
A recently discovered fossil contains 3.125% of 14C found in present day organisms. If the half-life of 14C is 5730 years, the age of the fossil in years is ____________
Question 44 of 55
In the hypothetical scenario below, there are four small islands (P, Q, R and S) near a very large continent. The distances of the islands from the continent, as well as the sizes of the islands, vary as indicated in the diagram. Assume that dispersal happens only between the continent and the islands, but not among islands. The theory of island biogeography would predict that the number of species in each island will be best represented by which of the following?
Question 45 of 55
There are 19500 ants of a species on a small island of area 400 sq m. A student collects 1500 ants in 30 randomly placed pit-fall traps. She marks all of them with blue paint and releases them. Due to unusually low temperatures the following night, the ant population on the island experiences 10% mortality. The next day the student lays out another series of randomly placed pit-fall traps and collects 1183 ants. Assuming that (i) mortality is not affected by being painted, (ii) probability of falling into a trap is not affected by being painted, and (iii) probability of falling into a trap is not affected by the density of ants on the island, the expected number of ants with blue marks in the sample is ____________
Question 46 of 55
A student wants to test the effect of latitude and longitude on seed size in a plant species. He has the resources to lay a maximum of 9 plots. Which plot designis most appropriate for this question?
Question 47 of 55
In an experiment, cows were allowed to graze in closed pastures either with wild deer or without wild deer. This experiment was done in the rainy and dry seasons. The results for weight gain in the cows (mean and 95% confidence interval) are shown in the figure below. Based on these results which of the following statements is true?
Question 48 of 55
The figure below shows how reproductive fitness varies with tail length in a bird species. Given this pattern, what kind of selection is most likely to act on tail length in this population?
Question 49 of 55
A study monitored insect abundance and drought stress in trees for a period of 10 years in a tropical dry deciduous forest. This study found a strong, statistically significant, negative relationship between insect abundance and drought stress in trees. Based on these results, what can be inferred about the causal relationship between insect abundance and drought stress in trees?
Question 50 of 55
Assume that a piece of bamboo is a hollow cylinder of negligible wall thickness.The numerical value (in cm) of the ratio of thevolume to surface area of such a bamboo,measuring 6 cm in diameter, is ____________
Question 51 of 55
Simpson’s index of species diversity is given by
wherepp ii is the proportion of species i in the total sample of individuals and n is the total number of species. For the species and their abundances given below, the numerical value of Simpson’s index is ___________________
Species Abundance Q 50 R 30 S 20 T 40 U 50 V 10
Question 52 of 55
Primary succession refers to the sequence of changes in plant communities at a newly formed habitat. Species establishing first at the newly formed habitat (pioneer species) show characteristics that are different from those in species that establish later in the community. Which of the following represents the predicted characteristics of pioneer species?
Question 53 of 55
Consider the two phylogenies. Which of the following statements is true?
Question 54 of 55
Species P and Species Q are respectively self-pollinated and cross-pollinated plants that are closely related. Their flowers are visited by bees. Correctly identify which sets of traits are characteristic of Species P relative to the traits of Species Q
Question 55 of 55
The Venn Diagram below shows numbers of species in three forest types. Which of the following statements is true?