List of top Questions asked in GATE GG, GATE EY

The prevalence of flu in a population is 1%. A diagnostic test has a false positive rate of 10% and a false negative rate of 10%. The probability that a randomly chosen person tests positive is ________ (Round off to three decimal places).
In a deer population, the male-to-female ratio is 1 : 2. The probability that a randomly formed group of size three has 2 males and 1 female is ________ (Round off to two decimal places).
Gene conversion can lead to which one or more of the following evolutionary outcomes?
If the observed heterozygosity at a locus is 0.6, which one or more of the following could produce this outcome?
Which one or more of the following reasons has/have been invoked to explain high species diversity in the tropics?
The genome of an organism has 60% GC (Guanine-Cytosine) content. The Adenine in this genome is ________% (Answer in integer).
In a linear regression with a single continuous predictor and 100 data points, the residual degrees of freedom are ________ (Answer in integer).
Which one or more of the following conditions can lead to an increase in tree densities in tropical savannas?
Which one or more of the following options represent(s) an evolutionary arms race?
Which one or more of the following reason(s) explain(s) why whales use low frequencies (infrasound) for mate-finding and high frequencies (ultrasound) for hunting prey?
The table shows the relative abundance of three potential prey species in the environment and in the diet of a bat predator.
Which one or more of the following genes/markers is/are typically used for species identification?
A bee species forages for nectar on a plant species which has yellow flowers. To find out what cues the bees use to recognize the flowers, researchers performed the following experiment. They presented individual bees with the stimuli given below and examined the proportion of bees that approached and landed on the stimuli. The results are shown below.
Which one or more of the following interpretation(s) of the experiment is/are correct?
The figure shows an \(F\) probability density function. The two dotted lines represent critical values corresponding to a two-tailed \(F\)-test at a level of significance of 0.05. The observed \(F\)-statistic for two samples is indicated by the solid line.
A team of ecologists laid 100 plots of 50 m \(\times\) 50 m in a forest and counted the number of individuals of a tree species in each plot. They then calculated the mean and variance of the number of individuals per plot. If trees are randomly distributed, then which one of the following relationships between the variance and mean is expected?
\(\beta\)-diversity quantifies the difference in species composition between two ecological communities. Which one of the following statements is correct about \(\beta\)-diversity?
Some lizard species show positive allometry in head width, with larger individuals investing disproportionately more in musculature leading to wider heads. To test for positive allometry in a study population, a researcher measures body size and head width for 100 individuals and fits a straight line to a log-log plot of these two traits. Which one of the following estimated values of the slope indicates support for positive allometry?
Consider the logistic population growth model, given by \[ \frac{dn}{dt} = r n \left( 1 - \frac{n}{k} \right) \] where \(r\) is the intrinsic growth rate, \(n\) is the population size, and \(k\) is the carrying capacity. Which one or more of the following is/are assumption(s) of the model?
Which one of the following cladograms represents the correct phylogenetic relationships in the Kingdom Animalia?
The following graphs show rank abundance data for species in three different communities P, Q and R. Based on both species richness and relative abundance, which one of the following options correctly represents the ordering of communities according to their species diversity?
S1 and S2 are two strains of bacteria. The results of a bacterial growth experiment on these strains measured after 24 hours are shown. Black and white bars represent S1 and S2, respectively.
The Bateman gradient is a popular explanation for why the strength of sexual selection is typically stronger on males than on females. Which one of the following figures is the correct representation of the Bateman gradient? In all figures, the dotted line represents males and the solid line females.
Sparrows use two foraging tactics to obtain food. They either search for grains themselves (Producer tactic P) or follow other individuals and steal grains from them (Scrounger tactic S). The following graphs show how the fitness of each tactic (P : dashed line and S : solid line) varies as a function of the relative frequency of S. Which one of the graphs shows the correct representation of these tactics if they were maintained through negative frequency dependence?
In a population of birds on an island, the average beak size reduced over one generation. A researcher estimated the association between beak size and relative fitness, shown in the graph. The estimated slope was \(-0.05\) with a 95% confidence interval of \(-0.15\) to \(0.09\).
Consider Holling’s Type-III functional response, as shown.
Which one of the marked points has the highest rate-of-change of prey-capture-rate?