Ecology And Evolution - Ey 2016 GATE Paper (Practice Test) - GATE MCQ

(x % of y) + (y % of x) is equivalent to ________- .

The sum of the digits of a two digit number is 12. If the new number formed by reversing the digits is greater than the original number by 54, find the original number.

Q. 6 – Q. 10 carry two marks each.

Two finance companies, P and Q, declared fixed annual rates of interest on the amounts invested with them. The rates of interest offered by these companies may differ from year to year. Year-wise annual rates of interest offered by these companies are shown by the line graph provided below.

If the amounts invested in the companies, P and Q, in 2006 are in the ratio 8:9, then the amounts received after one year as interests from companies P and Q would be in the ratio:

Today, we consider Ashoka as a great ruler because of the copious evidence he left behind in the form of stone carved edicts. Historians tend to correlate greatness of a king at his time with the availability of evidence today. Which of the following can be logically inferred from the above sentences?

Fact 1: Humans are mammals.

Fact 2: Some humans are engineers.

Fact 3: Engineers build houses.

If the above statements are facts, which of the following can be logically inferred?

I. All mammals build houses.
II. Engineers are mammals.
III. Some humans are not engineers.

A square pyramid has a base perimeter x, and the slant height is half of the perimeter. What is the lateral surface area of the pyramid?

Ananth takes 6 hours and Bharath takes 4 hours to read a book. Both started reading copies of the book at the same time. After how many hours is the number of pages to be read by Ananth, twice that to be read by Bharath? Assume Ananth and Bharath read all the pages with constant pace.

Q. 1 – Q. 25 carry one mark each.

Different kinds of limbs, such as the wings of birds and bats, and the flippers of turtles, whales and dolphins, have the same underlying skeletal structure. This is an example of:

Forests with a high density of native conifer trees are found in:

Ozone layer depletion, since the 1970s, is primarily attributed to:

The evolution of the amniotic egg in reptiles allowed them to:

Which of the following phyla are most closely related to chordates ?

Limb lengths were measured for 50 individuals from a population of lizards and the sample variance was calculated to be 64 cm². The standard deviation for this sample is ______ cm.

(Use decimal notation, not fractions or percentage. Enter only the numerical value in the space provided)

Most terrestrial ecosystems have a pyramidal structure of standing biomass across trophic levels where biomass of producers > primary consumers > secondary consumers > tertiary consumers.

However, some aquatic ecosystems have an inverted pyramidal structure where the standing biomass of producers < primary consumers. An explanation for this is:

In an experiment, a PhD student found that the traits, flower colour and seed size, did not follow Mendel’s Law of Independent Assortment. A possible explanation for this observation is:

Which of the following invertebrates has the lowest gut length:body length ratio?

Allopatric speciation occurs when two populations diverge because of geographical separation. Rates of allopatric speciation are likely to be higher in:

For nearly 200 years, biogeographers have noted that the tropics have more terrestrial species than
temperate regions. Which of the following is NOT a plausible explanation for this pattern?

If the rate of non-synonymous substitution at a locus exceeds that of synonymous substitution, then:

There are N individuals in a haploid population. At a given locus, there are 2 alleles, AL1 and AL2. The number of copies of allele AL1 is Z1, and the number of copies of allele AL2 is Z2 in the population. What is the frequency of allele AL2?

According to Hamilton’s Rule, an altruistic act will spread in a population due to kin selection, when B/C > 1/r , where B is the benefit to the recipient, C is the cost to the actor and r is the genetic relatedness of the recipient to the actor. Given this relationship, a human may forego producing one of her own offspring to help her full sibling raise offspring, only if it results in at least ______ or more extra offspring produced by her sibling.

Which of the following is NOT a plant hormone?

Among foraging shore birds, feeding rates (F, number of prey items consumed in 5 minutes) decrease as the number of neighbours (N) increases as follows: F = 10 – 0.9N. The maximum feeding rate is  ________________. (Use decimal notation, not fractions or percentage)

Which of the following is NOT an adaptation to reduce the risk of predation?

Which of the following is NOT an example of an evolutionary arms race?

The Weber-Fechner law states that the magnitude of a perceived sensation increases as log10 of stimulus intensity. Let us assume a background stimulus level of 1 unit, which increases to 10 units in situation P and to 100 units in situation Q. The perceived sensation in situation Q is stronger than the sensation perceived in situation P by a factor of ______. (Use decimal notation, not fractions or percentage)

Monotremes are unique among mammals because they: