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Gate Questions for Zoology likely to be asked for Gate 2014 is given here. Sample Questions given here will be helpful for all writing life sciences XL paper in Gate 2014. Model Question Papers with Answers for Zoology have been prepared affter evaluating previous years questions in Gate.


Trees in the equatorial region of earth supply oxygen into the atmosphere that sustains species 
living in distant polar regions. This relationship is called as 
(A) mutualism (B) symbiosis (C) commensalism (D) parasitism 

Seasonally breeding animals and birds measure the day length, i.e. photoperiod and use these 
measurements as predictive information to prepare themselves for breeding. Besides melatonin, 
which of the following hormones is involved in this biological process?
(A) Gonadotropin releasing hormone (B) Growth hormone (C) Thyroxine (D) Adrenocorticotropic hormone

Red-Green color blindness is an X-linked recessive disorder. In a population which is in the HardyWeinberg equilibrium, the incidence of occurrence of this in males is 1:1000. What will be the 
expected incidence of affected homozygous females?
(A) 1 in 1002000 (B) 1 in 2000000 (C) 1 in 1001000 (D) 1 in 1000000

Golgi apparatus is also termed as cellular post office, since it packages and transports cellular 
proteins across various organelles and outside the cell. In general, the Golgi is perinuclear in 
location and is closely associated with the endoplasmic reticulum. A chemical compound, 
Monensin inhibits all trafficking from Golgi. If Golgi is visualized by immunofluorescence 
microscopy after treatment with this compound, the Golgi will be
(A) absent (B) normal (C) swollen (D) fragmented 

The nerve impulse at the neuromuscular junction results in discharge of acetylcholine (Ach) from 
its vesicles into the synaptic cleft. Ach gets degraded by acetylcholine esterase and is present in 
which one of the following locations?
(A) Post synaptic membrane (B) Both pre and post – synaptic clefts
(C) Presynaptic membrane (D) Synaptic cleft 

Zygotic genes required for the formation of a group of adjacent segment in the developing 
Drosophila embryo is called
(A) Maternal gene (B) Pair rule gene (C) Homeotic gene (D) Gap gene 

Increasing estradiol (E2) hormone from ovarian follicles prior to ovulation has been hypothesized 
to play a critical role for induction of pheromones. These pheromones render females sexually 
receptive to males to facilitate mating. An investigator performs experiments in sheep in which 
females are gonadectomized, then treated with E2 or vehicle alone and allowed to breed. Which 
one of the findings listed below will validate the hypothesis that pheromones are induced by E2?
(A) Sexual receptivity is regained only in vehicle treated females.
(B) Sexual receptivity is regained only in E2 treated females
(C) Sexual receptivity was regained irrespective of E2 treatment
(D) Sexual receptivity is not regained by any treatment 

A typical receptor senses extracellular stimuli by virtue of its localization on plasma membrane. 
The receptor to which of the following ligands is an exception to this rule?
(A) g
(gamma)-amino butyric acid (B) Acetylcholine (C) Estrogen (D) Luteinizing hormone

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