List of top Questions asked in GATE XL

Correctly match the following Arabidopsis genes (Group I) and the biological processes they primarily regulate (Group II):

Correctly match the economically important specialized metabolites (Group I) with their broad chemical classes (Group II):

The following table summarizes the flowering time behavior (days to flower) and the transcript levels in four genotypes of a plant species.

Which one of the following genetic pathways best explains the observations shown in the table?
 

Correctly match the photosynthetic pathways (Group I) with their first stable products (Group II) in respective plants (Group III):

In the history of photosynthetic research, the empirical reaction of photosynthesis was first proposed for green plants (equation 1), followed by another reaction for purple sulfur bacteria (equation 2), leading to a generalized equation for photosynthesis (equation 3), where \( {H}_2{A} \) in equation 3 is a generalized electron donor.
\[ {CO}_2 + {H}_2{O} \xrightarrow{{light}} {(CH}_2{O)} + {O}_2 \quad {(equation 1)} \] \[ {CO}_2 + 2{H}_2{S} \xrightarrow{{light}} {(CH}_2{O)} + {H}_2{O} + 2{S} \quad {(equation 2)} \] \[ {CO}_2 + 2{H}_2{A} \xrightarrow{{light}} {(CH}_2{O)} + {H}_2{O} + 2{A} \quad {(equation 3)} \] Where \( {H}_2{A} \) in equation 3 is a generalized electron donor. Which one of the following statements is DISPROVEN by equation 3?
 

If an egg cell of a diploid plant species has 10 chromosomes, the expected number of chromosomes in a double trisomic somatic cell of this species would be ............. (Answer in integer).

Correctly match the carnivorous plants (Group I) with the organs (Group II) they modify to trap the prey:

Correctly match the names of the plant taxonomists (Group I) with the titles of the books they authored (Group II):

The DNA double helix measures 0.34 nm/bp. The diameter of a nucleosome core particle is 11 nm. If the ratio of wrapped DNA length to nucleosome diameter is 4.51, the length of DNA around the nucleosome (to the nearest integer) is ...... bp.

Phospholipid vesicles prepared in 50 mM KCl were diluted in water. Based on this information, statements P and Q are made.
P: The diluted vesicles will develop membrane potential.
Q: There is a K+ concentration difference across the vesicular membrane.
Which one of the following options is correct?
 

Which one of the following ion channels opens to repolarize the neuronal membrane when an action potential is generated?
The CORRECT statement(s) regarding biomolecules is(are):

Addition of a few drops of concentrated HCl to an aqueous solution of CoCl₂ forms a dark blue complex X.
The CORRECT statement(s) for this reaction is(are):
(Given: Atomic number of Co: 27)
 

The CORRECT statement(s) for the given reactions is(are):

For product formation from only one type of reactant (e.g. A \(\rightarrow\) product), the CORRECT match for the order of the reaction (given in Column I) with the half-life expression (given in Column II) is:
(\([A]_0 \) is the initial concentration and \( k_r \) is the rate constant)

A few species are given in Column I. Column II contains the hybrid orbitals used by the central atom of the species for bonding.
The CORRECT match for the species to their central atom hybridization is:
(Given: Atomic numbers of B: 5; C: 6; O: 8; F: 9; P: 15; Cl: 17; I: 53)

The CORRECT statement(s) about \([Ni(CN)_4]^{2-}\), \([Ni(CO)_4]\) and \([NiCl_4]^{2-}\) is(are):
(Given: Atomic number of Ni = 28)

The CORRECT statement(s) regarding the given molecules is(are): 

The isothermal expansion of one mole of an ideal gas from \( V_i \) to \( V_f \) at temperature \( T \) occurs in two ways:
Path I: a reversible isothermal expansion;
Path II: free expansion against zero external pressure.
The CORRECT option for the values of \( \Delta U \), \( q \), and \( w \) for Path I and Path II is:
The standard enthalpy of the reaction, \[ \text{C (graphite)} + \text{H}_2\text{O (g)} \rightarrow \text{CO (g)} + \text{H}_2\text{ (g)} \text{ is found to be } +131.3 \, \text{kJ mol}^{-1} \] and the \( \Delta_f H^\circ \) value for CO (g) is -110.5 kJ mol−1.
The value of \( \Delta_f H^\circ \) (in kJ mol−1) for H2O (g) is:

The rate of solvolysis for the following tertiary halides in 80% aqueous ethanol at 25°C follows the order:

In a typical grinding operation, 80% of the feed material passes through a sieve opening of 4.75 mm; whereas, 80% of the ground product passes through 0.5 mm opening. If the power required to grind 2 tonnes/h of the feed material is 3.8 kW, the work index of the material is ........ (rounded off to 2 decimal places)
The true density and bulk density of wheat grains are 1280 kg/m\(^3\) and 740 kg/m\(^3\), respectively. The porosity of the grains is ......... (rounded off to 2 decimal places).
Identify the gas composition (in percent) suitable for packaging cured meat under MAP conditions.
Which of the following sequence of events occurs during the formation of egg-white gel?