List of top Biological Science Questions

In humans, the urea synthesis occurs in
Identify the ecological pyramid which is generally inverted in a marine ecosystem is
Which one of the following is an abiotic component of an ecosystem?
When energy flows from one trophic level to the other, then its quantity
Removal of toxic heavy metals from contaminated soils by using fungi is known as
Which deficiency in diet is responsible for accumulation of water in the body?
This vitamin is essential for the health of the eye.
Match the following characteristics with their respective animal Phyla.
Pseudocoelom
In the process of food preservation, the main purpose of refrigerating food is
Identify the CORRECT sequence of subphases given below in the prophase of Meiosis I.

In the following figure, the radius of the circle circumscribing the regular hexagon is 2 cm. The area of the shaded region is ............ cm\(^2\) (round off to 2 decimal places) 

Which of the following statements is/are TRUE for the function \( f(x) \) shown in the figure given below? 

In an experiment to examine the role of exopolymetric substances (EPS) on bacterial growth, a wild-type strain (S⁺) and a mutant strain deficient in EPS production (S⁻) were grown in monocultures as well as in co-culture (in equal proportion of S⁺ and S⁻). The CFU (colony forming units) of these cultures measured after 24 hours are shown in the following figure. 

Which one of the following phenomena best describes the interaction between the wild-type strain (S⁺) and mutant strain (S⁻)? 
 

Match the diseases in Group A with their corresponding causative microorganisms in Group B 

 

Match the metabolic pathways in Group A with corresponding enzymes in Group B 

 

Which one of the following matches is CORRECT between the microorganisms given in Group A with their requirement of oxygen in Group B? 

Which one of the following plots represents exponential growth? 

 

Water from a full cylindrical vessel of height \( h \) and of unknown diameter is completely emptied to precisely fill two cylindrical vessels of the same diameter \( d \) and heights \( h \) and \( 3h \). The diameter of the original vessel is ............ \( \times d \) (round off to 2 decimal places)
In a diploid population at Hardy-Weinberg equilibrium, the locus A has two alleles \( A_1 \) and \( A_2 \). If the frequency of \( A_1 A_1 \) genotype is 0.01, then the frequency of the allele \( A_2 \) is ............ (round off to 2 decimal places)
If \( x \), \( y \), and \( z \) are all positive and \( x + y + z = 9 \), the maximum value of \( xyz \) is ............
In the second-order reaction \( 2A \to B \), the initial concentration of A is 1.0 M and after 30 minutes, the concentration of A is 0.5 M. The rate constant of the reaction is ............ L/mol/h (round off to 2 decimal places)
The complete oxidation of one mole of palmitoyl CoA yields 23 moles of water and 16 moles of carbon dioxide. The amount of water that can be produced from 1 kg of tripalmitate is ............ mL (round off to 2 decimal places)
Evaluate the limit \( \lim_{x \to 1} \frac{x^2 - 1}{\sqrt{x} - 1} \)
The angle (in degrees) between the hour hand and the minute hand of a 12-hour clock showing 6:30 is ............ (round off to 1 decimal place)
A bacterial population in the log-phase grows from \( 4 \times 10^6 \) cells to \( 8.64 \times 10^6 \) cells in 20 minutes. The doubling time of the bacterium is ............ minutes (round off to 1 decimal place)