List of top Biology Questions

In an adult human, how many bones are present as ear ossicles ?

In alcoholic fermentation, NAD+ is produced during the

In _________ aestivation, sepals or petals in a whorl just touch one another at the margins, without overlapping, as is found in _______ .

In a typical complete, bisexual and hypogynous flower the arrangement of floral whorls on the thalamus from the outermost to the innermost is

In a population per capita birth rate is $0.15$ and per capita death rate is $0.08$ during a unit time period. What is the value of $r$ (intrinsic rate of natural increase) for the given population ?

In a polymerase chain reaction, temperature required for the steps (i) Denaturation, (ii) Annealing and (iii) Extension are respectively

In a normal embryosac, the ploidy level of egg cell, polar nuclei, synergids and secondary nucleus is

In a mature dicot stem which has undergone secondary growth, youngest layer of secondary xylem is situated

In a healthy adult man, the smallest type of leucocytes are

In a $DNA$ molecule, the phosphate group is attached to carbon ____ of the sugar residue of its own nucleotide and carbon ____ of the sugar residue of the next nucleotide by____ bonds.

In a dorsiventral leaf, location of palisade tissue and phloem is respectively on the______ surfaces.

In a certain plant, yellow fruit colour $(Y)$ is dominant to green fruit colour $(y)$ and round shape $(R)$ is dominant to oval shape $(r)$. The two genes involved are located on different chromosomes. Which of the following is correct for the condition when plant $YyRr$ is back crossed with the double recessive parent ?

In a cell cycle the RNA synthesis needed in protein synthesis, occurs in

In $2005$, for each of the $14$ million people present in a country, $0.028$ were born and $0.008$ died during the year. Using exponential equation, the number of people present in $2015$ is predicted as

In $1953, S. L$. Miller created primitive earth conditions in the laboratory and gave experimental evidence for origin of first form of life from pre-existing non-living organic molecules. The primitive earth conditions created include

If the pressure potential is +0.16 megapascals (mPa) and the osmotic potential is -0.24 megapascals, then the water potential would be

If the leaves on the stem show distichous condition, the

If the carbon atoms fixed by producers already have passed through three species, the trophic level of the last species would be

If $N =$ population density at time $t$, then population density at time $t + 1$ can be written as $N_{t+1}=N_{t}+\left[\left(A+B\right)-\left(C+D\right)\right]$ Select the correct option for $A$, $B$, $C$ and $D$ in the above equation.

If Meselson and Stahl's experiment is continued for four generations in bacteria, the ratio of $^{15}N/^{15}N : ^{15}N/^{14}N :^{ 14}N/^{14}N$ containing $DNA$ in the fourth generation would be

If $DPD$ represents diffusion pressure deficit, $OP$ is the osmotic pressure and $TP$ is the turgor pressure, then which of the following equations is correct ?

If a tissue has at a given time $1024$ cells, how many cycles of mitosis had the original parental single cell undergone?

If a leaf cell of Agave has $x$ chromosomes then what will be the number of chromosomes in a cell of its bulbil?

If a genetic disease is transferred from a phenotypically normal but carrier female to only some of the male progeny, the disease is

If a double stranded $DNA$ has $20\%$ of cytosine, what will be the percentage of adenine in it?