List of top Biology Questions

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?
If $2n = 4$, then identify the figures $A, B$ and $C$, as per the following codes and select the correct option.
Anaphase of meiosis 1 = (i) Anaphase of mitosis = (ii) Anaphase meiosis II =(iii)
Identify the wrong statement about meiosis.
Identify the type of vascular bundle as shown in the figure and select the incorrect statement regarding it.
Identify the plants (from the list $i - vi$) which possess the given type of guard cells (as shown in the diagram) in their leaves.
(i) Grass (ii) Tomato (iii) Banana (iv) Brinjal (v) Soybean (vi) Lily
Identify the simple tissue from the following.
Identify the parts marked as $A , B$ and $C$ in the given figure showing $ATP$ synthesis through chemiosmosis.
Identify the parts labelled as $A, B, C$ and $D$ in the given figure and select the correct option from the given codes.
Identify the parts labelled as $A$, $B$, $C$, $D$ and $E$ in the given diagram of a human sperm and select the correct option.
Identify the labelled parts $A-D$ in the given figure of human foetus within the uterus.
Identify the labels $A, B, C$ and $D$ in the given structure of $tRNA$ and select the correct option.
Identify the given vegetative propagule.
Identify the figures and choose the correct option.
Identify the given figures $A, B$ and $C$ and select the correct option.
Identify the different types of aestivation ($A$, $B$, $C$ and $D$) and select the correct option.
Identify the different parts of a typical dicot embryo labelled as $A, B$ and $C$ and select the correct option.
Identify the correct statement from the following.
Identify the correct sequence of events in Kreb?? cycle.
Identify the correct and incorrect statements from the following. (I) 17500 new cells are produced per hour by a single maize root apical meristem. (II) With the help of length, growth of pollen tube is measured. (III) The growth of the leaf is measured in term of volume. (IV) Cells in a watermelon may increase in size by upto 350000 times.
Identify $P$, $Q$, $R$ and $S$ in the given diagram of electron transport system.