List of top Biology Questions

Ozone depletion is occurring widely in

Oxysomes or $F_0 - F_1$ particles occur on

Osmosis cannot be demostrated by a potato osmoscope using a solution of NaCl instead of sugar, because the potato tissue is

Osmosis means movement of

Ornithine cycle was discovered by

Organisms reproducing throughout the year are called ________ breeders e.g., ________, and those who show recurring sexual activity are called _______ breeders e.g., ________.

Organic farming includes

Optimum temperature conditions for photosynthesis in $C_{3}$ and $C_{4}$ plants are respectively

Open circulatory system is present in $(i)$ and $(ii)$. Fill the correct option for $(i)$ and $(ii)$.

One of the most resistant biological material present in the exine of pollen grain is

One of the following is true with respect to $AUG$

One of the following is not the causal organism for ringworm,

Offsprings of oviparous animals are at greater risk of survival as compared to those of viviparous animals because

Of the total nephrons, juxtamedullary nephrons constitute

Oestrous cycle is reported in

Oestrus cycle is found in

Number of comb plates present in comb jellies is

Number of joints present over anal styles of Cockroach is

Normal range of urea in 100ml of human blood is

Now-a-days India is under which stage of demographic cycle ?

Nucellus of an ovule is equivalent to a

Nitrogen and hydrogen combine to form ammonia under high temperature and pressure conditions. This is an example of

Nitrates are converted into Nitrogen by

Nervous tissue is made up of neurons and neuroglial cells. Which of the following statements about these two cells is/are false? (i) Neuroglia make up more than one-half the volume of neural tissue in our body (ii) Neuroglia protect and support neurons (iii) When a neuron is suitably stimulated, an electrical disturbance is generated which swiftly travels along its cytosol (iv) Arrival of the disturbance at the neuron's endings triggers stimulation or inhibition of adjacent neurons or other cells

Neck canal cells are absent in archegonia of -