List of top Biology Questions

The condition where urea accumulates in blood is:

The chromosomal number in the meiocytes of housefly is:

The cavities of alveoli of lungs are lined by

The cell organelle associated with intracellular digestion of macromolecules is

The brain capacity of Homo erectus was about:

The behaviour of the chromosomes was parallel to the behaviour of genes during meiosis was noted by

The average quantity of urea excreted in urine by man per day is:

The back flow of faecal matter in the large intestine is prevented by the presence of:

The ?amino acid derivative? among the following hormone is:

Tendons, which attach one bone to another bone are made up of

Sphincter of Oddi guards

Spermathecae in Pheretima is located in the segments:

Read the statements regarding structure of polynucleotide chain and choose the correct option. 1. $\quad$A nitrogenous base is linked to the pentose sugar through a$\quad$$\quad$ $\quad$$\quad$phospho-diester linkage. 2. $\quad$Two nucleotides are linked through 3'-5' N-glycosidic linkage to $\quad$$\quad$form a dinucleotide. 3. $\quad$The polynucleotide backbone is formed by sugar and phosphate. 4.$\quad$ A phosphate group is linked to 5'-OH of a nucleoside through a N-$\quad$$\quad$glycosidic linkage to form a nucleotide.

Read the statements regarding frog and choose the correct option. 1. $\quad$The frog never drinks water but absorbs water through its skin. 2. $\quad$The hindlimbs of frog ends in four digits. 3.$\quad$ Male frogs have vocal sacs. 4. $\quad$Male frogs have a copulatory pad on the second digit of the$\quad$$\quad$forelimb. 5. $\quad$Frogs have bilobed tongue.

Read the following statements and identify the correct option given (a) $\quad$Sap vacuoles ............. contain digestive enzymes with the help of $\quad$$\quad$which nutrients are digested (b) $\quad$Contractile vacuoles .............. take part in osmoregulation and $\quad$$\quad$excretion (c)$\quad$ Food vacuoles ............. store and concentrate mineral salts as $\quad$$\quad$well as nutrients (d) $\quad$Air vacuoles ............. store metabolic gases and help in $\quad$$\quad$buoyancy of cells

Pneumotaxic centre which can moderate the functions of the respiratory rhythm centre is present at:

Proboscis gland in Balanoglossus is associated with:

Proliferation of endometrium of uterus is controlled by

Necrosis, or death of tissue particularly leaf tissue, is due to the deficiency of:

Incomplete double circulation is seen in

In XO type of sex determination

In which of these would you find white fibrous tissue in abundance

In the immune system, interferons are a part of:

In the male reproductive system of cockroach, a, b, c, d and e represents.

In the double-helical structure of DNA, the pitch of the helix is