List of top Biology Questions

The disease root-knot of brinjal is caused by
The diagram represents the L.S. of monocot seed. Find out the correct combination of labelling
The diagram represents the reproductive organs of male cockroach. Choose the correct combination of labelling.
The cytokine barrier among these is
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