STD 12 - 3. reproductive health — NEET STD 11 Science — Question

Genotype of a Down's syndrome is

Which one of the following events is thought to be most closely related to the sliding process between the two types of filaments which bring about contraction of the fibril

Normal sleep-wake cycle in a human body is maintained by the secretion of:

Which characters for cell junctions are correct from given characters ?
(i) Three types of cell junctions are found in the epithelium and other tissues, these are called as tight, adhering and gap junctions.
(ii) Tight junctions help to stop substances from leaking across a tissue.
(iii) Adhering junctions perform cementing to keep neighbouring cells together.
(iv) Gap junctions facilitate the cells to communicate with each other
(v) Rapid transfer of ions, small molecules and sometimes big molecules takes place through adhering junctions.

Select the incorrectly matched pair from following

Condition of sex chromosomes in a male child of Down's syndrome will be

Assertion : The brain stem contains centres for controlling activities.
Reason : Brain stem is very sensitive

The liquid connective tissue contains no