STD 11 - 1. The living world — BIOLOGY STD 11 Science — Question

Carrier ions like Na facilitate the absorption of substances like:

An aminoacid under certain conditions have both positive and negative charges simultaneously in the same molecule. Such a form of aminoacid is called.

Which is a stress hormone? or the hormone produced during adverse environmental conditions is:

The joint between the femur and acetabulum is known as:

The cells of the quiescent centre are characterised by:

Match the following cell structure with its characteristic feature

(a) Tight junctions	(i) Cement neighbouring cells together to form sheet
(b) Adhering Junctions	(ii) Transmit information through chemical to another cells
(c) Gap junctions	(iii) Establish a barrier to prevent leakage of fluid across epithelial cells
(d) Synaptic junctions	(iv) Cytoplasmic channels to facilitate communication between adjacent cells

Select correct option from the following

The term antibiotic was first used by:

Schneiderian membrane is found in