STD 11 - 15. Body fluids and criculations — NEET STD 11 Science — Question

Haversian system is found in

Choanocytes perform

The heart beat increases at the time of interview due to

During muscle contraction

Apart from mammals, other group of animals maintaining a high and constant body temperature is

Random unidirectional change in allele frequencies that occurs by chance in all populations and especially in small populations is known as

A steroid hormone which regulates glucose metabolism is

Select the correct match :

(A) 1869	I. Friedrich meischer
(B) 1953	II. Watson and crick
(C) 1928	III. Griffith
(D) 1952	IV. Hershey and chase

Choose correct option for given statements :
(i) Secondary or anamnestic response produces in subsequent encounter with the same pathogen, elicits a highly intensified response.
(ii) In our body, memory cell appears in blood during primary response.
(iii) The primary and secondary immune responses are carried out with the help of B-lymphocytes and T-lymphocytes.
(iv) The B-lymphocytes produce antibodies.
(v) The T-cells help B-cells in production of antibodies.
(vi) The cell-mediated immune response is responsible for the graft rejection.

The spark-discharge apparatus to test chemical evolution of life was designed by