STD 11 - 7. Structural organisation in animal — NEET STD 11 Science — Question

Which one of the following is a distinctive character of Class Bivalvia of the phylum Mollusca?

Given statements are characters of muscle, which of the following is correct for cardiac muscles ?
(i) They do not exhibit any striation and are smooth in appearance. Hence, they are called non- striated muscle.
(ii) They have a striped appearance under the microscope and hence are called striated muscles.
(iii) As their activities are under the voluntary control of the nervous system, they are known as voluntary muscles.
(iv) Their activities are not under the voluntary control of the nervous system and are therefore known as involuntary muscles.
(v) They are located in the inner walls of hollow visceral organs of the body like the alimentary canal, reproductive tract, etc.
(vi) They are primarily involved in locomotory actions and changes of body postures.
(vii) Many muscle cells assemble in a branching pattern to form a muscle.

A bundle of muscle fibre is called

Main source of amoebic dysentery is

The joint between the lower jaw and the skull is

In which of the following very simple neural organization is found ?

Which one is a hereditary trait

‘Second line of defence' is known as

It is not a function of bone.

Infection of Ascaris usually occurs by