CBSE
Multiple Choice QuestionsA frog has its brain crushed. But when pinched on the leg, The leg draws away. It is an example of
neurotransmitter incluced response
simple reflex
conditioned reflex
automated motor response
In cockroach, the arthrodial membrane
forms the hind wings
covers the compound eyes
forms the hypopharynx
forms the tegmina
forms the tegmina
Which of the following scientists discovered the triple helical structure of collagen?
G.N. Ramachandran
Anton von Leeuwenhoek
Matthias Schleiden
Theodor Schwann
Theodor Schwann
Which one of the following is not a sensory structure in cockroach?
Antennae
Eyes
Anal cerci
Maxillary palps
Maxillary palps
Choose the wrong statement regarding the circulatory system of frog
Sinus venosus receives blood through major veins called vena cava
The ventricle opens into a sac like conus arteriosus
The erythrocytes are nucleated
Special venous connection between liver and intestine called renal portal system is present
Special venous connection between liver and intestine called renal portal system is present
Read the following statements and choose the correct answer.
i. Gap junctions cement adjacent cells together
ii. Areolar tissue contains fibroblasts, macrophages and mast cells
iii. Tight junctions facilitate the cells to communicate with each other
iv. Adhering junctions help to stop substances from leaking across tissues
v. Cells of connective tissue except blood secrete fibres of structural proteins called elastin
i, ii and iii only are wrong
i, iii and iv only are wrong
iii and v only are wrong
i, ii and v only are wrong
i, ii and v only are wrong
Non-cellular layer that connects inner surface of the epithelial tissue to the connective tissue is
basement membrane
epidermis
dermis
either (b) or (c).
Tadpoles can be made to grow in size and become adult by
injecting thyroxine hormone
feeding the eggs of other frogs
injecting gonadotrophic hormones
providing them with suitable climatic conditions
Choose the wrongly matched pair regarding the position of
reproductive structures in earthworm
Testes - 10th and 11th segments
Spermathecae - 6th to 9th segments
Male genital pore - 9th segment
Ovaries - Inter segmental septum of 12th and 13th segments
Ovaries - Inter segmental septum of 12th and 13th segments
The ganglia of sympathetic and the central nervous system in frog develops from the
neural cell
neural plate cells
notochordal cells
neural crest cells
