Assertion : A mutual exchange of sperms occurs between two earthworms during mating.
Reason : Mature sperms and egg cells and nutritive fluid are deposited in cocoons produced by gland cells of clitellum.
If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false.
B.
If both assertion and reason are true but reason is not the correct explanation of assertion.
Earthworms are hermaphrodites or bisexual. Self- fertilization is not possible in earthworms because of the relative position of openings of male and female reproductive organs, hence cross fertilization takes place.
During mating, two worms attach themselves with their ventral surfaces and become opposed to each other in opposite direction in order to exchange packet of sperms called spermatophores.
Mature sperms and egg cells ad nutritive fluid are deposited in cocoons are produced by the gland cells of clitellum. Egg cells gets fertilized by the sperm cells within the cocoon and is later deposited in/ on the soil.
Assertion : Pharyngeal nephridia play a role in the conservation of water in the earthworm.
Reason : They help the earthworm in keeping the skin moist for cutaneous respiration.
If both assertion and reason are true and reason is the correct explanation of assertion
If both assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false.
The type of epithelial cells which line the inner surface of Fallopian tubes, bronchioles and small bronchi are known as
squamous epithelium
columnar epithelium
ciliated epithelium
cuboidal epithelium
Assertion : In cockroach respiratory gases directly comes in contact with the various organs of the body.
Reason : Cockroaches do not have respiratory pigment.
If both assertion and reason are true and reason is the correct explanation of assertion
If both assertion and reason are true but reason is not the correct explanation of assertion
If assertion is true but reason is false
If both assertion and reason are false
Which one feature is common to leech, cockroach and scorpion?
Nephridia
Ventral nerve cord
Cephalization
Antennae
Which one of the following groups of structures/ organs have similar function?
Typhlosole in earthworm, intestinal villi in rat and contractile vacuole in Amoeba.
Nephridia in earthworm, Malpighian tubules in cockroach and urinary tubules in rat
Antennae of cockroach, tympanum of frog and clitellum of earthworm
Incisors of rat, gizzard (proventriculus) cockroach and tube feet of starfish
The type of epithelial cells which line the inner surface of Fallopian tubes, bronchioles and bronchi are known as
squamous epithelium
ciliated epithelium
columnar epithelium
cubical epithelium
Microvilli of intestinal epithelium are similar in function with
typhlosole in earthworm
hepatic caecae in cockroach
intestinal caecum in earthworm
Malpighian tubules in coackroach
Assertion : Gap junctions perform cementing function to keep the neighbouring cells together.
Reason : Tight junctions facilitate the cells to communicate with each other by connecting the cytoplasm of adjoining cells, for rapid transfer of ions, small and big molecules, etc.
If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false
If both assertion and reason are false
