Multiple Choice QuestionsSome salient features and phyla of organisms are given below. Select the option which shows correct combination of organism, its phylum and salient features.
Cochineal insects have proved very useful for
rodents control
Parthenium control
cactus prevention
Eicchornia prevention
Select the option that correctly matches characteristic features with the group of three animals.
Skeleton ofspicules - Sycon, Adamsia, Spongilla
Excretion by flame cells - Taenia, Fasciola, Ancylostoma
Mouth contains radula - Dentalium, Octopus, Ophiura
Jointed appendages - Limulus, Apis, Laccifer
The formation of canal system in sponges is due to
reproduction
porous walls
folding of inner walls
gastro- vascular system
C.
folding of inner walls
Canal system is a system of passages connecting various cavities of the animal body as in sponges. It serves the function of food collection, respiration and excretion.
It has less number of cells and thin body wall initially. But when the system gets complicated, the number of flagellated cells increases and the force to draw water current increases. It results in more number of cells and thick body wall. Thick body wall is folded forming regularly arranged in-pushings and out-pushings leading to the formation of canals.
Benthoic animals are those, which
are deep dweller in sea
are floating (free) organisms
are submerged in sea
float on the sea surface
Assertion: Cephalisation is advantageous to an animal.
Reason: Cephalisation improves the appearance of an animal.
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 of the following waste products in grasshopper is not excreted and is used in other metabolic activities
Carbon dioxide
Water
Uric acid
Faeces
Assertion: The nymph of a cockroach undergoes moulting several times.
Reason: There is gradual metamorphosis in cockroach.
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.
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