Multiple Choice QuestionsAssertion: Branchiostoma and Balanoglossus are bilaterally symmetrical and triploblastic animals.
Reason: They are exclusively marine and possess notochord.
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.
Assertion: Cephalisation is advantageous to an animal.
Reason: It improves the appearance of the 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.
Assertion: Blood in cockroach is colourless haemolymph with no respiratory pigment.
Reason: Respiration in cockroach occurs through diffusion in haemolymph.
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.
C.
If assertion is true but reason is false.
The colourless blood or haemolymph of cockroach has a clear plasma and numerous white corpuscles called haemocytes. Being devoid of any respiratory pigment, it does not serve for gaseous exchange. Its plasma contains about 70% water. Rest of it is composed of amino acids, uric acid, proteins, sugars, fats, and salts of sodium, potassium, calcium and magnesium. Transportation of these materials between different parts of body is the main function of haemolymph.
In all terrestrial insects, like cockroach, every tissue of body is in direct contact with atmospheric air for gaseous exchange. A complicated system of numerous shiny, transparent and branched air tubes or tracheae is found for this purpose in the haemocoel cavity. Atmospheric air enters into and escapes out from this system through ten pairs of slit-like apertures called stigmata or spiracles, located on lateral sides of body
Assertion : In Pleurobrachia, eight comb like ciliary plates called comb plates are present on the body that help in locomotion.
Reason : Pleurobrachia reproduces sexually and its life cycle includes cydippid larva.
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.
Stinging capsules (nematocysts) are found in
wasp and honeybee
scorpion and cobra
sea pen and sea fan
cactus and Venus flytrap
Choose the correct pair
Coconut, cucurbits - dioecious
Honeybee, Rotifers - parthenogenesis
Ornithorhyncus, Whale - viviparity
Frog, Peacock - external fertilisation
Select the incorrect statement.
Periplaneta has compound eyes.
Earthworm shows segmentation.
Ascaris shows sexual dimorphism.
Liver fluke has a complete alimentary canal
Refer the given figure of digestive system of earthworm and identify the part labelled X.
Intestinal caecae
Typhlosole
Gizzard
Pharynx.
Which of the following is correct regarding respiration in adult frog
In water- Skin, gills
On land - Skin, buccal cavity
In water- Skin, buccal cavity
On land- Skin, lungs, gills
One of the world's most poisonous fish toxins is released by
clown fish
eel fish
sword fish
puffer fish
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