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What is the skeleton of poriferans made of?
Spicules or spongin fibres.
Spicules or spongin fibres.
See lessWhich of the following statements is incorrect?
In cockroaches, excretion occurs through Malpighian cells and in prawns it occurs through green glands.
In cockroaches, excretion occurs through Malpighian
See lesscells and in prawns it occurs through green glands.
Provide appropriate technical term for lateral appendages in aquatic annelids.
Parapodia are lateral, unjointed and paired appendages.
Parapodia are lateral, unjointed and paired appendages.
See lessName the animal which exhibits the phenomenon of bioluminescence. Mention the phylum to which it belongs.
Pleurobrachlia. phylum—Ctenophora.
Pleurobrachlia. phylum—Ctenophora.
See lessWrite the scientific name of roundworm.
Ascaris lumbricoides.
Ascaris lumbricoides.
See lessWhich one of the following statements is incorrect?
Fasciola (liver fluke) is an acoelomate, i.e., without coelom or body cavity.
Fasciola (liver fluke) is an acoelomate, i.e., without coelom or
body cavity.
See lessGiven below are types of cells present in some animals each one is specialised to perform a single function except
Interstitial cells are reserve cells in coelenterates. They are also called as totipotent cells and can be converted into any type of cells or into a full organism.
Interstitial cells are reserve cells in coelenterates. They are also
See lesscalled as totipotent cells and can be converted into any type of cells
or into a full organism.
Give an example of animal which exhibits alternation of generation.
Obelia, shows alternation of asexual and sexual phases in its life cycle.
Obelia, shows alternation of asexual and sexual phases in its life
See lesscycle.
Provide appropriate technical term
(a) Medusa (b) Cnidoblast
(a) Medusa
See less(b) Cnidoblast
Identify the animal in which adults exhibit radial symmetry and larvae exhibit bilateral symmetry.
In Echinodermata, the adults are radially symmetrical and larvae are bilaterally symmetrical.
In Echinodermata, the adults are radially symmetrical and larvae
See lessare bilaterally symmetrical.