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How are canals in canal system connect spongocoel to the outside? What is the role of choanocytes in maintaining water flow?
The canals connect the spongocoel to the outside through ostia. The canals are generally lined by choanocytes. The continuous beating of flagella of choanocytes maintain a steady current of water through the canals.
The canals connect the spongocoel to the outside
See lessthrough ostia. The canals are generally lined by
choanocytes. The continuous beating of flagella of
choanocytes maintain a steady current of water through
the canals.
Why Peripatus is called a connecting link between annelids and arthropods?
Annelid characters Peripatus have jointed parapodia (legs) nephridia for excretion and simple gut. Arthropod characters Peripatus have claws on the legs, haemocoel, trachae for respiration and head with a pair of compound eyes and antennae.
Annelid characters Peripatus have jointed parapodia
See less(legs) nephridia for excretion and simple gut.
Arthropod characters Peripatus have claws on the
legs, haemocoel, trachae for respiration and head with a
pair of compound eyes and antennae.
Sponges are filter feeders. How does it take place?
The tiny food particles are strained out of the water current by the choanocytes which pass them on to the other cells. These cells ingest food particles and digestion is intracellular. Planktons are the important food source for the filter feeders such as sponges.
The tiny food particles are strained out of the water
See lesscurrent by the choanocytes which pass them on to the
other cells. These cells ingest food particles and
digestion is intracellular. Planktons are the important
food source for the filter feeders such as sponges.
Provide the appropriate technical term for blood-filled cavity in arthropods and lateral appendages in aquatic annelids.
Blood-filled cavity in arthropods is haemocoel and lateral appendages in aquatic annelids are parapodia.
Blood-filled cavity in arthropods is haemocoel and
See lesslateral appendages in aquatic annelids are parapodia.
Name a molluscs which has an internal shell and which does not have a shell?
Internal shell— In Sepia (cuttle fish), Loligo (squid) Shell absent— Octopus (devil fish).
Internal shell— In Sepia (cuttle fish), Loligo (squid)
See lessShell absent— Octopus (devil fish).
Name the types of zooids present in coelenterates. What is this phenomenon called?
Cnidarians have basically two types of zooids, i.e., polyp (cup-shaped) and medusa (umbrella-shaped). This phenomenon is called polymorphism (metagenesis).
Cnidarians have basically two types of zooids, i.e., polyp
See less(cup-shaped) and medusa (umbrella-shaped). This
phenomenon is called polymorphism (metagenesis).
Name the respiratory organs of these arthropods.
(i) Prawn-gills (ii) Cockroach—trachea (iii) Scorpion and spider—book lungs (iv) King crab-book gills
(i) Prawn-gills
See less(ii) Cockroach—trachea
(iii) Scorpion and spider—book lungs
(iv) King crab-book gills
Which is the first group of animals that have endocrine system? How pheromones work in insects?
Arthropods are the first animals evolved the endocnne system. Some insects release pheromones that act as attractants by which males can locate females even if it is present far away from them.
Arthropods are the first animals evolved the endocnne
See lesssystem. Some insects release pheromones that act as
attractants by which males can locate females even if it
is present far away from them.
Define the terms amphids and phasmids found in Aschelminthes.
Amphids are pits commonly having olfactory chemoreceptors. Phasmids are glandulo-secretory porous sensory structures.
Amphids are pits commonly having olfactory
See lesschemoreceptors.
Phasmids are glandulo-secretory porous sensory
structures.
What is hydrostatic skeleton?
Hydrostatic skeleton is a system of water-filled spaces that act as turgor operated chambers or valve for movements and pressure points.
Hydrostatic skeleton is a system of water-filled spaces
See lessthat act as turgor operated chambers or valve for
movements and pressure points.