The whole body is made up of a single cell (acellular organisation).
Body shape is irregular with many blunt pseudopodia.
Creamy white
Five pairs of gill slits are present laterally between the mouth and pectoral fins.
Body divided into head, neck, trunk, and elongated tail; covered with rough epidermal scales; triangular head with a cone-shaped snout; two pairs of pentadactyl limbs; protective coloration.
Forelimbs are modified into two wings for flying.
The neck is short but highly flexible, facilitating movement between the head and trunk.
Males have a small, cylindrical and muscular penis, and a pair of scrotal sacs containing testes.
Egg, larva, pupa encased in cocoon, and silkmoth.
Hydra reproduces vegetatively by budding, where bud-like structures branch out from the polyp and ultimately separate as young hydra.
Phylum – Chordata, Subphylum – Vertebrata, Class – Reptilia.
The body is covered with minute placoid scales that can be felt when skin is rubbed from tail to snout.
Fasciola has a leaf-like dorso-ventrally flattened body, a broader anterior part with a conical end, and a mouth surrounded by a muscular oral sucker.
The whole body is covered with overlapping cycloid dermal scales.
The Garden Lizard is an arboreal reptile commonly found among bushes, shrubs, and trees.
Every colony has a single queen bee.
19 pairs
A contractile vacuole and several food vacuoles are present.
The mouth is situated at the anterior end and is surrounded by three lips: one mid-dorsally and two ventrolaterally.
The oral surface is the lower surface where the mouth is situated centrally.
The nuptial pad helps in holding the females during mating.
Telson
Prawn (iv)
Queen, workers, and drones.
A cup-shaped anterior sucker is present.
Phylum – Chordata, Subphylum – Vertebrata, Class – Amphibia.
Phylum - Chordata, Subphylum - Vertebrata, Class - Aves.
Phylum – Chordata, Subphylum – Vertebrata, Class – Mammalia
Metameres
The abdomen is long and tapering.
Drones are larger than workers but smaller than queens.
300-500 eggs.
Head, thorax, and abdomen.
Body long (20 to 40 cm), cylindrical (5 to 6 mm diameter), no segmentation, pointed ends, and separate sexes.
The posterior end is ventrally curved and has a pair of penial spicules near the cloacal opening.
Phylum – Echinodermata, Class – Asteroidea.
Gill slits are used for respiration, allowing water to flow over the gills.
An adult rabbit is about 40 cm in length.
Workers are sterile females, queens are fertile females, and drones are males.
Three segments: prothorax, mesothorax, and metathorax.
Mulberry
Tube feet are special organs present in the ambulacral grooves that assist in movement and feeding.
Forelimbs are smaller than hindlimbs; forelimbs have four digits while hindlimbs have five clawless digits.
The outer boundary of the middle ear is covered by a membrane called the tympanic membrane.
The body is covered with hair, divisible into head, neck, trunk, and a small tail.
Antennules, antenna, chelate legs, and nonchelate legs
Ventrally in the first metamere called the peristomium.
The tail is elongated with a heterocercal caudal fin, meaning the upper and lower halves are of unequal size.
It closes the wide opening at the end of the last whorl of the shell.
A sting.
Each of the five anterior metameres bears a pair of eyes on the dorsal margin.
There are 17 pairs of ventro-laterally arranged nephridiopores.
Starfish can be identified by its star-shaped pentamerous structure.
The liver fluke is bisexual.
Prawn (iv)
The moth.
Phylum – Mollusca, Class – Gastropoda.
Female genital aperture is in the 14th segment and male genital aperture is in the 18th segment.
Phylum – Annelida, Class – Oligochaeta.
Males have a midventrally situated copulatory organ.
Phylum – Annelida, Class – Hirudinea.
The body, called polyp, is elongated and cylindrical with long, slender, and contractile tentacles that encircle the hypostome.
The acetabulum is a muscular ventral sucker located on the ventral surface, situated posterior to the oral sucker.
The mouth is a transverse opening near the tip of the snout, which has fleshy lips.
Scoliodon has an elongated, streamlined, dorsoventrally flattened body at the anterior end and laterally compressed at the posterior end.
The body measures up to 60 cm in length.
The tail is short, upwardly directed, and furry.
It is the thickened skin or body wall around segments 14th to 16th.
Phylum – Arthropoda, Class – Insecta
Hirudinea has 33 body segments.
It has a streamlined and laterally compressed body, grey or black on the dorsal side, and silvery on the ventral surface, reaching up to 1m in length.
Phylum – Aschelminthes, Class – Nematoda.
The body is divisible into head, trunk, and tail with a homocercal caudal fin.
The hindlimbs have four-clawed digits that help in perching and bear the weight of the body while standing.
Vibrissae are prominent and stiff hairs on the upper lip that are touch-sensitive (tactile).
Star fish (v)
Amoeba (i)
The body is divided into head, trunk, and tail.
Into head, thorax, and abdomen
A pair of large compound eyes, three small ocelli, and mouthparts.
Wings remain outstretched like the wings of an aeroplane
Leeches vary from 6 to 10 cm in length.
The abdomen consists of six segments, each with its own set of biramous appendages.
A deeply stained nucleus of almost round shape is present.
Starfish exhibit apparent radial symmetry.
Body narrow and elongated, about 150 mm in length and 3 to 5 mm in diameter, with a pointed anterior end and a slightly depressed or blunt posterior end.
Hydra (ii)
The skin is naked (without scales) and slimy due to the secretion of mucous glands.
Phylum - Chordata, Subphylum - Vertebrata, Super Class - Pisces, Class - Osteichthyes.
Eyes are very large, even larger than those of workers.
Males are smaller and have a curved tail, while females are larger and have a straight tail.
The body bears a number of unpaired and paired fins, including two dorsals, a lobed caudal, a median ventral fin, and paired pectoral and pelvic fins.
The anus is present on the dorsal side at the junction of the last metamere and the posterior sucker.
A median groove-like cloacal aperture is situated ventrally between the two pelvic fins.
Phylum – Chordata, Subphylum – Vertebrata, Superclass – Pisces, Class – Chondrichthyes.
The cephalothorax is covered by a thick and hard shield-like cover called the carapace.
Body covered with feathers; streamlined body; small round head with beak; nostrils, large eyes, and ear openings covered with feathers; movable eyelids and nictitating membrane.
15-20 mm
It keeps the body surface slimy and moist.
Pleopods or swimming legs
It inhabits shallow freshwater such as paddy fields and ponds.
A pair of compound eyes
Pollen-collecting baskets.
Prawns have a pair of stalked compound eyes at the anterior end of the cephalothorax.
The dorsal surface is darker than the ventral surface.
A crescentic mouth is present on the ventral surface of the head behind the tip, with several rows of sharp and backwardly pointed teeth on both upper and lower jaws.
Head, foot, visceral mass, and mantle.
They have abdominal segments that bear wax glands.
The body is divided into an anterior cephalothorax and a posterior abdomen.
The dorsal surface is dark green and the ventral surface is yellowish brown.
Prawns are usually orange-red in color, but the color can vary.
Secretion of mucus from the body wall.
Prawns usually measure between 20 and 30 cm in length.
