Animal kingdom practice · Medium

Option D is correct because the assertion is false (digestion is both intra and extracellular in ctenophores), but the reason is true (ctenophores are diploblastic).

Option B (Earthworm) is correct because earthworms do not undergo metamorphosis; they develop directly from juvenile to adult form.

Option B (Pedicellaria) is correct because pedicellariae are characteristic of Echinodermata, not Mollusca. Mollusca possess a heart, ctenidia (gills), and a mantle.

Option D (The presence of well developed skull) is correct because all vertebrates, without exception, possess a well-developed skull (cranium) that protects the brain.

Option A is correct because both statements are true: Cnidarians have a gastrovascular cavity, and it opens through the mouth on the hypostome.

Option B is correct because Aranea (spiders) belong to the class Arachnida, not Insecta.

Option A is correct because the water vascular system in echinoderms is primarily involved in locomotion, respiration, and transport of nutrients and waste.

Option D is correct because Aplysia is commonly known as the Sea Hare, not the Sea Mouse. The Sea Mouse is a type of marine worm (Aphrodita).

Option A (Hirudinea) is correct because botryoidal tissue, a type of connective tissue, is found in leeches (Hirudinea).

Option C (Cyclostomata) is correct because jawless fishes are classified under the class Cyclostomata.

Option B (Ascaris, Leech, Earthworm- Eucoelomate Exception – Ascaris) is the correct match because Ascaris is a pseudocoelomate, while leech and earthworm are eucoelomates.

Option B (161) is correct because tube feet are the locomotory organs of Echinodermata, and 161 represents Echinodermata in the options.

The correct answer is C (Mollusca) because the combination of moist skin, complete digestive tract, ventral nerve cord, and torsion is characteristic of this phylum.

Option B (Statement-1 is true, statement-2 is false) is correct because nematodes have a pseudocoelom, but it is not lined by mesoderm.

Option D (Absence of body cavity) is correct because Platyhelminthes are acoelomates, lacking a body cavity, while annelids are coelomates.

Option D (Sponges) is correct because collar cells (choanocytes) are unique and characteristic cells found in sponges.

Option B (Urochordata) is correct because retrogressive metamorphosis, where the larva has more advanced features than the adult, is found in Urochordata.

Option C (Clarias, Betta) is correct because both Clarias (walking catfish) and Betta (Siamese fighting fish) possess an operculum, an air bladder, undergo external fertilization, and are oviparous.

Option D (Poikilothermy) is correct because both Pisces (fish) and Amphibia are ectothermic or poikilothermic, meaning their body temperature varies with the environment.

Option D (1 and 2) is correct because the absence of neurons and sensory cells prevents the formation of tissues and organs in Porifera.

Option D (None of the above) is correct because all the snakes listed in options A, B, and C contain at least one poisonous snake.

Option B (Both A and R are true but reason is not correct explanation of assertion) is correct because Platyhelminthes are indeed dorso-ventrally flattened, and Planaria have high regeneration capacity, but regeneration isn't the reason for their flattened body shape.

Option B (Mantle) is correct because the shell of molluscs is secreted by the mantle, a specialized layer of tissue covering the visceral mass.

Option C (Fishes and amphibians) is correct because anamniotes are animals whose embryos do not develop an amnion; this group includes fishes and amphibians.

Option B (Longitudinal and circular muscles) is correct because Annelids use these muscles for movement, contracting against their hydrostatic skeleton.

Option C is correct because the syrinx is the sound-producing organ found in birds, located at the junction of the trachea and bronchi.

Option C (Calotes) is correct because Calotes (garden lizard) is mostly terrestrial, has dry and cornified skin with epidermal scales, a three-chambered heart, and internal fertilization.

Option D (Post anal tail is present in adult stage also, in some chordates) is correct because while not all adult chordates retain a post-anal tail, some do.

Option A is correct because in Insecta, the body is divided into head, thorax, and abdomen.

Option A (Both A and R are true and the reason is correct explanation of assertion) is correct because the water vascular system is unique to echinoderms and it functions in locomotion, food capture, transport, and respiration.