Diversity in Living Organisms

Mushrooms, moulds, and yeast are all members of the fungal kingdom. Diatoms are single-celled algae with silica shells, belonging to kingdom Protista, not Fungi.

Periplasm is found in Gram negative bacteria. Gram negative bacteria have both a plasma membrane and an outer membrane separated by periplasm.

Camels have long eyelashes to protect eyes from sand, wide feet to walk on sand without sinking, and thick lips to eat thorny desert vegetation. They do NOT have thick fur - they actually have relatively short, coarse hair that allows heat release and prevents overheating in hot desert conditions.

This is the correct option. Coelenterates and flatworms use simple diffusion over their entire body surface for the exchange of gases. Earthworms use a moist cuticle for the exchange of gases. Aquatic arthropods like fish use special vascularised structures called gills for the exchange of gases.

Amoebae are protozoa that obtain nutrition by ingesting food particles - they are heterotrophic and non-photosynthetic. Mosses, algae, and ferns are all photosynthetic organisms containing chlorophyll.

Poriferans (commonly known as sponges) are named after their characteristic porous body structure with numerous pores (ostia) through which water enters and leaves. They lack true tissues or organs. Segmented bodies, motility, and scales are features of other animal groups.

Invertebrates are defined as animals that lack a vertebral column (backbone). This includes about 95% of animal species such as insects, worms, molluscs, and jellyfish. Vertebral column is the distinguishing feature of vertebrates (fish, amphibians, reptiles, birds, mammals).

Molluscs (snails, clams, oysters, octopus) are characterized by a soft body often protected by a hard calcareous shell. Poriferans have porous bodies, annelids are segmented worms, and arthropods have jointed appendages and exoskeleton (not shells).

Platyhelminthes (flatworms) are characterized by dorsoventrally flattened bodies, which is why they are called flatworms. They include planarians (free-living) and flukes/tapeworms (parasitic). Poriferans are sponges, molluscs have soft bodies (often with shells), and nematodes are cylindrical roundworms.

Earthworms are free-living annelids that inhabit soil and feed on organic matter. Tapeworms and liver flukes are parasitic flatworms (Platyhelminthes). Ascaris is a parasitic roundworm (Nematoda). Free-living means the organism is not dependent on a host for survival.

Annelids (segmented worms) have cylindrical bodies, segmented bodies (metameres), and bilateral symmetry - all are characteristic features. However, they inhabit diverse habitats including terrestrial (earthworms) and freshwater/freshwater environments. 'Aquatic habitat' is not a universal characteristic as many annelids like earthworms are terrestrial.

Star fish, Sea urchin, and Antedon (feather star) are all echinoderms characterized by radial symmetry, water vascular system, and spiny skin. Hydra is a cnidarian (related to jellyfish and corals) with tentacles and stinging cells (nematocysts), not an echinoderm.

Arthropods (arthro = jointed, pod = feet) are defined by jointed legs/appendages - a key characteristic of insects, arachnids, crustaceans, etc. Annelids have segmented bodies but unjointed parapodia. Molluscs have muscular feet (not jointed). Platyhelminthes are flatworms without legs.

Pisces (fish) respire through gills, not lungs. Gills are specialized organs that extract dissolved oxygen from water as it flows over them. A streamlined body reduces water resistance for efficient swimming, and scaly skin provides protection. Most fish are oviparous (egg-laying). The statement 'Respire through lungs' is incorrect for fish and identifies the non-characteristic feature.

Reptiles are ectothermic (cold-blooded) organisms that rely on external heat sources to regulate their body temperature. They cannot generate internal metabolic heat to maintain a constant temperature. Characteristics that DO define reptiles include: scaly skin (preventing water loss), oviparous reproduction (egg-laying), and pulmonary respiration (breathing through lungs). Being 'warm-blooded' is a characteristic of birds and mammals, not reptiles.