Browse exam-wise, subject-wise, and country-wise MCQs with explanations.
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Damage to scales and skin weakens the body barrier. This can increase infection risk, osmotic imbalance, and injury.
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A shell provides physical protection for soft tissues. Withdrawal into the shell reduces exposure to predators and environmental stress.
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Keratin is a structural protein found in many vertebrate integumentary derivatives, including mammalian hair and reptilian scales.
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Feathers are important for insulation and flight surface. Losing many feathers can reduce thermal control or flight performance until new feathers develop.
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Cilia generate movement at the cellular level, while muscles act as tissues and organs. Both contribute to locomotion or movement of materials.
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Muscular systems are not required in unicellular or very small organisms. Protozoans and many cells move by cilia, flagella, pseudopodia, or cytoplasmic streaming.
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Posture is maintained by skeletal support plus continuous or reflex muscle activity. Bones alone cannot hold normal posture without muscular control.
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Some amphibians have strong regenerative ability, including limb regeneration. This involves coordinated growth, nerves, and tissues rather than simple wound closure.
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Vertebrate bone stores calcium salts and phosphate, which give hardness and structural strength. Mineral storage is an additional skeletal function.
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The femur is an internal bone of the vertebrate endoskeleton. Fish scales are external protective structures, not limb bones.
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Large terrestrial animals need strong support systems to resist gravity, maintain posture, and permit locomotion. Skeletons distribute mechanical loads across the body.
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Ciliary beating can move the whole organism or generate water currents for feeding and respiration. In small aquatic forms, this is an efficient non-muscular mechanism.
