GENERAL HISTOLOGY

OESOPHAGUS STOMACH

ECHINODERMS

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
The removing and replacing of old exoskeleton is called
A
metamorphosis
B
replacement
C
molting
D
exoing
Explanation: 

Detailed explanation-1: -In arthropods, such as insects, arachnids and crustaceans, moulting is the shedding of the exoskeleton (which is often called its shell), typically to let the organism grow. This process is called ecdysis.

Detailed explanation-2: -When an insect gets too big for its exoskeleton, it sheds it. This process-known as molting-might sound matter-of-fact, but it’s not. Insects stop eating, many lie still, and they become more vulnerable to predators. Now, a study of mayfly larvae has revealed another difficulty: While molting, insects can’t breathe.

Detailed explanation-3: -Molting is the shedding of the exoskeleton (cuticle) of the previous life stage. Without molting, an insect cannot grow. Once a new cuticle is fully formed, an insect engages in species-specific stereotyped patterns of movements (molting behaviors) that liberate it from the cuticle of the previous stage.

Detailed explanation-4: -Ecdysis is the process of an arthropod moulting its exoskeleton. Moulting is necessary as the arthropod exoskeleton is inflexible and so, to grow larger, arthropods must moult. Moulting is a critical but vulnerable time for arthropods.

Detailed explanation-5: -Arthropods shed their exoskeletons as they grow, a process called ecdysis or moulting, and this behaviour is controlled by a set of hormones and small protein-like molecules called neuropeptides that allow communication between neurons.

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