Question

Ecdysis is seen in case of (a) Nereis (b) Pila (c) Sea urchin (d) Cockroach

Short answer

(d) Cockroach

Step-by-step solution

Understanding the Term

Firstly, we need to understand the term 'Ecdysis'. Ecdysis is the process of shedding old cuticle in arthropods. This process includes insects and other arthropods like cockroaches, spiders etc.

Identifying the Organisms

Now we should identify which organisms belong to the arthropod group. Here, Nereis is an Annelid, Pila is a Mollusk, Sea urchin is an Echinoderm, and Cockroach is an Arthropod.

Choosing the Correct Option

Since Cockroach is an Arthropod and the Ecdysis process is seen in Arthropods, the correct option is (d) Cockroach.

Key concepts

Arthropods

Arthropods are a diverse group of invertebrate animals that include insects, arachnids, crustaceans, and myriapods. They are characterized by their exoskeleton, a hard covering made primarily of chitin, segmented bodies, and jointed appendages. One of the most fascinating aspects of arthropod biology is their method of growth, which involves a process known as ecdysis, or molting.

During ecdysis, an arthropod outgrows its rigid exoskeleton and forms a new one. This biological process is crucial because it allows the arthropod to increase in size. A new, soft exoskeleton forms beneath the old one, and when it's time to molt, the old exoskeleton cracks and is shed. This can be a vulnerable time for the arthropod as it waits for the new exoskeleton to harden and provide protection.

Understanding the unique characteristics of arthropods, such as their exoskeleton and molting process, is essential for students studying biology, particularly if preparing for competitive exams like NEET, where knowledge of animal classifications and life processes can be tested.

Biological Process in Insects

Insects, a subgroup of arthropods, undergo several biological processes that are integral to their survival and development. One key process is ecdysis, also known simply as molting. Insects will molt multiple times throughout their life cycle, particularly during their growth phases.

Ecdysis begins with the release of ecdysone, a hormone that triggers the molting process. The insect then consumes a lot of food, which is necessary for the energy-intensive process of shedding the old exoskeleton and expanding the new one. After molting, the insect typically hides or retreats to avoid predation since it is vulnerable until the new exoskeleton hardens.

Ecdysis is not only about growth; it also plays a role in metamorphosis, where larvae transform into adults, as seen in butterflies and beetles. Students studying the complexities of insect life cycles will gain insight into the broader themes of adaptation and evolution within biology.

NEET Biology

NEET, the National Eligibility cum Entrance Test, is a significant pre-medical examination in India that includes a comprehensive section on biology. This section tests students on various topics, including the structural and functional aspects of plants and animals, ecology, and human welfare. A thorough understanding of complex biological processes like ecdysis—insects’ molting—and their relevance to particular groups of animals like arthropods becomes crucial for success in this competitive exam.

For instance, in the context of NEET biology, questions may encompass the classification of animals, where recognizing characteristics unique to arthropods could be essential for correct identification and classification. Understanding these processes and the groups they relate to can lead to a more in-depth knowledge of the subjects tested, ultimately aiding students in achieving a higher score on the examination.