Problem 62 - Objective Biology for NEET

Question

Coelenterates asexually reproduce by (a) Budding (b) Gametes (c) Conidia (d) Gemmules

Step-by-Step Solution

Answer

Coelenterates reproduce asexually by (a) Budding

Step 1: Determine the Reproduction Procedures

First, it is necessary to understand the different options mentioned. Budding is a form of asexual reproduction that results from the outgrowth of a part of a cell or body region leading to a separation from the original organism into two individuals. Gametes are cells used during sexual reproduction. Conidia are a type of spore produced by various types of fungi and not applicable to Coelenterates organisms. Gemmules are a form of asexual reproduction in sponges.

Step 2: Connect the Reproduction Procedure to the Coelenterates

Coelenterates, such as jellyfish and corals, are known to use asexual reproduction by a process known as budding. Therefore, we can conclude that coelenterates reproduce asexually by budding.

Step 3: Conclusion

Given the information about reproduction procedures and knowledge of coelenterates, the solution to this question is (a) Budding since it's a method coelenterates use for asexual reproduction.

Key Concepts

Budding

Budding is a fascinating process of asexual reproduction, commonly seen in certain types of organisms, including coelenterates. This simple, yet effective way of reproduction occurs when a new organism develops from a part of the parent organism. The new growth, referred to as a 'bud', forms as an outgrowth. It gradually develops into a new individual, either detaching to live independently or remaining attached to form aggregates.
Budding is remarkable because it does not require the fusion of gametes, which is the hallmark of sexual reproduction. Instead, the bud is a genetic clone of the parent, inheriting all its characteristics.

• This leads to rapid population growth.
• It enables organisms to quickly adapt to their environment, as successful generational traits are passed on unchanged.
• The whole process is energetically efficient, using minimal resources.

In the case of coelenterates, budding is a primary means of reproduction, which highlights its central role in their life cycles.

Coelenterates

Coelenterates, often referred to as cnidarians, are a simple yet diverse group of animals. They include familiar creatures like jellyfish, hydras, and corals. These animals are predominantly aquatic and are known for their distinctive radial symmetry, which is quite different from the bilateral symmetry seen in most other animals.
A key characteristic of coelenterates is their cnidocytes – specialized cells that they use for capturing prey.

• They have a simple body plan, which includes only two layers of cells – the epidermis and the gastrodermis.
• This structure is supported by a jelly-like substance called mesoglea.
• They have a single opening that serves both as a mouth and an anus.

The simplicity of their body structure has no bearing on their ecological success; they thrive in a wide range of environmental conditions. A critical aspect of their life cycle is reproduction, both sexual and asexual, which allows them to maintain their populations effectively.

Reproduction Methods

When discussing reproduction methods, it is important to understand the difference between sexual and asexual reproduction. While sexual reproduction involves the fusion of gametes (sperm and egg), asexual reproduction does not. For many simple organisms like coelenterates, asexual reproduction is a vital process.

• Asexual reproduction allows for rapid population increase without the need for a mate.
• One primary method is budding, where a new individual grows directly from the body of the parent.
• Other forms include binary fission and fragmentation.

In coelenterates, budding is especially prominent as it allows these organisms to spread rapidly within their environment. The ease and speed of asexual reproduction contribute significantly to their ability to survive and adapt across various habitats.
While other methods like gamete fusion do occur, they are not the dominant form of reproduction in many coelenterates. Understanding these processes helps appreciate how these simple organisms manage to thrive in diverse ecosystems.