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Which of the animal has tube within tube body plan?

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Sarah Oconnell

Published Feb 21, 2026

Which of the animal has tube within tube body plan?

The Tube-within-tube body plan is shown by the phylum Annelida. They are also known as ringed worms belonging to a large phylum with species including earthworms, ragworms, and leeches.

Also question is, which of the following has tube within the tube plan?

The Tube-within-a-tube Body Plan: Phylum Nematoda | Back to Top. The phylum Nematoda consists of several hundred thousand species of roundworms, shown in Figure 24.

Subsequently, question is, why nematodes are said to be tube within a tube? There are two contending names for the phylum of nematodes. The phrase tube-within-a-tube is a convenient way to think of nematode body structure, and also a term used to refer to a major trend in the evolution of triploblastic metazoa (Brusca and Brusca, 1990 Invertebrates).

Likewise, which animal does not have tube within tube body plan?

The tube in a tube body plan is referred to a fluid-filled cavity, present between the digestive tract and outer body of the organism. Leech does not show tube body plan. Thus, the correct answer is 'option C). Leech.

Which plan is present in roundworm?

Nematodaroundworms(Also: nematodes) Roundworms (nematodes) are bilaterally symmetrical, worm-like organisms that are surrounded by a strong, flexible noncellular layer called a cuticle. Their body plan is simple. The cuticle is secreted by and covers a layer of epidermal cells.

Which body plan is found in nematodes?

Answer: Tube within a tube of body plan is found in the phylum Nematoda. Explanation: Nematodes have a smooth, elongated and cylindrical body structure which is packed in a tough, elastic covering called cuticle.

Do Aschelminthes have tube within tube body plan?

Option (d) Porifera- they show aggregate plan i.e. they consist of clusters of cells. Aschelminthes are also called Nementhelminthes – means roundworms. Their body cavity is known as pseudocoelomate. A digestive canal is present in the body cavity for this reason it is known as tube-within-a-tube body plan.

In which Triploblastic animal Coelom is absent?

Platyhelminthes

Which exhibits concentric tube within a tube plan?

Annelida includes metamerically segmented animals with true coelom. They may be aquatic (marine and fresh water) or terrestrial. They exhibits concentric 'tube within tube' type body plan.

What is the symmetry of the worm?

bilateral symmetry

The blind sac body plan is the body plan where the there is a single opening of the digestive system. The tube-like digestive system starts with a single opening through which the food is taken inside and the digested food is expelled through the same opening.

Which animal does not show locomotion?

Sycon (Scypha) is a sponge and does not perform locomotion. It is a genus of calcareous sponges belonging to family- Scyettidae, Class-Calcaronea and phylum- Porifera.

Which is the largest phylum in animal?

phylum Arthropoda

What is cell aggregate body plan?

Hint:The cell aggregate plan is a type of body plan in which the body has cluster or aggregation of cells which are not organized into tissues or organs. In the blind sac plan, the body has a single cavity which functions as digestive tract and coelom both.

Which of the following animal has a long tube like body made of many segments?

Leeches

What is segmentation in zoology?

Segmentation is the serial repetition of similar organs, tissues, cell types or body cavities along the anterior-posterior (A-P) axis of bilaterally symmetric animals (bilaterians). You, like other vertebrates, are segmented — consider the skeleton, musculature and nervous system of your trunk.

What is the body plan of platyhelminthes?

The body plan of the flatworm is bilateral, with a head that leads—a plan that continues in most animals living today. The structure of this bilateral plan is ideal for an active hunter. Flatworms are the first animals to transmit signals from sensory receptors along nerve cells to the brain.

What is the life cycle of nematodes?

The life cycle of a plant-parasitic nematode has six stages: egg, four juvenile stages and adult. Male and female nematodes occur in most species, but reproduction without males is common, and some species are hermaphroditic (Afemales@ produce both sperm and eggs). Egg production by the individual completes the cycle.

Do nematodes need oxygen?

Roundworms do not breathe in the sense that vertebrates, such as humans and other mammals, do. Instead, roundworms (also known as nematodes) obtain the oxygen their bodies need through diffusion, a process of gas exchange commonly used among flatworms and earthworms as well.

Why are parasitic nematodes important?

Free- living nematodes are very important in maintaining the soil bio-dynamic system, especially in soil with low organic matter content, whereas PPNs feed on plants and reduce crop growth and yield efficiency.

Why do nematodes not have a circulatory system?

CO2 levels increase inside the nematode's body before diffusing to lower CO2 concentration levels on the outside of the body. This process means that nematodes don't need blood vessels or lungs; they can allow natural concentration gradients to exchange gasses for them.

Do nematodes have a excretory system?

Excretory system

In many marine nematodes, one or two unicellular 'renette glands' excrete salt through a pore on the underside of the animal, close to the pharynx. In most other nematodes, these specialized cells have been replaced by an organ consisting of two parallel ducts connected by a single transverse duct.

Is Cephalization present in nematoda?

While the nervous system of these animals is less centralized, associative learning still occurs. Snails, flatworms, and nematodes are examples of organisms with a lesser degree of cephalization.

What is the most external layer of the nematodes called?

The epidermis (skin) of a nematode is highly unusual; it is not composed of cells like other animals, but instead is a mass of cellular material and nuclei without separate membranes. This epidermis secretes a thick outer cuticle which is both tough and flexible.

Do nematodes have a Pseudocoelom?

Furthermore, the nematodes, or roundworms, possess a pseudocoelom and consist of both free-living and parasitic forms.

What organisms are Pseudocoelomates?

The pseudocoelomates include the nematodes, rotifers, gastrotrichs, and introverts. Some members of some other phyla are also, strictly speaking, pseudocoelomate. These four phyla of tiny body size (many species no larger than the bigger protozoans) are placed together in part because they…

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Which of the animal has tube within tube body plan?