Question

Ascaris is
A.Radially Symmetric
B. Bilaterally symmetrical
C. Asymmetrical
D. None of the above

Answer 1

Hint:Ascaris is a genus of parasitic nematode worms. It is also known as 'small intestinal roundworms', belonging to the phylum Helminths. All nematodes are shown bilateral symmetry with the head being radially symmetrical, pseudocoelomate.

Complete answer:
Ascaris, hookworm, and whipworm are parasitic worms referred to as soil-transmitted helminths (STH). Together, they cause a major burden of parasitic disease worldwide known as Ascariasis.

Bilaterally symmetrical: The symmetrical arrangement, as of an organism or a body part, along a central axis, so that the body is divided into equivalent right and left halves by only one plane. Roundworms (nematodes) like Ascaris are worm-like organisms that are surrounded by a strong, flexible noncellular layer called a cuticle. They have a simple body plan and are bilaterally symmetrical.

Lets know about other options-
Option A- Radially Symmetric: Radial symmetry is an asymmetry in which each side exhibits correspondence or regularity to each other of parts around a central axis. It lacks the left and right sides. It is in contrast to bilateral symmetry, it is more common than radial symmetry.

Option B -Bilaterally symmetrical: The symmetrical arrangement, as of an organism or a body part, along a central axis, so that the body is divided into equivalent right and left halves by only one plane. Roundworms (nematodes) like Ascaris are worm-like organisms that are surrounded by a strong, flexible noncellular layer called a cuticle. They have a simple body plan and are bilaterally symmetrical.

Option C- Asymmetrical: It has a disproportionate arrangement of parts and exhibits no pattern whereas bilateral symmetry have an equal arrangement of parts (symmetry) about a vertical plane running from head to tail. And radial symmetry is a form of symmetry wherein identical parts are arranged in a circular fashion around a central axis.

Option D- None of the above: Ascaris is Bilaterally symmetrical therefore, the correct Option is B.

Thus, the correct answer is option B- Bilaterally symmetrical


Note: Symmetry in biology refers to the symmetry observed in organisms. These organisms include plants, animals, fungi, and bacteria. External symmetry can be effortlessly seen by just looking at an organism.