Question

Scypha has
A. Bilateral symmetry
B. Spherical symmetry
C. Radial symmetry
D. No symmetry

Answer 1

Hint: Scypha belongs to phylum Porifera. They are primitive animals and invertebrates. They lack tissues and organs. Some species of Poriferans show symmetry but most of them lack symmetry or are asymmetrical.

Complete answer:
Porifera is a phylum that comprises primitive invertebrates. Scypha belongs to the phylum Porifera. The body of these organisms are full of pores. The largest pore is known as the osculum present on the top of the cylindrical body. The shape of their body is adapted to achieve maximum efficiency of water flow. True tissue and organs are absent in sponges. These organisms are radially symmetrical or asymmetrical.
The arrangement of body parts in radial symmetry is around a central axis in a way that if they are cut through the center, we will get identical parts. Scypha exhibits a radial symmetry.
Bilateral symmetry is when an organism contains only one plane of symmetry. If we cut up the organism through the specific plane, we will get two mirror image halves – left and right. Organisms that have bilateral symmetry are flatworms, sea urchins, octopus and all vertebrates.
If an organism can be cut up in identical halves through any plane passing through the center, it is said to be Spherical symmetry. Freshwater green algae are known to exhibit spherical symmetry.
Organisms that do not show any body symmetry are said to be asymmetrical. Certain members of Porifera demonstrate body asymmetry.

Therefore, option (C) is correct.

Additional Information: Scypha or Sycon belong to the phylum Porifera. Scypha are diploblastic animals with an intermediate mesenchymal layer. These are cylindrical animals attached to a substratum. The free end of the body contains the largest pore called osculum. The osculum is surrounded by spicules. The body of Scypha is composed of different types of cells which are not organized into tissue. The cells are called pinacocytes, choanocytes, amoebocytes, porocytes. The canal system is well developed. The water brings in food and oxygen in the body and takes away waste products. Scypha mainly feeds on bacteria, protozoa and organic matter. The internal skeleton of these animals are calcareous spicules, made up of calcium carbonate. The respiration takes place by simple diffusion. Scypha can reproduce both sexually and asexually.

Note: Scypha belongs to phylum Porifera. These organisms are sessile, that is they remain attached to the substratum. The internal skeleton is made up of calcareous spicules and the water vascular system is well developed. Scypha demonstrates radial body symmetry.