euspongia belong to the group
a. protozoa
b. porifera
c. Annelida
d. arthropoda
Answers
Answer:
Euspongia is called as bath sponge because of its texture consisting of wooly, spong-like fibres, something like the sponges used for scrubbing while taking bath. Hence euspongia are known as bath sponges.
Explanation:
(1) Protozoans are the simple and primitive organisms
(2) free living or parasitic
(3) All the free living forms are aquatic
(4) asymmetrical or radially symmetrical or bilaterally symmetrical
(5) They are unicellular (acellular)
(6) They have protoplasmic grade of organization.
(7) Locomotion is affected by flagella, cilia or pseudopodia.
(8) Nutrition is holophytic, holozoic, saprozoic or parasitic.
(9) Digestion is intracellular
(10) Excretion & Respiration occurs by diffusion
(11) In fresh water protozoans osmoregulation is carried out by the contractile vacuoles.
(12) Encystment is a common phenomenon
(13) Reproduction occurs by asexual and sexual methods.
(ii) Classification of Protozoa
(a) Class 1. Flagellata or Mastigophora
(1) The body is covered by a thin pellicle or cuticle.
(2) The locomotory organs are flagella.
(3) The contractile vacuoles are present in fresh water forms with accessory vacuoles.
(4) Chloroplast is found in some forms.
(5) They may be free-living or parasitic.
(6) The class flagellata has been divided into eight orders.
(7) Examples: Chrysamoeba, Cryptomonas, Euglena, Volvox, etc.
(8) Euglena is a connecting link between Animal & Plant.
(9) Trychonymph (symbiotic) live in alimentary canal of termite that is digest to cellulose.
Basis for Animal Kingdom Classification
Classification of Animal Kingdom is based on various fundamental features like –
Levels of Organisation,
Symmetry,
Diploblastic and Triploblastic Organisation,
Coelom development,
Segmentation of the body and
Presense or absence of Notochord.
The broad classification of Animalia based on common fundamental featuresPhylum Porifera
Have you seen SpongeBob Square Pants? How weird would it sound if it was called Porifera Bob Square Pants? The creator of this series was a marine biologist who was fascinated with the ocean and used many marine animals, including the Sponges in his animated cartoon series. Read along to find more interesting bits of scientific information about Porifera.
Arthropods are characterized by their jointed limbs and cuticle made of chitin, often mineralised with calcium carbonate. The arthropod body plan consists of segments, each with a pair of appendages. The rigid cuticle inhibits growth, so arthropods replace it periodically by moulting. Arthropods are bilaterally symmetrical and their body possesses an external skeleton. Some species have wings.
An arthropod's primary internal cavity is a haemocoel, which accommodates its internal organs, and through which its haemolymph – analogue of blood – circulates; it has an open circulatory system. Like their exteriors, the internal organs of arthropods are generally built of repeated segments. Their nervous system is "ladder-like", with paired ventral nerve cords running through all segments and forming paired ganglia in each segment. Their heads are formed by fusion of varying numbers of segments, and their brains are formed by fusion of the ganglia of these segments and encircle the esophagus. The respiratory and excretory systems of arthropods vary, depending as much on their environment as on the subphylum to which they belong.
Their vision relies on various combinations of compound eyes and pigment-pit ocelli: in most species the ocelli can only detect the direction from which light is coming, and the compound eyes are the main source of information, but the main eyes of spiders are ocelli that can form images and, in a few cases, can swivel to track prey. Arthropods also have a wide range of chemical and mechanical sensors, mostly based on modifications of the many bristles known as setae that project through their cuticles.
Arthropods' methods of reproduction and development are diverse; all terrestrial species use internal fertilization, but this is often by indirect transfer of the sperm via an appendage or the ground, rather than by direct injection. Aquatic species use either internal or external fertilization. Almost all arthropods lay eggs, but scorpions give birth to live young after the eggs have hatched inside the mother.
Arthropods contribute to the human food supply both directly as food, and more importantly indirectly as pollinators of crops. Some species are known to spread severe .