Sponges are multicellular organisms that belong to the phylum Porifera. Their body lack true tissue and organs. The complete digestive, nervous and the circulatory system is absent in them. Organisms belonging to the phylum Porifera are generally acoelomates.

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Chapter 33, Problem 4TYU

Summary Introduction

Introduction: Sponges are multicellular organisms that belong to the phylum Porifera.

Their body lack true tissue and organs. The complete digestive, nervous and the circulatory system is absent in them. Organisms belonging to the phylum Porifera are generally acoelomates.

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Phylum Arthropoda: 1. Comment on the size (number of species) within this phylum. 2. General Body Plan: (circle the appropriate answer) a) Simple or complex, b) Do they have true tissues? Yes or No c) asymmetry, radial symmetry, bilateral symmetry d) Do they have organs? Yes or No e) What type of appendages? f) What type of skeleton? 3. Describe molting.

The distinction between sponges and other animal phyla is based mainly on the absence versus the presence of (A) a body cavity. (B) a complete digestive tract. (C) mesoderm. (D) tissues.

Class Gastropoda and Class Bivalvia independently evolved modifications to their body plan that allowed them to invade sandy and muddy habitats, burying their bodies under the surface and accessing the surface via siphons. For an example organism in each Class, (1) draw a diagram showing the morphological modifications and (2) write a description of how this organism had evolved from the hypothetical ancestral mollusk (HAM) body plan.

Answer 2

Question

Chapter 33, Problem 4TYU

Summary Introduction

Introduction: Sponges are multicellular organisms that belong to the phylum Porifera.

Their body lack true tissue and organs. The complete digestive, nervous and the circulatory system is absent in them. Organisms belonging to the phylum Porifera are generally acoelomates.

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Answer 3

Question

Chapter 33, Problem 4TYU

Summary Introduction

Introduction: Sponges are multicellular organisms that belong to the phylum Porifera.

Their body lack true tissue and organs. The complete digestive, nervous and the circulatory system is absent in them. Organisms belonging to the phylum Porifera are generally acoelomates.

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Answer 4

Question

Chapter 33, Problem 4TYU

Summary Introduction

Introduction: Sponges are multicellular organisms that belong to the phylum Porifera.

Their body lack true tissue and organs. The complete digestive, nervous and the circulatory system is absent in them. Organisms belonging to the phylum Porifera are generally acoelomates.

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Answer 5

Chapter 33, Problem 4TYU

Summary Introduction

Introduction: Sponges are multicellular organisms that belong to the phylum Porifera.

Their body lack true tissue and organs. The complete digestive, nervous and the circulatory system is absent in them. Organisms belonging to the phylum Porifera are generally acoelomates.

Answer 6

Chapter 33, Problem 4TYU

Summary Introduction

Introduction: Sponges are multicellular organisms that belong to the phylum Porifera.

Their body lack true tissue and organs. The complete digestive, nervous and the circulatory system is absent in them. Organisms belonging to the phylum Porifera are generally acoelomates.

Answer 7

Chapter 33, Problem 4TYU

Summary Introduction

Introduction: Sponges are multicellular organisms that belong to the phylum Porifera.

Their body lack true tissue and organs. The complete digestive, nervous and the circulatory system is absent in them. Organisms belonging to the phylum Porifera are generally acoelomates.

Answer 8

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Answer 11

Ch. 33.1 - Prob. 1CC Ch. 33.1 - Prob. 2CC Ch. 33.2 - Compare and contrast the polyp and medusa forms of...Ch. 33.2 - Prob. 2CC Ch. 33.2 - MAKE CONNECTIONS Many new animal body plans...Ch. 33.3 - Prob. 1CC Ch. 33.3 - Prob. 2CC Ch. 33.3 - MAKE CONNECTIONS Explain how the molluscan foot...Ch. 33.4 - Prob. 1CC Ch. 33.4 - Describe two adaptations that have enabled insects...

Sponges are multicellular organisms that belong to the phylum Porifera. Their body lack true tissue and organs. The complete digestive, nervous and the circulatory system is absent in them. Organisms belonging to the phylum Porifera are generally acoelomates.

Solution Summary: The author explains that Sponges are multicellular organisms that belong to the phylum Porifera. Their body lacks true tissue and organs.

Concept explainers

Introduction: Sponges are multicellular organisms that belong to the phylum Porifera.

Their body lack true tissue and organs. The complete digestive, nervous and the circulatory system is absent in them. Organisms belonging to the phylum Porifera are generally acoelomates.

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Chapter 33 Solutions

Sponges are multicellular organisms that belong to the phylum Porifera. Their body lack true tissue and organs. The complete digestive, nervous and the circulatory system is absent in them. Organisms belonging to the phylum Porifera are generally acoelomates.

Solution Summary: The author explains that Sponges are multicellular organisms that belong to the phylum Porifera. Their body lacks true tissue and organs.

Concept explainers

Introduction: Sponges are multicellular organisms that belong to the phylum Porifera. Their body lack true tissue and organs. The complete digestive, nervous and the circulatory system is absent in them. Organisms belonging to the phylum Porifera are generally acoelomates.

Want to see the full answer?

Chapter 33 Solutions

Introduction: Sponges are multicellular organisms that belong to the phylum Porifera.

Their body lack true tissue and organs. The complete digestive, nervous and the circulatory system is absent in them. Organisms belonging to the phylum Porifera are generally acoelomates.