Concept explainers
a.
To determine: The location and function of choanocytes.
Introduction: Choanocytes are present in sponges. They have flagella and fringe of protoplasm is present at the base of flagella. They are also known as “collar cells”. They make up a layer called choanoderm in sponges.
a.
Explanation of Solution
Location: Choanocytes are usually flagellated. These flagellated choanocytes line the spongocoel. Spongocoel is the large cavity present in the center of sponges.
Function: The functions of choanocytes are as follows:
- They create water current enabling the flow of water through the sponge.
- They trap bacteria and engulf food particles by the process of phagocytosis.
b.
To determine: The location and function of amoebocytes.
Introduction: They are present in sponges and also in many other groups of invertebrates. They are capable of amoeboid movement due to presence of pseudopodia.
b.
Explanation of Solution
Location: Amoebocytes are present in the mesohyl region. Mesohyl is the gelatinous layer that separates the two body layers of sponges.
Function: The functions of amoebocytes are as follows:
- They move through the mesohyl and take up food materials from choanocytes and surrounding water medium.
- Digest food material and carry the nutrients to other cells through their amoeboid movement.
- They manufacture the tough skeletal fibres inside the mesohyl.
Want to see more full solutions like this?
Chapter 33 Solutions
Biology - Study Guide
- Which is not a characteristic of animals a. Have a blastula stage b. Cell walls c. Heterotrophy d. Multicellulararrow_forwardUsing the diagram below, answer the following questions.arrow_forwardMuscle tissue is made up of cells that contract and release to produce movement. Which process provides the energy that the cells need to contract? A. Photosynthesis B. Mitosis C. Respiration D. Meiosisarrow_forward
- Biology / Human Histology *Refer to the attached photo and answer this question: What is the function of the tissue pointed by the arrow?arrow_forwardObserve the body structure of the organism in the diagram. Which type of organism is this? A. Cnidaria B. Porifera C. Mollusca D. Arthropodaarrow_forwardwhat are the three structures shown in the pictures? a: b: c:arrow_forward
- An additional notochord is grafted next to the developing neural tube. Answer the following questions. (a) what new cells would you expect to develop in the region of the neural tube closest to the graft? (b) What is the notochord-derived molecule that is responsible for the effect?arrow_forwardThe cells that pull the archenteron through the blastocoel in the sea urchin are _____ cells called mesenchyme Group of answer choices A. mesoderm B. endoderm C. meroblastic D. macrolecithalarrow_forwardGive typing answer with explanation and conclusion Which of the following is the reason for existence of vestigial structures (useless parts of the body)? Question 5 options: A) They must have functioned in the near past. B) They must have functioned in similar organisms. C) They must have functioned in other organisms. D) They must have functioned in ancestral organisms.arrow_forward
- Concepts of BiologyBiologyISBN:9781938168116Author:Samantha Fowler, Rebecca Roush, James WisePublisher:OpenStax College