What type of symmetry do sponges that cannot be cut into 2 equal halves exhibit? bilateral O asymmetry radial Which is NOT true of Sponge reproduction? the flagellated choanocytes are responsible for larval sponge movement larval sponges swim around until they settle and become sedentary adults Othey can reproduce both sexually and asexually O sponges use mitosis to reproduce sexually Cnidaria and Ctenophora have a level of organization. organ system O cellular single-celled O tissue
The Correct Answer and Explanation is :
- Type of Symmetry in Sponges That Cannot Be Cut into Two Equal Halves
The correct answer is asymmetry. Most sponges, particularly those that do not exhibit any symmetry (i.e., cannot be cut into two equal halves), are described as asymmetrical. This is a key characteristic of many species in the phylum Porifera. Unlike more complex organisms that show bilateral or radial symmetry, sponges have an irregular shape and lack a defined plane of symmetry. This lack of symmetry is due to their simple structure and lifestyle. Sponges do not have a front, back, or any form of body patterning that would allow them to be divided into two symmetrical halves. - Which is NOT True of Sponge Reproduction
The correct answer is “sponges use mitosis to reproduce sexually.”
Sponges can reproduce both sexually and asexually. Asexual reproduction typically occurs through budding or fragmentation, where pieces of the sponge break off and develop into new individuals. In sexual reproduction, sponges are hermaphrodites, meaning they possess both male and female reproductive organs. However, they do not use mitosis for sexual reproduction. Instead, sponges reproduce sexually by releasing sperm (produced by specialized cells called spermatocytes) into the water, where it fertilizes eggs in other sponges. This process leads to the formation of larvae, which are flagellated cells that swim and eventually settle to form new sponges. The statement about mitosis is incorrect because mitosis is a form of asexual division used for growth and repair, not for the sexual formation of gametes. - Cnidaria and Ctenophora Level of Organization
The correct answer is tissue.
Cnidarians (e.g., jellyfish, corals) and Ctenophora (e.g., comb jellies) exhibit a tissue level of organization, meaning their cells are organized into specialized tissues that perform specific functions. This is more advanced than the cellular level of organization seen in sponges (which do not have tissues) but not as complex as the organ system level of organization found in more complex animals like vertebrates. At the tissue level, cells are organized into layers (e.g., the ectoderm and endoderm in cnidarians), which enable the organism to carry out functions like digestion, movement, and response to stimuli more efficiently than single-celled organisms.