22. Cnidarians are A) B) bilaterally symmetrical C) radially symmetrical D) tris
ID: 282120 • Letter: 2
Question
22. Cnidarians are A) B) bilaterally symmetrical C) radially symmetrical D) trisymmetrical t) none of the above asymmetrical 23. Which of the following is not a characteristic of ferns? A) Ferns are seedless B) Ferns are small plants. C) Most ferns grow in the tropics D) Ferns need water for reproduction E) All of the above are correct. 24. The female gametophyte of an angiosperm A) embryo sac B) C) megaspore mother cell D) egg cell E) antipodal cell ovule 25. Typica pacaly, the first stage in animal development after zygote formation is a solid ball of cells called the A) blastula B) morula C) gastrula D) planula 26. Which of the following is not a type of epithelial cell? A) cuboidal cells B) squamous cells C) mast cells D) columnar cells E) all of the above are epithelial cells 27. A jellyfish is an example of a medusa body form. A) B) True False 28. A class of cnidarians that lacks a medusa stage is A) Hydrazoa B) Cubazoa C) Anthozoa D) Scyphozoa Members of phylum Platyhelminthes are called flatworms because their bodies are flattened A) posteriorly. B) laterally 29. 4Explanation / Answer
Answer to Q22 Option C Radially Symmetrical
Cnidarians have symmetry about central axis
Answer to Q23 Option B Ferns are small plants
Ferns may be large or small
Answer to Q24 Option A Embryo Sac
Embryo sac is known as female gametophyte or megagametophyte
Answer to Q25 Option B Morula
Morula is a 16 cell stage formed by first four cleavages of zygote
Answer to Q26 Option C Mast cells
Mast cells do not belong to epithelial cells but are a type of white blood cells
Answer to Q27 Option A True
Jelly fish is a type of medusa form
Answer to Q28 Option C Anthozoa
Anthozoa have only polyp form and are attached to sea beds
Answer to Q29 All the options not given, the correct answer is Dorsoventrally flattened
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