Question

mals: Invertebrates and Vertebrates Annelida Deuterostome Mollusca Arthropoda Ecdysozoa Nematoda Bilateria Echinodermata Platyhelminthes Chordata Eumetazoa Porifera Cnidaria Lophotrochozoa Protostome 75. 76. 77 78. 79. 80. 81. 82 83. Watworms os Semented worms doms, als Foundworms sea stars. sea urchins jellyfish, coral, anemones crustaceans, insects, spiders RADIAL vertebrates 85. 84. NO TISSUES 86. (feeding structure) 87. (shed exoskeleton) 88) The most ancient branch point in animal phylogeny (what distinguishes sponges from other animals) is that between having A) radial or bilateral symmetry. B) a well-defined head or no head. C) diploblastic or triploblastic embryos. D) true tissues or no tissues. 89) Which of the following is (are) unique to animals? A) cells that have mitochondria B) the structural carbohydrate, chitin C) nervous conduction and muscular movement D) heterotrophy E) both A and C 90) Among the characteristics unique to animals is A) gastrulation B) multicellularity. C) sexual reproduction. D) flagellated sperm. E) heterotrophic nutrition.

Answer 1

Ans 88). The most ancient branch point in animal phylogenyis that between having true tissue or no tissue, because sponges doesnot have tissue they have muticelluar cell. Onwards, sponges there is formation of tissue which is formed from manay multicelullar cell.

Ans 89). The structural carbohydrate chitin is unique to animals because these chitin have unique to Phylum arthropoda. In phylum arthropodatere is formation of hard chitinous exoskeleton all over the body to protect them from other organism.

Ans 90). gastrulation is unique to animals because gastrulation is process of developing the embryo which is also unique in animals. Since embryo is only present in the mammals the gastrulation is unique to animals.