Question

1. Name the only phylum of primitive animal species which possess no notable body symmetry, have no true “tissue” and rely on a simplified water canal body plan
   1. Porifera                                                                    c. Annelida
   2. Cnidaria                                                                    d. Mollusca

2. Which of the following is NOT a genus of the “great apes”, those that increased have cognition and live a less arboreal (tree dwelling) lifestyle than other primate species?
   1. Genus Pan                                                               c. Genus Homo
   2. Genus Gibbon                                                       d. Genus Pongo

3. What major class of vertebrates have a complete 4-chambered heart, are endothermic, have highly modified forelimbs, exhibit parental care, and have a stream-lined body plan?
   1. Class Aves                                                                c. Class Amphibia
   2. Class Reptilia                                                           d. Class Mammalia

4. Which of the following is NOT one of the major traits exhibited by species in the diverse group of species in the large Phylum Mollusca?
   1. Notochord                                                               c. Shell-constructing mantle
   2. Visceral Mass                                                         d. Muscular foot/pseudopod

Answer 1

1.) a

Porifera:-- Here porifera means pore bearing organism.

These are multicellular means made up of many cells and no tissue system only clusture of cells is working here.

Most of them are marine while a few are fresh water forms.

Body is cylindrical, asymmetrical or has radial symmetry carrying canal system to deal with water flow. Canal is made up of many choanocytes or coller cells.

eg. Sycon, Hylonema etc.

2.) c

Homo genus is the modern man and has many changes that makes them less arboreal than other primates.

Bipedalism:- It was the most powerful adaptation that made them less arboreal.

Note:-- Primates are having many diverse species more than 300 after following:--

rodents

bats

3 ) d

Mammals are having :--

->Full 4 chambered heart:-- Two arteria, two ventricles

->Endothermic:- body is capable to control heat own self.

-> Parental care:-- In most of the cases parent are is high.

-> Forelimbs:-- our hands have been developed a lot to commit many things with precision.

4.) a

Note-- Mollusks:-- The second-largest phylum of invertebrate animals after the arthropoda.

Molluscans are nonchordates. They are having shell constructing mantle and visceral mass and psudopods etc.

That's it.

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