Available Answers

1. 1.

   Choose the most appropriate answer.

   1. These animals have a large pore at the top and many small pores all over the body
      1. Annelids
      2. Cnidarians
      3. Molluscs
      4. Sponges
   2. These bilaterally symmetrical animals have only one opening of the gut.
      1. Cnidraians
      2. Nemathelminthes
      3. Platyhelminthes
      4. Arthropods
   3. which of the following organisms is called farmers friend?
      1. earthworm
      2. oyster
      3. snail
      4. butterfly
   4. Animals belonging to this group have a segmented body.
      1. platyhelminthes
      2. mollusca
      3. annelida
      4. arthropoda
   5. This group of animals includes oysters and calms
      1. arachnida
      2. crustacea
      3. myriapoda
      4. mollusca
   6. Animals belonging to this group have spines sticking out through their skin
      1. arthropoda
      2. mammalia
      3. mollusca
      4. echinodermata
   7. This group of animals have dry scaly skin and lay eggs that have leathery shells
      1. amphibians
      2. pisces
      3. molluscs
      4. reptiles
   8. which of these groups of animals are warm blooded?
      1. reptiles
      2. aves
      3. pisces
      4. amphibians
   9. The skeleton of animals belonging to this class is very light because their bones have large air cavities
      1. Mammalia
      2. amphibia
      3. reptilia
      4. aves
   10. Animals belonging to this group are the only animals that produce milk for their young ones
       1. Reptilia
       2. pisces
       3. mammalia
       4. aves
2. 2.

   Fill in the blanks.

   1. Sponges have small openings called _____________________ all over the body
   2. Cnidarians have a number of finger- like structures called __________________ around the month.
   3. The body is considered to be __________________ when it can be divided into identical halves along any plane.
   4. Annelids have special organs of excretion called ______________________
   5. The body of arthropods i differentiated into _____________________, _________________ ,and  ___________________
   6. Organisms belonging to the phylum ___________________, have a soft body often covered by a hard shell.
   7. Animals belonging to the phylum echinodermata, have ___________________ on their skins.
   8. ___________________ have a large number of tiny tube like feet that end in suckers.
   9. The backbone is made up small bones called ____________________
   10. All ___________________ have a well-developed closed circulatory system.
   11. The body temperature of ___________________ animals changes when the temperature of the environment changes.
   12. The body of most arthropods has a tough outer covering called ____________________
   13. Cnidarians have _______________________ symmetrical body
3. 3.

   Give two examples of each of the following:

   1. Poriferans
   2. Cnidarians
   3. Annelids
   4. Arthropods
4. 4.

   Define Tentacles.

5. 5.

   Define Bilaterally symmetrical.

6. 6.

   Define Exoskeleton.