Available Answers

1. 1.

   Fill in the blanks with the correct words.

   1. An earthworm's body is made up of several parts called ____________ (segments/tentacles).
   2. Snails have a ____________ (shell/foot) to protect themselves from enemies.
   3. Sticky ____________ (mucous/tentacles) enables the snail to crawl on a variety of surfaces.
   4. A cockroach has ____________ (two/three) pairs of wings.
   S A M P L E

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   Answer:

   S A M P L E

   1. segments
   2. shell
   3. mucous
   4. three
2. 2.

   Identify the animals as vertebrates or invertebrates.

   1. Earthworm
   2. Snail
   3. Birds
   4. Fish
   S A M P L E

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   Answer:

   S A M P L E

   1. Earthworm: Invertebrate
   2. Snail: Invertebrate
   3. Birds: Vertebrates
3. 3.

   Write T for the true statements and F for the false one. Correct the false statement(s).

   1. Most fishes do not have a streamlined body.
   2. Fish have finds and a flexible backbone that help them to swim.
   3. Birds have hollow bones.
   4. Snakes move by crawling on their bellies.
   5. Snakes have scales on their bodies.
   S A M P L E

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   Answer:

   S A M P L E

   1. False Most fishes have a streamlined body.
   2. True
   3. True
   4. True
   5. True
4. 4.

   Fill in the blanks with the correct words.

   1. ____________ (Joints/Cartilage) are places where two or more bones meet.
   2. The ____________ (ball-and-socket/pivot) joint is present in our shoulders.
   3. Our neck is joined to the head with the help pf a ____________ (pivot/hinge) joint.
   4. Bones cannot bring about movement without the help of ____________ (cartilage/muscles).
   5. When a muscle contracts, it ____________ (pushes/pulls) the movable bone.
5. 5.

   Name the following.

   1. The substance filled inside the bones.
   2. The movable bone in the human skull.
   3. The number of bones in the human skeleton.
   4. The kind of joint present in our elbow and knee.
   5. Tough elastic tissue that covers the bone.
6. 6.

   Choose the correct option.

   1. Birds can fly because they have
      1. a streamlined body
      2. hollow bones
      3. wings with feathers
      4. all of these
   2. Which of these special structures helps a snake to crawl?
      1. Cerci
      2. Fins
      3. Scales
      4. Segments
   3. Movement is brought about by the contraction and relaxation of
      1. bones
      2. muscles
      3. joints
      4. joints and muscles
   4. Which of the following is not a movable joint?
      1. Knee joint
      2. Joints in the skull
      3. Ankle joint
      4. None of these
   5. The knee joint is an example of
      1. pivot joint
      2. ball-and-socket joint
      3. hinge joint
      4. gliding joint