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Unit 3 : Protection

TIPS

  1. Animals and plants have special characteristics and behaviours to protect themselves from danger, enemies and extreme weather.
  2. Special characteristics of animals to protect themselves are such as thick and hard skin, hard scales, sharp spines, hard shell, strong horns, sharp claws, venomous sting, hoof and special patterns or colours.
  3. Special behaviours of animals for protection are living in a herd or group, pretending to be dead, rolling or curling up, changing its body colour to match the surroundings, giving out a bad smell, breaking off its tail and shooting out ink.
  4. For animals live in the extremely hot weather, they have special characteristics such as can survive a few days without food and water, produce very concentrated urine and active at night.
  5. For animals stay in the extreme cold weather, they have thick layers of fat and thick fur to keep their bodies warm.
  6. Special characteristics of plants are sharp thorns, fine hair, produce latex, poison, strong or bad smell and response to touch.
  7. Cactus can survive in the desert because it has small leaves to reduce loss of water and thick stems to store water.
  8. Plants grow in strong wind region have feather-like leaves, strong and flexible stems and strong roots.

COMMON MISTAKES

Which of the following reasons are camels can survive in the dessert without water for days?
  1. They store water in their hump
  2. They have the ability to drink a lot of water at a time
  3. They loss very little water in their urine
  4. The fat in their hump gives them water
  1. I and II
  2. I and IV
  3. II and III
  4. III and IV
ΧCamels can go without water for days because the fat in their humps can be changed into water.
√The stored fat in the hump of a camel is used for energy when there is no food supply. Water is also produced in this process but it is too little. A camel can go without water for a number of reasons – its ability to drink a lot of water at a time and store it in its blood; very little loss of water (very little sweat and very concentrated urine) and its ability to withstand a very high body temperature without having to sweat to cool down its body.
So, the correct answer is C.
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