Available Answers

1. 1.

   How do the roots, leaves stem, and thorns of a cactus help it to survive in the dry, desert environment?
2. 2.

   Fill in the blanks.

   The spreading of seeds in different ways is called ______________  ______________. Some plants produce  ______________ instead of seed.

3. 3.

   Briefly explain seed dispersal by wind, bursting, animals, or water. Include a diagram if you can.
4. 4.

   Choose the correct option.

   1. Plants usually lose water through their
      1. stem
      2. trunk
      3. roots
      4. leaves
   2. In order to climb trees, climbing plants have long
      1. twine
      2. fruit
      3. tendrils
      4. thorns
   3. These tree grow in swampy areas and their roots grow out of the water.
      1. rafflesia
      2. onion
      3. Venus flytrap
      4. mangrove
   4. This plant has a parachute of tiny hairs.
      1. dandelion
      2. cone
      3. sycamore
      4. cactus
   5. Deserts usually have these conditions.
      1. hot night/cold day
      2. cold night/hot day
      3. hot day/hot night
5. 5.

   Mark the sentences √ or x. Correct the mistakes and rewrite the sentences in your notebook.

   1. All plants produce seeds.
   2. Animals help to spread seeds.
   3. Mangroves grow well in the desert.
   4. A sycamore seed has hooks.
   5. A puffball contains spores.
6. 6.

   You have learnt that the cactus and other desert plants have thick, spongy stems to conserve water. Their leaves have now become spines (like thorns). If they had large leaves, more water would be lost to the air. The cactus has developed ways of conserving water!

   Can you say why the cactus usually has a smooth, shiny stem?