Available Answers

1. 1.

   Choose the correct answer:

   1. A free floating plant is
      1. water lily
      2. water hyacinth
      3. Hydrilla
      4. Vallisneria
   2. Halophytes mostly survive in _______________ areas.
      1. sandy
      2. marshy
      3. arid
      4. hilly
   3. Aerial plants are mostly found in _______________.
      1. rain forests
      2. coniferous forests
      3. temperate regions
      4. deciduous forests
   4. The _______________ fin in fishes help to change directions.
      1. anal
      2. tail
      3. dorsal
      4. pelvic
   5. Hump in camels is used to store _______________.
      1. water
      2. vegetables
      3. fat
      4. air
   6. Volant adaptation is the other name of _______________.
      1. aquatic adaptation
      2. desert adaptation
      3. mountain adaptation
      4. aerial adaptation
   7. Which of the following is a correct match?
      1. Fish-hump
      2. Pigeon-thick fur
      3. Mountain goat-woolly coat
      4. Xerophytes-marshy places
   8. Body of both the fish and the pigeon are _______________.
      1. streamlined
      2. concave
      3. cylindrical
      4. conical
   9. Spines in plants help to check _______________.
      1. photosynthesis
      2. transpiration
      3. absorption
      4. respiration
   10. Which of the following statements is correct?
       1. Xerophytes are plants that live in water.
       2. The lungs of birds have air sacs.
       3. Camels store water in their hump.
       4. Water hyacinth is fully submerged in water.
2. 2.

   Fill in the blanks with suitable word/words:

   1. Habitat is the _______________ home of organisms.
   2. Adaptation can be _______________ or _______________.
   3. Hydrophytes are plants that are _______________ or _______________ adapted to life in water.
   4. The stem of cactus is _______________ and _______________ which helps in _______________ of water.
   5. Pine trees have _______________ shape and _______________ shaped leaves.
   6. Aerial plants are mostly found in _______________.
   7. Camel has _______________ _______________ toes and _______________ eyelashes.
   8. Desert animals conserve water as they _______________ or _______________ in less amounts.
   9. In birds, _______________ are modified into wings.
   10. Mountain goat survives on vegetation that is usually _______________ and _______________.
3. 3.

   Give one word for the following:

   1. A xerophytic plant
   2. Respiratory organs of fish
   3. The other name of aerial adaptation
   4. The ancestral habitat of whales
   5. A plant living in marshy areas
   6. The type of bones in birds
   7. The fin that helps the fish to change directions
   8. The type of roots in mangroves
   9. An aerial plant
   10. The coat colour of mountain goat
4. 4.

   State two examples in each case

   1. Physical factors of habitat
   2. Mountainous plants
   3. Aerial plants
   4. Hydrophytes
   5. Mesophytes
5. 5.

   What is the meaning of secondary adaptation? In which organisms can this adaptation be found?

6. 6.

   How is a water lily adapted to its habitat?