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. Animals with light air-filled bones show _________.
      1. aquatic adaption
      2. desert adaption
      3. mountain adaption
      4. aerial adaption
   7. Which of the following is a correct match?
      1. fish-hump
      2. pigeon-thick fur
      3. Mountain goat-wolly coat
      4. Xerophytes-marshy places
   8. Body of both fish and 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 _________________ shaped leaves.
   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. A fully submerged plant
   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 adaption? In which organisms can this adaption be found?

6. 6.

   How is a water lily adapted to its habitat?