Home / General Knowledge / Biology :: section - 2

General Knowledge :: Biology

  1. Ordinary table salt is sodium chloride. What is baking soda?

  2. A.

     Potassium chloride

    B.

     Potassium carbonate

    C.

     Potassium hydroxide

    D.

     Sodium bicarbonate


  3. Ozone hole refers to

  4. A.

     hole in ozone layer

    B.

     decrease in the ozone layer in troposphere

    C.

     decrease in thickness of ozone layer in stratosphere

    D.

     increase in the thickness of ozone layer in troposphere


  5. Pine, fir, spruce, cedar, larch and cypress are the famous timber-yielding plants of which several also occur widely in the hilly regions of India. All these belong to

  6. A.

     angiosperms

    B.

     gymnosperms

    C.

     monocotyledons

    D.

     dicotyledons


  7. Pollination is best defined as

  8. A.

     transfer of pollen from anther to stigma

    B.

     germination of pollen grains

    C.

     growth of pollen tube in ovule

    D.

     visiting flowers by insects


  9. Plants receive their nutrients mainly from

  10. A.

     chlorophyll

    B.

     atmosphere

    C.

     light

    D.

     soil


  11. Movement of cell against concentration gradient is called

  12. A.

     osmosis

    B.

     active transport

    C.

     diffusion

    D.

     passive transport


  13. Photosynthesis generally takes place in which parts of the plant?

  14. A.

     Leaf and other chloroplast bearing parts

    B.

     steam and leaf

    C.

     Roots and chloroplast bearing parts

    D.

     Bark and leaf


  15. Most fish do not sink in water because of the presence of:
    I. swim bladder
    II. air bladder
    III. air sacs
    IV. air in spongy bones

  16. A.

     I and II are correct

    B.

     II and III are correct

    C.

     III and IV are correct

    D.

     I, II, III and IV are correct


  17. Plants synthesis protein from

  18. A.

     starch

    B.

     sugar

    C.

     amino acids

    D.

     fatty acids


  19. Plants absorb dissolved nitrates from soil and convert them into

  20. A.

     free nitrogen

    B.

     urea

    C.

     ammonia

    D.

     proteins