9th Class Science Diversity in Living Organisms Question Bank 9th CBSE Science Diversity in Living Organisms

  • question_answer
      How do gymnosperms and angiosperms differ from each other?  

    Answer:

       
    Gymonosperms Angiosperms
    1.  The plants bear naked seeds. 2. The sporophyte carries the male and female sex organs. 3. Ovules are not enclosed in ovary. 4. Plants of this group are usually evergreen, perennial and woody. 5. Xylem lacks vessel. 6. Phloem does not contain companion cells. 1. Seeds are enclosed in fruits. 2. Reproductive organs are flowers, carrying male and female sex organs. 3. Ovules are enclosed in ovary. 4. Plants of this group may be annual, biennial or perennial. They may be woody or non-woody. 5. Xylem contains vessels. 6. Phloem contains companion cells.
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    Poriferan Animals Coelenterate Animals
    1. These organisms have minute pores called ostia all over the body and a large opening called osculum at the  top. 1. These organisms have a single pore.
    2. Body is made up of a single layer of cells. 2. Body is made of two layers of cells, one making the outer lining and the other the inner lining of the body.
    3. Canal system for circulating water through the body is present. 3. No water canal system present in the body.
    4. Exoskeleton present. The body design involves very little differentiation and division into tissues. 4. Exoskeleton absent. More body design differentiation is shown by these animals.
    5. These are non-motile animals and are attached to some solid support. 5. These are motile animals. Some species of this group live in colonies while others have a solitary life span.
    6.Tentacles are absent. 6. Tentacles are present.
     


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