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Plant Kingdom — BIOLOGY STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceBIOLOGYPlant Kingdom3 Marks
Question
Amrita while playing with her friend, near the pond noticed in the pond that a green colour covering is floating on the surface of the water. She discussed this with her friend and both got surprised. Next day in the school Amrita asked her teacher about the same. Teacher told her, that was nothing, but green algae which occur both in fresh and marine water habitats.
  1. Mention the economic importance of algae.
  2. Why green algae are considered to be the ancestors of all land plants. Justify the statement by giving reasons.
  3. What values as a good biology student are reflected from Amrita's character.
✓

Answer

  1.  
  1. Algae are used as source of agar-agar which is solidifying medium of culture media, jams and jellies.
  2. Many algae like Chlorella and Spirulina are good sources of protein.
  1. There are many evidences shown by many algal genera which show that these are connecting link between them and bryophytes. Many members of Phaeophyta can survive in low tidal areas of sea and show adaptations to terrestrial habitat.
  2. Amrita is a good observer, curious and has scientific bend of mind.

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