question_answer

  (a) If a potted plant is covered with a glass jar, water vapours appear on the wall of the glass jar. Explain. (b) What is the function of cardiac muscle fibre? (c) Name the cells of bone and cartilage.

Answer:

  (a) Water vapour released through the stomatal aperture during transpiration, accumulate on the wall of glass jar.                                                                                                                                                                                                (1)                 (b) These muscles are found only in heart. They help in beating of heart and work 24 hours a day till death.                                                                                                                                                                                                                                 (1)                 (c) Bone?Osteocytes                 Cartilage?Chondrocytes.                                                                                                                                                           (1)