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Question

”Tissue in the leaf that has the highest concentration of chloroplasts". Comment.


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Solution

Tissue:

  1. Between cells and an entire organ, there is a biological organizing level called tissue.
  2. Tissue is a group of comparable cells from the same origin, along with their extracellular matrix, that works together to perform a single function.

Chloroplast:

  1. A chloroplast is a type of membrane-bound organelle known as a plastid that conducts photosynthesis mostly in plant and algal cells.
  2. The photosynthetic pigment chlorophyll captures the energy from sunlight, converts it, and stores it in the energy-storage molecules ATP and NADPH while freeing oxygen from water in the cells.
  3. The ATP and NADPH are then used to make organic molecules from carbon dioxide in a process known as the Calvin cycle.
  4. Chloroplasts carry out several other functions, including fatty acid synthesis, amino acid synthesis, and the immune response in plants.
  5. The number of chloroplasts per cell varies from one, in unicellular algae, up to 100 in plants like Arabidopsis and wheat.
  6. The tissue below the epidermis, and closest to the top of the leaf has the highest concentration of chloroplasts and performs maximum photosynthesis.


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