the question we got was...
Compare and Contrast the transport systems that provide cells with the necessary components for respiration and remove respiration waste products in plants and in animals. [10 + 1] [11 marks]
This is what i have soo far.....
Respiration in plants: Gas exchange is essential for photosynthesis, the plant organ that is involved in this process is the leaf. Plants take in carbon dioxide through holes on the undersides of their leaves known as stomata.
Respiration in animals: Gas exchange is by diffusion. The circulatory system is in close association with the respiratory system. Oxygen is either already dissolved in water or dissolves in the water at the respiratory surface. Oxygen moves into the circulatory system by diffusion. Oxygen moves through the circulatory system. Gases are exchanged at the tissue again by diffusion.
Plants do not need O2 carrier (in contrast to animals) where O2 is carried by blood). This is because O2 requirement is less than in animals and plants have a large surface area (leaves) to absorb the required amount of O2 through diffusion. In plants, O2 released during photosynthesis in day time is made available for respiration. However, rate of photosynthesis is greater than that of respiration. Thus, plants give out excess O2 in the daytime. However, they give out only CO2 at night as photosynthesis stops in the absence of sunlight. Animals give out CO2 at all times.
Could you guys help me out with wat else i could write....plzzz
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- Thread Starter
- 28-11-2010 14:15
- 29-11-2010 20:59