Please answer this question. This chapters name is transportation and excretion. For class 7 .Subject is biology . PLEASE ANSWER IT FAST AS I HAVE A TEST OF THIS CHAPTER
Answers
1. the transportation of substances takes place through blood.
2. The reason is that the impure pumped away from heart so that is goes to kidney/lung for purification/oxidation and then it comes again and then pumped to the rest of the body. So this thing is known as double circulation as the blood is pumped two times for a single beat.
3. the color of blood is red due to presence of haemoglobin(hb) in red blood cells
4. Sweat helps cool you down by releasing moisture onto your skin. But that's not all that's going on. On a hot day, your sweat evaporates from your skin taking a little bit of your body heat with it. ... So your sweat won't evaporate very much because the humid air can't hold very many more water molecules.
5.The water keeps plants fresh and turgid. When a plant does not get enough water, it wilts and droops due to loss of turgidity by decrease in the amount of water in plant cells/parts .
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