Transport In Plants

Transport in Plants

1. Water is conducted through plant stems in the xylem.
2. Food can travel up and down the stem in the phloem.
3. Roots have no chlorophyll and grow in darkness. They obtain food from the leaves, which photosynthesize, and send energy (starch) down the stem through the phloem.
4. An increase in humidity is least likely to increase the rate of transpiration in a plant.
5. Draws water up the stem (a), dissolved salts up the stem (b) and has a cooling effect on the leaves (d)
6. Transpiration
7. A photometer is an apparatus which can be use to (a) measure the rate of water uptake in a shoot, (b) measure the rate of transpiration in a shoot and (d) compare rates of transpiration in different conditions.
8. Photosynthesis 9. When the student took the apparatus outside, a few variables were changed, e.g. light intensity, temperature, humidity, and air movement. It would have been better if the student had just used a lamp to investigate the amount of sunlight. Therefore, not as many variables affect the experiment. The student took the second set of readings straight away and ‘without delay’, so the new rate was not established.