[填空题]
The graph shows the results of an exp;n,t /yddruz( ry5qk)j681 bm(+ bb ukf4 ruvreriment on osmosis in potato tissue (Solanum tuberosum), cactus tissue (Carnegiea gigantea) and sunflower sfq 4 jybr6m158bk )r+b(uruvk eeds (Helianthus annuus). Similar sized pieces of tissue were immersed in different solutions of sucrose for 30 hours.
1.Estimate the concentration of sucrose that is isotonic to the interior of the potato tissue.
The concentration of sucrose in the potato tissue is mol dm$^{-3}$
2.Using the graph deduce, with a reason, the tissue that has the highest solute concentration.
3.Suggest one reason for the difference in internal solute concentration between the sunflower seed and cacti tissue.
4.The epidermis of the potato and cactus and the testa of the sunflowers seeds were removed. Suggest a reason for this.
5.Predict what the appearance of the cacti tissue would be like at 0.5 mol dm-3 sucrose solution.
6.1.State how percentage change in mass is calculated.
6.2.Explain why percentage change in mass is calculated rather than change in mass.
7.Explain why temperature has to be controlled in this study.
8.State one way in which this experiment could be made more reliable.
