9700/12 Biology May Jun 2013 Online Test | Cambridge AS and A Level MCQ
Cambridge
AS & A Level
Biology (9700)
شهریور
2013
مشاهده نمونه سوال
شامل مباحث:
AS Level
تعداد سوالات: 40
سطح دشواری:
متوسط
شروع:
آزاد
پایان:
آزاد
مدت پاسخگویی:
60 دقیقه
پیش نمایش صفحه اول فایل
Gama Admin Which properties of lignin are important for the function of xylem vessels in the stem of a tall plant, such as a tree?
1) It is inflexible so does not bend easily.
2) It is not permeable to water.
3) It is strong to resist collapse under pressure.
4) It has weaker adhesion to water molecules than cellulose.
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