Measurements of the stem of a young tree showed that the diameter varied slightly. It decreased during the day and increased during the night.
Which statement explains these observations?
1 )
During the day, cohesion between water molecules and lignin in the walls of the xylem vessels pulls the walls of the vessels inwards.
During the day, the tension developed in a moving column of water molecules reduces the pressure inside the xylem vessels, so that their walls move inwards.
3 )
During the night, the adhesion of water molecules to the lignin in the walls of the xylem vessels pushes the walls of the vessels outwards.
4 )
During the night, the pressure of the column of water molecules adhering to one another increases and pushes the walls of the xylem vessels outwards.
تحلیل ویدئویی تست
تحلیل ویدئویی برای این تست ثبت نشده است!
پرسش و پاسخ های مشابه
سوال کنید یا به سوالات دیگران پاسخ دهید ...