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单选题 The plant part that facilitates a leaf blade being oriented at right angles to the sun is a/an
学科：默认课程
时间：2025-11-29 05:30:01
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题目1单选题
Typical leaves function as _______________ in the plantA. a heat sourceB. solar panelsC. mineral absorption organsD. storage organsE. water absorption organs
题目2单选题
A cluster of leaflets attached to the end of the petiole would be characteristic of aA. pinnately compound leafB. palmately compound leafC. twice pinnately compound leafD. whorled leafE. simple leaf
题目3单选题
The plant part that facilitates a leaf blade being oriented at right angles to the sun is a/anA. stipuleB. axillary budC. terminal budD. midribE. petiole
题目4单选题
Which of the following is primarily responsible for forcing water out of hydathodesA. root pressuresB. transpirationC. osmosisD. photosynthesisE. none of these answers are correct
题目5单选题
The arrangement of leaves on a stem is referred to as __________________A. the venationB. alternateC. nodularD. phyllotaxyE. random distribution
题目6单选题
A leaf arrangement in which there are three or more leaves at a node is calledA. alternateB. oppositeC. palmateD. whorledE. pinnate
题目7单选题
Which statement about venation is INCORRECTA. Venation refers to arrangement of the veins within a leafB. Venation patterns include pinnate, palmate and dichotomousC. Some flowering plants have leaves that lack venation even though the stems and roots have vascular bundlesD. In general, monocots exhibit parallel venationE. Venation is important for delivering water to leaf cells and taking sugars to the stem
题目8单选题
Leaf veins are located in which of the followingA. upper epidermisB. enationsC. lower epidermisD. endodermisE. mesophyll
题目9单选题
The jacket of cells surrounding a leaf vein is usually termed a/anA. bundle sheathB. protective parenchyma layerC. fiber-tracheid layerD. rayE. myelin sheath
题目10单选题
In a leaf such as a sunflower, the average number of stomates on the lower surface is approximately ___________A. 2,000,000B. 18,000C. 5,000D. 250E. 25
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