Chapter 7 with anwers
16) Leaf venation patterns in ________ leaves are usually netlike or reticulate. A) dicot B) monocot C) grass D) very small E) large leaves such as banana
A. dicot
2) A cluster of leaflets attached to the end of the petiole would be characteristic of a A) pinnately compound leaf. B) palmately compound leaf. C) twice pinnately compound leaf. D) whorled leaf. E) simple leaf.
B. palmately compound leaf.
15) Sugars produced in photosynthesis are "loaded" into the ________ of the leaf for transport throughout the plant. A) mesophyll B) phloem C) xylem D) bundle fibers E) cuticle
B. phloem
4) All leaves originate as A) bud scales. B) primordia. C) axillary buds. D) terminal buds. E) stipules
B. primordia.
1) Typical leaves function as ________ in the plant. A) a heat source B) solar panels C) mineral absorption organs D) storage organs E) water absorption organs
B. solar panels
11) The venation that forks repeatedly in leaves is termed A) pinnate. B) palmate. C) dichotomous. D) bilateral. E) parallel.
C. dichotomous.
. 18) In spines most of the normal leaf tissue is replaced with A) collenchyma. B) chlorenchyma. C) sclerenchyma. D) ray cells. E) cortex.
C. sclerenchyma.
12) The opening and closing of stomata is governed by ________ levels in the guard cells. A) salt B) chlorophyll C) water D) acid E) sodium
C. water
6) Which of the following is a function of a stoma? A) diffusion of oxygen to the interior of a leaf B) diffusion of carbon dioxide out of the leaf C) allowing light to reach the interior of a leaf D) facilitating transpiration E) All of these answers are correct
D. facilitating transpiration
. 7) The arrangement of leaves on a stem is referred to as ________. A) the venation B) alternate C) nodular D) phyllotaxy E) random distribution
D. phyllotaxy
8) A leaf arrangement in which there are three or more leaves at a node is called A) alternate. B) opposite. C) palmate. D) whorled. E) pinnate.
D. whorled.
17) Which of the following is known to be modified as a tendril? A) rachis B) leaflet C) stipule D) petiole E) All of these answers are correct
E. all of these answers are correct.
19) Modified leaves are used by insectivorous plants to trap insects. One such plant that has movable modified leaves is A) Venus flytrap. B) sun mellon. C) pitcher plant. D) bladderwort. E) Both Venus flytrap and pitcher plant are correct.
E. both [Venus flytrap and pitcher plant] are correct
14) Because of the greater light intensity and heat absorption on the upper surface of the leaf, the upper surface has A) more stomata than the lower surface does. B) fewer stomata than the lower surface does. C) a thicker cuticle than the lower surface does. D) both more stomata and a thicker cuticle than the lower surface does. E) both fewer stomata and a thicker cuticle than the lower surface does
E. both [fewer stomates than the lower surface and a thicker cuticle than the lower surface] are correct
9) The epidermis of leaves normally is coated with A) suberin. B) lignin. C) resin. D) latex. E) cutin.
E. cutin.
5) The plant part that facilitates a leaf blade being oriented at right angles to the sun is a/an A) stipule. B) axillary bud. C) terminal bud. D) midrib. E) petiole.
E. petiole
10) In a leaf such as a sunflower, the average number of stomates on the lower surface is approximately ________. A) 2,000,000 B) 18,000 C) 5,000. D) 250. E) 25.
a. 2,000,000
20) In an energy-conscious world, people may plant more trees around their homes because ________. A) they may use the trees for fuel B) leaves of trees provide shade and reduce energy use for cooling homes C) the leaves serve as insulation during winter D) leaves may be composted for soil fertility E) trees protect the roof from wind damage
b. leaves of trees provide shade and reduce energy use for cooling homes
13) In most leaves the number of stomata per square centimeter of surface is A) 25-50. B) 100-200. C) 250-500. D) 500-750. E) over 1,000.
e. 1,000
3) A leaf that lacks a petiole is termed A) clasping. B) sheathing. C) emergent. D) dentate. E) sessile
e. sessile
