Biology: The Unity and Diversity of Life
15th Edition
ISBN: 9780357093795
Author: STARR
Publisher: CENGAGE LEARNING (CUSTOM)
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Chapter 27, Problem 11SQ
Summary Introduction
Concept introduction: Root hair is the hair-like outgrowth of a plant root that absorbs the water and minerals from the soil. The important function of the root hairs is the collection of water and mineral nutrients present in the soil and takes them through the roots to the rest of the body. The root hairs do not have chloroplast as it does not carry out photosynthesis.
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Root hairs____ . a. conduct water from cortex to aboveground shoots b. increase the root’s surface area for absorption c. anchor the plant in soil
Is water primarily pushed or pulled up the plant?
A. Push
B. Pulled
Water transpires primarily from?
A. Only open stomata
B. Entire leaf surface
C. All stomata
With stomata closed, a waterproof cuticle______ . a. minimizes water loss through plant surfaces b. permits gas exchange between the plant and the air c. both a and b
Chapter 27 Solutions
Biology: The Unity and Diversity of Life
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- In roots, growth of lateral branches beginsa. on the root epidermis.b. on the root hairs.c. at the ground meristem.d. at the pericycle.arrow_forwardThe ________ forces selective uptake of minerals in the root. a. pericycle b. epidermis c. endodermis d. root caparrow_forwardPlant bends towards the source of light on account of the movement of curvature known as: A. geotropism B. thigmotropism C. chemotropism D. phototropismarrow_forward
- Roots differ from stems because roots lack a. vessel elements. b. nodes. c. an epidermis. d. ground tissue.arrow_forwardWhich plant organ exhibits only determinate growth? a. root b. stem c. leaf d. all organs above only grow determinatelyarrow_forwardA difference between monocot and dicot plant stems is thea. absence of buds in monocots.b. organization of vascular tissue.c. presence of guard cells.d. absence of stomata.arrow_forward
- Minerals dissolved in watera. enter root epidermal cells by active transport.b. take an extracellular pathway through roots to thevascular cylinders.c. are transported up through phloem to the leaves.d. enter root cortex cells by diffusion.arrow_forwardGuard cellsa. are found primarily on the upper surface of leaves.b. open their stomata by shrinking.c. lack chloropolasts.d. close in response to abscisic acid.arrow_forwardStomata are usually opena. at night, when the plant requires a supply of oxygen.b. during the day, when the plant requires a supply of carbondioxide.c. day or night if there is excess water in the soil.d. during the day, when transpiration occurs.e. Both b and d are correct.arrow_forward
- Choose the incorrect statement: a. Fusiform and ray initials are formed by the vascular cambium. b. The cork cambium produces the periderm layer, a thicker tougher outer layer that replaces the epidermis. c. Wood is composed of secondary xylem. d. The vascular cambium separates the xylem on the outside of the stem and the phloem on the inside.arrow_forwardAfter sucrose enters sieve tubes,a. it is removed by the source.b. water follows passively by osmosis.c. it is driven by active transport to the source, which is usuallythe roots.d. stomata open so that water flows to the leaves.e. All of these are correct.arrow_forward
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