Download 10B Interactions in Plants

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Review
B.10B: Interactions in Plants
B.10B: Describe the interactions that occur among systems that perform the functions of
transport, reproduction, and response in plants.
✪ Readiness Standard
1. The transport of materials in plants is unified by a system of subterranean parts
(roots) and aerial parts (leaves, stems, and flowers). Vascular tissues transport
materials; xylem transports water and dissolved minerals from the roots into the
shoots; and phloem transports manufactured sugars from the leaves to the nonphotosynthetic roots.
2. Water and gas exchange is imperative for plant growth. Water is transported
from the roots to the leaves and is transpired out of the leaves, mostly through
guard cells, which allow carbon dioxide to enter the plant and expel oxygen.
3. Plants communicate to other plants (through hormones) and respond to their
environment. Even though plants are sessile, they respond directionally to light
(phototropism) and gravity (gravitropism). Mineral deficiencies reflect soil
composition and the functions nutrients provide for plants.
4. The sexual life cycle of plants involves alternation of haploid and diploid
generations. Haploid gametophytes (1n) produce gametes by mitosis that form
diploid (2n) zygotes through fertilization and then 2n sporophytes through
mitosis. The diploid sporophyte produces haploid spores by meiosis, which creates
gametophytes through mitosis.
5. Water and gas exchange is imperative for plant growth. Water is transported
from the roots to the leaves and is transpired out of the leaves, mostly through
guard cells, which allow carbon dioxide to enter the plant and expel oxygen.
Vocabulary
angiosperm, anther, auxins, dicot, filament, gametophyte, germination, gravitropism,
guard cells, gymnosperm, monocot, ovary, phloem, phototropism, pistil, pollen,
pollination, seed, sepal spore, sporophyte, stamen, stigma, stoma, style, taproot,
thigmotropism, transpiration, turgor pressure, vascular tissue, xylem
Fundamental Questions
Use the Key Concepts information as well as the information in your Stemscopedia
beginning on page 125 to answer the fundamental questions below.
1. How do the systems in a plant interact to transport water and nutrients?
2. How do the systems in a plant interact to reproduce?
3. How do the systems in a plant interact to respond to its environment?
4. What is the role of homeostasis in plant system interactions?
Analysis
Complete the following in the space provided.
1) Explain how plants maintain homeostasis.
2) Describe what is meant by alternation of generations in plants.
3)
Explain how xylem and phloem are involved in transporting water and food.