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37 Cards in this Set
- Front
- Back
which factors affect the rate of diffusion?
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1. concentration differences across a barrier
2. resistance of the barrier 3. area of the barrier |
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what structure connects the cytoplasm of adjacent cells?
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plasmodesmata
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what are the three types of plant cells?
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parenchyma, collenchyma, sclerenchyma
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the xylem is composed of what cells?
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fibers, tracheids, vessels element, rays
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the phloem is composed of what cells?
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sieve tube companion cell, fiber
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ray flowers in a composite head are usually
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sterile
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what gives rise to secondary growth?
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vascular cambium
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cotton is derived from what mature cells
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fibers
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the stem between nodes is called the:
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internode
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the emerging stem of a hypogeal seed is called the:
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epicotyl
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monocot stems have:
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scattered vascular bundles
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in response to evolution, plants do what?
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modify and adapt existing structures
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why does the root quickly emerge from a germinating seed?
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to absorb water
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where are root hairs formed?
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zone of cell maturation
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branch roots arise from the:
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pericycle
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root hairs arise from the:
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epidermis
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what protects the emerging leaves in the germinating monocot grass seed?
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coleoptile
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what protects the emerging root in the germinating monocot grass seed
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coleorhiza
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what is the function of the endosperm?
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nourish the developing embryo
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what is a fruit?
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an ovary and associated tissues
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what is a reproductive flower part out of the following: pedicel, receptacle, sepals, petals, pistil
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pistil
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what are the four most common gases in the atmosphere?
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carbon dioxide, oxygen, nitrogen, argon
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what are ubiquitous energy carriers in all living organisms?
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ATP & NADH
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what characterizes a domesticated plant?
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high yields, large size, easy to store, uniform germination
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the second law of thermodynamics states:
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entropy increases
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what two statistics are used to describe a population?
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mean and standard deviation
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which crops did not originate in the americas?
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rice
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what is essential for the formation of a successful graft union?
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formation of a continuous vascular cambium
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specialized structures in the monocot grass seed:
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coleoptile, coleorhiza, aleurone layer, scutellum
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functions of a seed
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dispersal, reproduction, replication, protection
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bottom part of a graft is called:
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stock
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a breeding line is identical in which genes?
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selected genes
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hypogeal and epigeal are two forms of:
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seedling emergence
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what characterizes a seed?
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an embryo, nutritive tissue, protective structure
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what is alternation of generations?
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alternation between haploid and diploid phases
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perfect flowers must have what parts?
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pistil and stamen
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A corn plant is an example of a:
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monoecious plant
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