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Lectures 27 & 28: Sensing environment, continued & Intro to…
Lectures 27 & 28: Sensing environment, continued & Intro to Reproduction
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Efferent neurons—carry commands to physiological and behavioral effectors such as muscles and glands
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There are conscious and unconscious afferents, and voluntary & autonomic efferents
Plant Light detection
Phototropism- detects blue light; causes seedling elongation, stomatal opening as result of light, solar tracking
Red/Far red light; involved in Photoperiodism, Shade detection & avoidance, Germination response to increased light
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Far red light elicits growth response b/c other plants only block red light. This response occurs by changing gene transcription
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The relative lengths of the diploid and haploid portions of life cycles (and size of the structures) differ across organisms with sexual reproduction
As land plants evolved, increasing dependence of gametophyte on sporophyte
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Seed anatomy: seed coat, food tissue, embryo from fertilization (young sporophyte)
Pollen grain contains 2 sperm nuclei, one cell that produces pollen tube
Flower anatomy
Carpel (Stigma, style, ovary)
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Ovules become seeds, ovaries become fruits
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