Plant Responses to the Environment (Grade 12 NSC Matric Life Sciences): Flashcards
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Geotropism
Geotropism
Plant growth response to gravity
Geotropism in complete darkness
Geotropism in complete darkness
Works without light; plants detect gravity directly
Positive geotropism
Positive geotropism
Growth with gravity (roots grow downward)
Negative geotropism
Negative geotropism
Growth against gravity (shoots grow upward)
Auxins in geotropism
Auxins in geotropism
Plant hormones controlling cell growth and elongation
Auxin distribution when plant horizontal
Auxin distribution when plant horizontal
Auxins accumulate on the lower side
High auxin effect on roots
High auxin effect on roots
Inhibits/slows down root cell growth
High auxin effect on shoots
High auxin effect on shoots
Promotes rapid cell elongation and growth
Auxin effects: roots vs shoots
Auxin effects: roots vs shoots
Opposite: inhibits roots, promotes shoots
Geotropism in germinating seeds
Geotropism in germinating seeds
Ensures proper orientation regardless of seed position