Ch 10 - Life Processes in Plants7th Science
Indicators of Plant Growth
Unlike animals, how do plants physically manifest their growth continuously throughout their life span?
Unlike animals, how do plants physically manifest their growth continuously throughout their life span?
- Emergence: They continuously develop new leaves and branches from meristematic tissues.
- Extension: Their overall height and root depth increase (primary growth).
- Girth: Their central stem and roots actively thicken over time (secondary growth).
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Essential Factors for Growth
What are the core external environmental resources a plant absolutely requires to successfully grow and survive?
What are the core external environmental resources a plant absolutely requires to successfully grow and survive?
Plants require three primary external factors:
- Water: Absorbed from the soil, keeping the plant hydrated and acting as a crucial medium for internal transport and biochemical reactions.
- Sunlight: The ultimate source of energy utilized to synthesize food.
- Nutrients (Minerals): Absorbed from the soil (e.g., Nitrogen, Phosphorus) to support critical structural and cellular development.
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Structural Adaptation of Leaves
From a functional and geometric perspective, why has evolution structurally designed the majority of plant leaves to be broad and flat (lamina)?
From a functional and geometric perspective, why has evolution structurally designed the majority of plant leaves to be broad and flat (lamina)?
- Maximum Surface Area: A broad, flat shape drastically increases the total exposed physical area of the leaf.
- Efficiency: This maximizes the plant's ability to absorb sunlight across a wider plane and provides extensive space for stomata, facilitating a much higher and faster rate of gas exchange ( in, out) required for photosynthesis.
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Also in this chapter
28 more cards to study in Prism
- 4Photosynthesis
- 5Role of Chlorophyll
- 6Photosynthesis Word Equation
- 7Photosynthesis in Non-Green Leaves
- 8Stomata
- 9Microscopic Observation of Stomata
- 10Glucose vs. Starch
- 11Testing for Photosynthesis (Iodine Test)
- 12Decolourisation of Leaves
- 13Darkness vs. Plant Growth
- 14Sunlight without Water
- 15Plant Respiration Equation
- 16Role of Caustic Soda/Potash in Experiments
- 17Function of Roots and Root Hairs
- 18Role of Xylem Tissue
- 19Visualizing Water Transport (Coloured Water)
- 20Transpiration
- 21Role of Phloem Tissue
- 22Xylem vs. Phloem
- 23Translocation to Storage Organs (Potato)
- 24Respiration in Plants
- 25Timing: Photosynthesis vs. Respiration
- 26Gas Exchange Reversal
- 27Testing Plant Respiration (Lime Water)
- 28Snail and Water Plant Experiment
- 29Balance in Nature
- 30The Bottle Garden (Terrarium) Principle
- 31Contributions of Kamala Sohonie
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