Roots and Shoots quiz #3 Flashcards
Roots and Shoots quiz #3
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Describe the difference between a taproot and adventitious roots, and provide an example of a plant with each type.
A taproot is the main dominant root from which lateral roots branch, as seen in carrots. Adventitious roots arise from the shoot system rather than the root system, such as the aerial roots of fig trees or the prop roots of corn. How do stomata and guard cells regulate gas exchange and water loss in leaves?
Stomata are pores in the leaf surface that allow gas exchange. Guard cells surround each stoma and control its opening and closing by changing turgidity, which is regulated by the movement of potassium ions and water. When guard cells are turgid, the stoma opens for gas exchange; when they lose turgidity, the stoma closes to reduce water loss. Give two examples of modified plant structures and explain their adaptive advantages.
Prop roots (modified roots) provide extra support for plants like mangroves and corn. Cactus spines (modified leaves) reduce water loss and protect against herbivores, while cactus stems are modified for water storage. What is the main difference between a taproot and adventitious roots, and give an example of a plant with each type?
A taproot is the main dominant root from which lateral roots branch, as seen in carrots. Adventitious roots arise from the shoot system, such as the aerial roots of fig trees or the prop roots of corn. How do stomata and guard cells regulate gas exchange and water loss in leaves?
Stomata are pores in the leaf surface that allow gas exchange, and guard cells control their opening and closing by changing turgidity. When guard cells are turgid, the stoma opens for gas exchange; when they lose turgidity, the stoma closes to reduce water loss. Name two examples of modified plant structures and explain their adaptive advantages.
Prop roots (modified roots) provide extra support for plants like mangroves and corn. Cactus spines (modified leaves) reduce water loss and protect against herbivores. What are the two main functions of roots in plants?
Roots primarily absorb water and nutrients from the soil and anchor the plant into the ground. They can also store materials produced in the shoots for later use. What is the function of the stem in the shoot system, and what are nodes and internodes?
The stem supports vertical growth and positions leaves for optimal light absorption. Nodes are points where leaves and buds grow, while internodes are the spaces between nodes. Describe the structure and function of the leaf, including the roles of the petiole and blade.
The leaf consists of a petiole (the stalk connecting the leaf to the stem) and a blade (the broad, flat part). Leaves are the main sites of photosynthesis and gas exchange in vascular plants. What is phenotypic plasticity in plants, and how does it relate to modified plant structures?
Phenotypic plasticity is the ability of plants to modify their basic structures (roots, stems, leaves) for different functions. This allows plants to adapt to diverse environments by developing structures like prop roots, tubers, or spines.
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