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Climate change and trees with contrasting strategies with complete solutions
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Climate change and trees with contrasting strategies with complete solutions
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Climate change and trees withcontrasting strategies
What is turgor loss in plant cells, and how does it impact the plant's physiological function? - correct
answer ✔✔Turgor loss refers to the condition when plant cells lose water and the pressure inside the
cell decreases, causing the plant to lose its rigidity. This impacts the plant's ability to maintain its
structure and carry out essential physiological functions.
Explain the concept of water potential in plant cells. What are the two main factors that determine
water potential? - correct answer ✔✔Water potential in plant cells is a measure of the ability of water to
move from one location to another. It is determined by two main factors: solute concentration (osmotic
potential) and physical pressure (pressure potential).
How does the texture of the soil affect plant water uptake, and why is loam soil more favorable for most
plants compared to clay or sand? - correct answer ✔✔The texture of soil influences plant water uptake.
In clay soils, water is tightly bound to soil particles, making it challenging for plants to extract water. In
sandy soils, water drains quickly, making it less available to plants. Loam soils strike a balance, holding an
adequate amount of water that is easier for plants to access.
Explain the concept of cavitation in plant vessels and why it's a concern for plant survival during drought
conditions. - correct answer ✔✔Cavitation refers to the formation of air bubbles or gaps in plant xylem
vessels due to high tension or negative pressure. It's a concern during drought because it disrupts the
plant's ability to transport water, leading to reduced hydraulic function and potential plant mortality.
What are the adaptations that allow plant species to withstand low water potentials and avoid hydraulic
failure? - correct answer ✔✔Plant species adapt to low water potentials by having traits such as lower
osmotic potentials, which allow them to maintain turgor pressure at lower water potentials. Some plants
also have specialized xylem vessel adaptations. Additionally, they may have higher wood density and
smaller diameter vessels to reduce vulnerability to cavitation.
Do tree species from drier ecosystems exhibit a better ability to withstand higher xylem tensions,
according to the lecture's findings? Explain. - correct answer ✔✔The lecture's findings suggest that tree
species from drier ecosystems have evolved to withstand higher xylem tensions. They have lower
osmotic potentials, which enables them to operate at more negative water potentials, making them
more resilient in drier conditions.
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