Question 1

What is the process of water uptake in plants?

Accepted Answer

Water uptake in plants primarily occurs through the roots. The process involves osmosis, where water moves from the soil, which has a higher water potential, into the root hair cells, which have a lower water potential. This is a key concept in the Cambridge IGCSE Biology curriculum under the topic of Transport in Plants.

Question 2

How do root hair cells facilitate water uptake in plants?

Accepted Answer

Root hair cells increase the surface area of roots, allowing for more efficient absorption of water and minerals from the soil. These cells are adapted for water uptake by having thin cell walls and a large surface area, which enhances the osmosis process, a crucial point in the Cambridge IGCSE Biology syllabus.

Question 3

What role does osmosis play in the water uptake of plants?

Accepted Answer

Osmosis is the movement of water molecules from an area of higher water potential to an area of lower water potential through a semi-permeable membrane. In plants, osmosis allows water to move from the soil into the root hair cells, which is essential for maintaining cell turgor and nutrient transport, as outlined in the Cambridge IGCSE Biology curriculum.

Question 4

Why is water uptake important for plant survival?

Accepted Answer

Water uptake is vital for plant survival as it helps maintain cell turgor, which keeps plants upright and supports photosynthesis by providing the necessary medium for nutrient transport. Additionally, water is a reactant in photosynthesis, making it essential for plant growth and energy production, a key concept in Cambridge IGCSE Biology.

Question 5

What factors affect the rate of water uptake in plants?

Accepted Answer

Several factors can affect the rate of water uptake in plants, including soil water availability, temperature, humidity, and root surface area. For instance, dry soil or high temperatures can reduce water uptake, while a larger root surface area can enhance it. Understanding these factors is crucial for Cambridge IGCSE students studying Transport in Plants.

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