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Question
Water is one of the required reactants for photosynthesis. It provides electrons that are energized by sunlight and used to make energy carriers like ATP. Where do plants get the water they need for photosynthesis?
Responses
A Plants take in water from the air through their stems.Plants take in water from the air through their stems.
B Plants take in water from the soil through their roots.Plants take in water from the soil through their roots.
C Plants take in water from the air through their leaves.Plants take in water from the air through their leaves.
D Plants take in water from their leaves through th
eir stomata.Plants take in water from their leaves through their stomata.
e stomata.
To answer the question, "Where do plants get the water they need for photosynthesis?" we need to understand how plants absorb water.
Plants primarily obtain water for photosynthesis from the soil through their roots. The roots of the plant have tiny hair-like structures called root hairs that increase the surface area for water absorption. These root hairs are in close contact with the soil particles, allowing them to take up water through a process called osmosis. Osmosis is the movement of water molecules from an area of higher concentration (the soil) to an area of lower concentration (the root cells) through a semi-permeable membrane.
Once water is absorbed by the roots, it travels through the plant's vascular system, which consists of xylem and phloem tissues. The xylem is responsible for transporting water and minerals from the roots to the leaves. The water molecules move in a continuous flow from the roots to the leaves through a process called transpiration.
The leaves of the plant also play a role in water absorption, although it is not the primary source. Plants have small openings on the surface of their leaves called stomata. Stomata can open and close to regulate the exchange of gases, including water vapor. In certain situations, such as during periods of high humidity or water scarcity, plants can take in small amounts of water vapor from the air through their stomata. However, this method of acquiring water is not sufficient to meet their needs for photosynthesis.
Therefore, the correct answer to the question is B: Plants take in water from the soil through their roots.