Question 5 Which molecular forces are more important for phloem transport? Selec
ID: 277281 • Letter: Q
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Question 5 Which molecular forces are more important for phloem transport? Select all that apply O Cohesion of water molecules to one another Adhesion of water molecules to other surfaces O Turgor pressure O Changes in tonicity uestion6 During phloem transport, which of the following occur at, or close to the sink? Select all that apply O Sugars move out of sieve tubes by active transport Sugars move into sieve tubes by active transport O Water moves from the xylem into the sieve tubes Water moves from phloem into the xylem Solution in sieve tubes becomes hypertonic Solution in sieve tubes becomes hypotonicExplanation / Answer
Hi Answer:
Q. 5.Which molecular forces are more important for phloem transport
Answer: Option C (Turgor pressure)
Explanation: Phloem transport is the transport of the organic material formed during photosynthesis to the various plant parts. The turgor pressure plays a very important role in phloem transport mechanism. Turgor pressure is actual pressure developed by a fluid in plant cell and it is exerted on the plant cell wall. This pressure helps in the transportation of phloem content by maintaining the maximum pressure in the cells
Q.6.During phloem transport, which of the following occur at, or close to the sink? Select all that apply
Answer: Option B (Sugars move into sieve tubes by active transport)
Explanation: During active phloem transport the energy obtained from the photosynthesis push the sugars to moves into the sieve tubes and at the same time water content in the tubes moves out by passive transport i.e. osmosis which reduced the pressure inside the tubes.
Q. 7. Which molecular forces are more important for xylem transport? Select all that apply
Answer: Option A and B (Cohesion of water molecules to one another & Adhesion of water molecules to other surfaces)
Explanation: The xylem transport is a movement of water from roots to all parts of the plant. The water molecules move upwards with the cohesion forces (attraction between water molecules) and adhesion forces (attraction between water molecules and surface). These both forces help in the xylem transportation.
Q.8.Which of the following indicates conditions in which stomata will close
Answer: Option D (At midday in a hot and dry environment).
Explanation: Stomata’s are the tiny pores present on the leaves of plants. They allow plants to exchange the gases which are necessary for cellular activities. There is also water loss by the stomata. At the hot and dry environment, the stomata will be remained close to protect from excessive water loss.
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