Please watch this video: https://www.youtube.com/watch?v=LQ03xIkLLQU&feature=you
ID: 166835 • Letter: P
Question
Please watch this video: https://www.youtube.com/watch?v=LQ03xIkLLQU&feature=youtu.be
How would you answer these questions after watching the video?
Activity 1-The xylem and phloem in roots
1. which direction do the blue water molecules travel in the system?
2. which way do the red sugar molecules travel?
3. which vessles are biggest, the red xylem or the yellow phloem?
Activity 2-The xylem and phloem in a stem
1. which way do the blue water molecules travel to get into the xylem? Do they go through cell cytoplasm or cell walls, or both?
2. which way do the red sugar molecules travel?
3. Why do some red sugar molecules disappear in the blue parenchyma cells?
Activity 3-The xylem and phloem in a leaf
1. Where do the red sugar molecules appear first? Explain why.
2. Do you ever see red sugar molecules in the red xylem tubes? Explain your answer.
3. How do most water molecules leave the leaf?
Explanation / Answer
Activity 1-The xylem and phloem in roots
1. which direction do the blue water molecules travel in the system? - from down to upward means from roots to leaves
2. which way do the red sugar molecules travel? - from leaf to roots
3. which vessles are biggest, the red xylem or the yellow phloem? - the red xylem
Activity 2-The xylem and phloem in a stem
1. which way do the blue water molecules travel to get into the xylem? Do they go through cell cytoplasm or cell walls, or both? - The water either goes through the cortex cells (between the root cells and the xylem vessels) or it bypasses them – going through their cell walls.
2. which way do the red sugar molecules travel? - downward from leaves to stem
3. Why do some red sugar molecules disappear in the blue parenchyma cells? - because parenchyma cells are living cells, and used for Storage of starch, protein, fats, oils and water in roots, tubers (e.g. potatoes), seed endosperm (e.g. cereals) and cotyledons (e.g. pulses and peanuts)
Activity 3-The xylem and phloem in a leaf
1. Where do the red sugar molecules appear first? Explain why.- Palisade cells in leaves, Palisade cells contain the largest number of chloroplasts per cell, which makes them the primary site of photosynthesis in the leaves
2. Do you ever see red sugar molecules in the red xylem tubes? Explain your answer.
3. How do most water molecules leave the leaf? - The last stage in the transpiration stream is the water moving into the leaves, and then the actual transpiration. First, the water moves into the mesophyll cells from the top of the xylem vessels. Then the water evaporates out of the cells into the spaces between the cells in the leaf. After this, the water leaves the leaf (and the whole plant) by diffusion through stomata.