1. Which cell component shapes plant cells into their characteristic square? cen
ID: 257760 • Letter: 1
Question
1. Which cell component shapes plant cells into their characteristic square?
central vacuole
plasma membrane
cell wall
2. ________ arise from ground tissue.
Bark
Stems
Root tips
3. In plants, water moves from areas of ________ water potential to areas of ________ water potential in an attempt to equilibrate.
lower; higher
shallower; deeper
higher; lower
4. The main driver of ________ is transpiration.
water movement through xylem
water movement through phloem
solute movement through xylem
5. ________ is the movement of a plant in response to constant directional pressure.
Thigmotropism
Thigmonastism
Thigmomorphogenesis
Explanation / Answer
1. Cell component shapes plant cells into their characteristic square is Cell wall.
Cell wall is made up of cellulose and it gives protection to the cell. It also helps in giving Definate shape to the cell.
2. Bark arise from ground tissue. Ground tissue is the tissue other than epidermis, endodermis, pericycle, vascular tissues. In the young plants major part of the stem is filled with ground tissue. But after secondary growth major part of the plant stem is filled with Xylem and phloem, so vascular tissue is the major part in old stems. Bark is developed from cambium that adds up more parenchymal cells that is considered as ground tissue.
Root tip consisting of only meristamatic tissue and is not ground tissue. Stem consisting of ground tissue and vascular tissues. And is not arises from ground tissue.
3. In plants water moves from areas of higher water potential to areas of lower water potential in an attempt to equilibrate.
More water potential means more free energy, that means water molecules have tend to move towards low water potential where free energy is less.
4. The main driver of water movement through xylem is transpiration.
Absorption and movement of water in xylem is driven by the pulling force created during transpiration called as transpiration pull. More transpiration means more water absorbs and more water transported in xylem.
5. Thigmomorphogenesis is the movement of plant in response to constant directional pressure. It is seen in plants due to the wind flow in particular direction continuously leads to change in the growth pattern of plant. Some times it leads to formation of flagtrees.
Thigmotropism and thigmonansty are due to the response shown by the plants for a temporary stimulus like touch.
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