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VladimirAG [237]
3 years ago
7

What is turgor pressure, what causes it, and what does it do for a plant?

Biology
2 answers:
-BARSIC- [3]3 years ago
6 0

Answer:

Sample Response: Turgor pressure is the pressure exerted on the cell wall of a plant. It is caused by the movement of water into the cell. When a plant cell stores substances like ions or sugars, the amount of substances inside and outside the cell are no longer equal. There are more substances inside the cell. This causes water to rush into the cell, increasing the pressure on the cell wall. The cell swells up, helping the plant to stand upright.

Explanation:

ANEK [815]3 years ago
4 0

Turner pressure is simply the force within the plant cell that pushes the cell membrane or plasma membrane against the cell wall.

It is caused by the Osmotic flow of water through the semi permeable membrane.

It helps the plant cells to remain turgid and stand tall so as to prevent it from wilting

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Two insecticides will be compared for their effectiveness in eliminating aphids on tomato plants. Forty tomato plants of the Big
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Answer:

The t-test

Explanation:

<em>The researcher should use a t-test to compare the two means and check if they are significantly different from each other.</em>

In using the t-test, both null (H0) and alternate (H1) hypothesis are made such that:

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Thereafter, the value of t is calculated and compared to its critical value on the table. The formula for calculating the t goes thus:

t = \frac{Y_1 - Y_2}{\sqrt{\frac{S_1}{n_1} + \frac{S_2}{n_2}  } }

where, Y1 = mean of population 1, Y2 = mean of population 2, S1 = variance of population 1, S2 = variance of population 2, n1 = number of individuals in population 1 and s2 = number of individuals in population 2.

<em>At the end of the day, if the calculated t value is more than the critical value of t, the H0 is rejected and it shows that the two means are significantly different. Otherwise, the H0 is accepted and this shows that there is not significant difference between the mean of population 1 and that of 2.</em>

7 0
3 years ago
Why is there variation new organisms formed from the joining of two reproductive cells?
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2 years ago
Which is a mechanism for restricting the movement of proteins in the plasma membrane? Choose one or more:
alexgriva [62]

Answer:

The correct answers are option A. "tethering proteins to the cell cortex", B. "using barriers such as tight junctions", C. "tethering proteins to the extracellular matrix", D. "forming a covalent linkage with membrane lipids", E. "tethering proteins to the surface of another cell"

Explanation:

According to the fluid-mosaic model, the components of cell membranes are in constant movement forming a barrier to avoid unwanted exterior component internalization and to avoid the loss of precious internal components. This constant movement could cause that proteins move across the plasma membrane. But, this is avoided by several mechanisms including:

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B. Using barriers such as tight junctions. Tight junctions are barriers found in epithelia made of claudin and occludin proteins. These barriers are impenetrable, which avoid the movement of proteins in the cell membrane.

C. Tethering proteins to the extracellular matrix. The extracellular matrix is made of several proteins and macromolecules that provide a structural and biochemical support to cells that are nearby. Proteins could be tethered to this rigid structure as well.

D. Forming a covalent linkage with membrane lipids. The proteins in the cell membrane that form a covalent linkage with membrane lipids are known as lipid-anchored proteins, or lipid-linked proteins.

E. Tethering proteins to the surface of another cell. When cell-cell communication take place it is possible that proteins in the cell membrane got tethered to the surface of the other cell.

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</span>
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