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3 years ago

Which of these is NOT an interaction between a plant's root and shoot systems?

Biology

1 answer:

olga_2 [115]3 years ago

4 0

Answer:

The stomata open to allow carbon dioxide to enter the leaves.

Explanation:

Higher plants are made up of two major system parts namely: shoot system and root system. The shoot system constitutes every part of the plant above the ground i.e leaves, fruits, stem etc. while the root system constitutes the part below ground i.e the roots. The shoot system and root system, however, interacts in several ways to ensure that the plant functions optimally. The ways they interact include:

- The roots (root system) absorb water from the soil, which is transported upwards to prevent leaves (shoot system) from drying up.

- The phloem, which is a conducting tissue, transports sugars (product of photosynthesis) from the leaves (shoot system) to the root nodules (root system) for storage.

- Nutrients are absorbed from the soil by the roots (root system) and moved to the stems (shoot system).

Note that, although it is true that "stomata in the leaves open to allow carbon dioxide to enter the leaves", there is no connection between the shoot and root system.

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2.86 A ball is dropped from rest from the top of a cliff that is 24 m high. From ground level, a second ball is thrown straight

Rashid [163]

Answer:

Distance Below the top = 6,02 m

Explanation:

To get the Final velocity of the first ball (that will be the intial velocity of the second) you need to solve the kinematic equation for Velocity:

(1) $V_{1f} =V_{1O} - gt$

As the ball is dropped from rest $V_{1O} = 0$ , so:

(2) $V_{1f} = - gt$

Note that the velocity is going to be negative as the ball is going down. To get the time it would take the ball to reach de base you can use the kinematic equation for position:

(3) $h_{1} = h_{1O} + V_{1O} *t - \frac{1}{2} gt^{2}$

We need the answer when h=0, and from the initial conditions $V_{1O} = 0, h_{1O} = 24m$ , you get:

(4) $24m = \frac{1}{2} gt_{1f}^{2}$

Solving for t, with $9,8\frac{m}{s^{2}}$ and :

(5) $t_{1f} = \sqrt{\frac{24m*2}{g} } = 2,21 s$

Replacing this time in (2), the final velocity is:

(6) $V_{1f} = -21,66 \frac{m}{s}$

So the initial velocity of ball 2 is equial to this but oppossite in direction so: $V_{2O}= -V_{1f} = 21,66 \frac{m}{s}$

The general position equation for ball 2 is (considering $h_{2O} = 0$ :

(7) $h_{2} = V_{2O} *t - \frac{1}{2} gt^{2}$

They cross paths when $h_{1}=h_{2}$ so:

(8) $h_{1O} - \frac{1}{2} gt^{2} = V_{2O} *t - \frac{1}{2} gt^{2}$

Rearranging:

(9) $t_{cross} =\frac{h_{1O}}{V_{2O} }$

Replacing values:

$t_{cross} = 1,108 s$

To get the absolute position replace $t_{cross}$ on equation (3) or (7):

$h_{cross} = 17,98 m$

To get it below the top of te cliff:

$h_{cross, from above} = 24 m - 17,98 m$

$h_{cross, from above} = 6,02 m$

3 0

4 years ago

If the chromosomes that determine gender had been a part of this activity, which allele (X or Y) would have determined the gende

katrin2010 [14]

Answer:

Y chromosome

Explanation:

The presence of the Y chromosome indicates a male, whereas the absence of it indicates a female.

6 0

3 years ago

Scenario 2:

Akimi4 [234]

Answer:

I think he should undergo the DNA test.

Explanation:

Taking this DNA test could help Mike understgand his genetic makeup. If he does not take the test then he will forever wonder about his genetic makeup.

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3 years ago

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Which memory test would most effectively reveal that mr. marchman, at age 65, still remembers many of his high school classmates

Sladkaya [172]

<span>The memory test that would most effectively reveal that mr. marchman, at age 65, still remembers many of his high school classmates, is RECOGNITION test. </span>Recognition memory <span>is the ability to recognize previously encountered events, objects, or people.</span>

6 0

4 years ago

In a strand of DNA, if the percentage of thymine is 30%, what would the percentage of cytosine in the same DNA strand be?

erma4kov [3.2K]

Answer:

20% cytosine

Explanation:

Their is 30% thymine and a total of 30% adenine, and there is 20% cytosine and 20% guanine.

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3 years ago

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