1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Annette [7]
3 years ago
14

When plants are stressed by dry conditions, they secrete the hormone abscisic acid (ABA) and in response the stomata close, even

in the light. ABA is known to trigger the release of calcium ions that serve as second messengers in the guard cells and cause massive opening of potassium (K ) channels. Which of the following would be part of the mechanism by which ABA triggers stomata to close?
A. K+ ions flow out of guard cells and water moves into guard cells in response
B. K+ ions flow into guard cells and water moves into guard cells in response
C. K+ ions flow out of guard cells and water moves out of guard cells in response
D. K+ ions flow into guard cells and water moves out of guard cells in response
Biology
2 answers:
sleet_krkn [62]3 years ago
5 0

Answer:

K+ ions flow out of the guard cells and water moves out of the guard cells in response

Explanation:

When the Stomatal opens and closes it is occurs as a result of the absorption and removal of water into and from the guard cells respectively. K + ions have a huge role to play in this.

When it opens huge amounts of potassium ions accumulate in the guard cells which increases the solute potential and hence the water potential is dropped. This causes water from neighbouring cells to enter the guard cell and they become turgid or swollen. In this condition, the stomatal pore is opened. This is the opposite phenomenon of opening when it closes as water is removed from the guard cells and they become flaccid. K + ions move out of the cell. This causes the stomatal pore to close. This occurs in the absence of light or when rates of photosynthesis are low. In this condition the stomatal pore is closed.

dimaraw [331]3 years ago
4 0

Answer:

C. K+ ions flow out the the guard cells and water flows out the cells.

Explanation:

The turgidity of the guard cells allows the opening and closing of the stomata. This is especially necessary when it comes to water conservation in plants. In order for the cells to become turgid or flaccid, there must be the influx and out ward movement of water via osmosis.

In order for this the occur the osmotic pressure of the cellular environment must change and this is done by changing the solute concentration.

The pumping in of K+ ions out the cell allows the solute concentration to decrease and this in turn encourages the movement of water across a concentration gradient through a semi-permiable membrane.

The water leaves the guard cells and they become flaccid. This causes the stomata to be covered.

You might be interested in
Mrs. Jorgensen keeps a flock of chickens in her back yard. One of the roosters is the result of selective breeding by Mrs. Jorge
elena-14-01-66 [18.8K]

Answer:

Ostrich nevermind dont put  that

Explanation:

5 0
3 years ago
What is the current theory about the formation of the solar system?
Blizzard [7]

nebular hypothesis

The most widely accepted theory of planetary formation, known as the nebular hypothesis, maintains that 4.6 billion years ago, the Solar System formed from the gravitational collapse of a giant molecular cloud which was light years across. Several stars, including the Sun, formed within the collapsing cloud.

7 0
3 years ago
Read 2 more answers
Which step is a protein formed during gene expression?
Finger [1]
D. DNA replication

DNA always forms proteins
7 0
2 years ago
The Neanderthal skeleton known as the "old man" showed evidence of many injuries over a long life. Several broken bones had heal
Citrus2011 [14]
The answer is C: <span>The Neanderthals cared for the wounded and the elderly. The fact that the skeleton showed signs of broken bones that had healed indicated that the individual had been nurtured back to health after injury. The loss of teeth showed that the individual had lived to an old age.</span>
3 0
3 years ago
1.
tensa zangetsu [6.8K]

Answer:

B

Explanation:

7 0
3 years ago
Other questions:
  • Hormones released during exercise that can cause a person to get a "physical high" are known as
    13·1 answer
  • Which best describes reproduction
    11·1 answer
  • Circular rings of smooth muscle that can contract to regulate the movement of food through the gastrointestinal tract are called
    14·1 answer
  • What gas do some scientist think was missing from earths early atmosphere
    5·1 answer
  • Write the Cu half reaction that takes place on the Fe electrode as Cu is dissolved.
    11·1 answer
  • What do the results suggest about ways that milkweed bug populations are limited in nature?
    8·1 answer
  • Part of a molecule found in cells is represented below.
    11·1 answer
  • HELP ME PLEASE Question 3 of 10
    15·1 answer
  • Nuestro planeta esta habitada por numerosas ____, muchas de ellas extendidas en grandes y diversas zonas. Sin embargo, existen e
    9·1 answer
  • What is one food that contains complex<br> carbohydrates?
    13·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!