Answer: Auxin is a plant growth-promoting hormone involved in all the mechanisms related to plant growth. Mainly three tropisms that are crucial for overall plant growth have been analyzed, which include phototropism (movement towards light), hydrotropism (movement towards moisture), and gravitropisRead more
Answer:
Auxin is a plant growth-promoting hormone involved in all the mechanisms related to plant growth. Mainly three tropisms that are crucial for overall plant growth have been analyzed, which include phototropism (movement towards light), hydrotropism (movement towards moisture), and gravitropism (movement towards gravity). Interestingly, auxin plays an integral role in all three tropisms. In the case of hydrotropism, auxin accumulates the lower side of the roots (near root cap) in response to moisture and sends signals to the elongation part of the root to increase the root cell growth, resulting in the development of deeper roots to obtain the moisture or water.
In the case of phototropism, in response to light, auxin accumulates more at the shadow side of the stem and then induces cell division and growth. Due to this lop-sided growth (overgrowth at shadow side) stem bends towards a light to obtain more light in order to increase the rate of photosynthesis.
Auxin is an important plant hormone available in different forms including indole-3-acetic acid, indole-3-propionic acid, indole-3-butyric acid, phenylacetic acid, and 4-chloroindole-3-acetic acid. They all are responsible for various growth-related traits in almost all plants. The growth of any plaRead more
Auxin is an important plant hormone available in different forms including indole-3-acetic acid, indole-3-propionic acid, indole-3-butyric acid, phenylacetic acid, and 4-chloroindole-3-acetic acid. They all are responsible for various growth-related traits in almost all plants. The growth of any plant is based on cell number and cell growth. Hence the plant growth properties of these hormones could directly induce cell division, cell growth, and cell elongation. In addition, these endogenous auxins also play other roles especially in cell differentiation, apical dominance (is a condition in which the main shoot dominates and inhibits the growth of other parts of the plant), and phototropism (which is a phenomenon in which plant stem bends towards light).
Answer: Simple ions (enter the cell by facilitated diffusion). @Water molecules and Alcohol (enter the cell by simple diffusion). @Proteins (enter the cells by active transport). Explanation: Before going to the complete answer, first, we learn what is diffusion and how many types of diffusion are tRead more
Answer: Simple ions (enter the cell by facilitated diffusion).
@Water molecules and Alcohol (enter the cell by simple diffusion).
@Proteins (enter the cells by active transport).
Explanation:
Before going to the complete answer, first, we learn what is diffusion and how many types of diffusion are there in biological systems?
Diffusion is a process by which biological molecules enter the cell from the region of their higher concentrations to their lower concentrations through the plasma membrane (downhill). Diffusion does not require energy; hence it is thermodynamically favorable.
Diffusion is mainly divided into two types based on the involvement of membrane proteins which include simple and facilitated diffusions.
1) In simple diffusion, molecules cross the membrane without membrane-bound proteins or channels. Simple diffusion examples: Small and non-polar molecules such as Water, Alcohol, Oxygen, Urea, Carbon dioxide, etc.
2) In facilitated diffusion, molecules reach the cytoplasm with the help of membrane proteins. Simple diffusion examples: Large and charged (polar) molecules like sugars and amino acids.
There is another process called active transport through which large polar and non-polar molecules will be entered the cell from their lower concentrations to their higher concentrations (uphill) through plasma membrane using membrane proteins (here we call them transporters instead of channels). Active transport requires energy to transporting any molecules against their gradient, hence it is thermodynamically unfavorable.
Explain how auxins could cause hydrotropism.
Answer: Auxin is a plant growth-promoting hormone involved in all the mechanisms related to plant growth. Mainly three tropisms that are crucial for overall plant growth have been analyzed, which include phototropism (movement towards light), hydrotropism (movement towards moisture), and gravitropisRead more
Answer:
See lessAuxin is a plant growth-promoting hormone involved in all the mechanisms related to plant growth. Mainly three tropisms that are crucial for overall plant growth have been analyzed, which include phototropism (movement towards light), hydrotropism (movement towards moisture), and gravitropism (movement towards gravity). Interestingly, auxin plays an integral role in all three tropisms. In the case of hydrotropism, auxin accumulates the lower side of the roots (near root cap) in response to moisture and sends signals to the elongation part of the root to increase the root cell growth, resulting in the development of deeper roots to obtain the moisture or water.
In the case of phototropism, in response to light, auxin accumulates more at the shadow side of the stem and then induces cell division and growth. Due to this lop-sided growth (overgrowth at shadow side) stem bends towards a light to obtain more light in order to increase the rate of photosynthesis.
What do Auxins control in plants?
Auxin is an important plant hormone available in different forms including indole-3-acetic acid, indole-3-propionic acid, indole-3-butyric acid, phenylacetic acid, and 4-chloroindole-3-acetic acid. They all are responsible for various growth-related traits in almost all plants. The growth of any plaRead more
Auxin is an important plant hormone available in different forms including indole-3-acetic acid, indole-3-propionic acid, indole-3-butyric acid, phenylacetic acid, and 4-chloroindole-3-acetic acid. They all are responsible for various growth-related traits in almost all plants. The growth of any plant is based on cell number and cell growth. Hence the plant growth properties of these hormones could directly induce cell division, cell growth, and cell elongation. In addition, these endogenous auxins also play other roles especially in cell differentiation, apical dominance (is a condition in which the main shoot dominates and inhibits the growth of other parts of the plant), and phototropism (which is a phenomenon in which plant stem bends towards light).
See lessWhich of the following is most likely to move through the cell membrane by facilitated diffusion?
Answer: Simple ions (enter the cell by facilitated diffusion). @Water molecules and Alcohol (enter the cell by simple diffusion). @Proteins (enter the cells by active transport). Explanation: Before going to the complete answer, first, we learn what is diffusion and how many types of diffusion are tRead more
Answer: Simple ions (enter the cell by facilitated diffusion).
@Water molecules and Alcohol (enter the cell by simple diffusion).
@Proteins (enter the cells by active transport).
Explanation:
Before going to the complete answer, first, we learn what is diffusion and how many types of diffusion are there in biological systems?
Diffusion is a process by which biological molecules enter the cell from the region of their higher concentrations to their lower concentrations through the plasma membrane (downhill). Diffusion does not require energy; hence it is thermodynamically favorable.
Diffusion is mainly divided into two types based on the involvement of membrane proteins which include simple and facilitated diffusions.
1) In simple diffusion, molecules cross the membrane without membrane-bound proteins or channels. Simple diffusion examples: Small and non-polar molecules such as Water, Alcohol, Oxygen, Urea, Carbon dioxide, etc.
2) In facilitated diffusion, molecules reach the cytoplasm with the help of membrane proteins. Simple diffusion examples: Large and charged (polar) molecules like sugars and amino acids.
There is another process called active transport through which large polar and non-polar molecules will be entered the cell from their lower concentrations to their higher concentrations (uphill) through plasma membrane using membrane proteins (here we call them transporters instead of channels). Active transport requires energy to transporting any molecules against their gradient, hence it is thermodynamically unfavorable.
See less