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3 years ago

Which of the following is a major force that moves water through the xylem tissues of a plant?

Biology

2 answers:

Slav-nsk [51]3 years ago

8 0

Answer:

The correct answer will be option D (both b and c).

Explanation:

Xylem is a type of vascular tissue in plants which transport the water and minerals in plants.

The major force involved in the transport of water through xylem are :

1. Transpiration pull-The force generated by the plants due to loss of water through a process called transpiration in leaf area which aids in the suction of water and minerals from roots to other parts of the plants is known as transpiration pull.

Loss of water in leaves due to transpiration generates negative pressure potential which causes upward movement of water from soil to roots to leaves is the major driving force in transport of water.

2. Capillary action- The movement of a liquid across the surface of a solid due to adhesion between solid and water molecules is known as capillary action.

Plant transpiration causes upward movement of water through xylem to which water molecules adhere gets the water to the tips of the tallest trees.

Thus, option D- transpiration pull and capillary action is the correct answer.

Sophie [7]3 years ago

5 0

It is d: both b and c the capillary action and transpirational pull

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What is affected by the electrical signal sent by the fourth structure of the reflex arc?(This will be the fifth structure in th

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Answer:

The effector organ is affected by the fourth structure of the reflex arc.

Explanation:

When talking about the reflex arc, we refer to the sequence of events that occur for the body to react to an external stimulus.

In general terms, the peripheric nervous system receives information from a stimulus coming from the external environment. This information is sent to the central nervous system, where it is processed. From the CNS, another signal is sent as a response to the stimulus. This mechanism is known as the reflex arc.

Five elements compose the reflex arc, which are receptors, three types of neurons, and effectors.

There are three types of neurons involved in the mechanism:

• Afferent or sensorial neurons

• Interneurons

• Efferent or motor neurons

Action:

Ascending branch

The stimulus reaches the body and is received by the specialized sensory receptors. Information is received by these receptors and converted from stimuli energy (temperature, pressure, light, etc.) to action potential energy. Afferent neurons, placed in the dermis and epidermis, receive information from receptors, react and send the information to the central nervous system as nerve impulses.

Descending branch

Once the information reaches the central nervous system, it is processed by the interneurons that analyze it before sending a response. Interneurons manage many sensorial signals, evaluate and compare them, and send a motor response.

Efferent neurons receive information from the interneurons and are stimulated to carry these new signals from the central nervous system to the cells of the effector organs. The effector organ can be a muscle or a gland.

Finally, the target tissue responds to the stimulus as a contraction, if it is a muscle, or as hormones release if it is a gland.

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3 years ago

Which of the following tissues, cells, or structures in flowering plants is a part of the sporophyte generation and therefore di

jeka94

Answer:

Cell of and integument

Explanation:

When flowering plants reproduce by sexual reproduction, they form seeds contained into fruits. The fruit is derived from the maturation of the flower's ovary (female part) after fertilization.

A mature seed contains three generations:

a diploid embryo (the new sporophyte),
The embryo is surrounded by haploid female gametophyte tissue that supplies nutrition
All the above structure is in turn surrounded by the seed coat (diploid parental sporophyte tissue). The seed coat is produced by integument cells to protect the embryo during its development and before its can germinate. As it is produce by it parental plant, its ploidy level diploid.

In contrast, the generative nucleus and sperm cell are part of male gametophyte (pollen grain) and therefore haploids. Synergid cell is part of embryo sac, therefore belongs to female gametophyte and thus being haploid. Finally, cell of endosperm is usually derived from the fusion between a sperm cell and one of the two female gametes present within the embryo sac, thus being triploid.

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