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3 years ago

What are the 1st and 2nd line of defence of plant against pathogens?

Biology

1 answer:

sladkih [1.3K]3 years ago

6 0

Answer: These may be:

physical defenses (1st line)
chemical defenses (2nd line)

Explanation:

Plants employ several methods in order to defend themselves from pathogens. These may be physical defenses or chemical ones. Several have adaptations to their surfaces that prevent the entry of pathogens, called physical barriers such as

thick waxy cuticles
thorns, which are modified plant branches
spines, which are modified plant leaves
gall production at infected sites to prevent pathogenic spread

Chemical defenses include the production or secretion of:

defensins
antimicrobials such as tannins or resins
gum at areas facing pathogenic attacks

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The reactants of cellular respiration are

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2 years ago

A geneticist isolates a new restriction enzyme from the bacterium Aeromonas ranidae. No other restriction enzymes have been isol

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3 years ago

Why does the cell replicate its DNA?

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Explanation:

When cells asexually reproduce they split off from itself, and they have to replicate their DNA so both cells will have it because DNA is what tells the cell what to do, and how to work. The DNA will tell the cell parts all how to do their jobs, and will let the cell know when it should split off from itself. The DNA controls everything in the cell so without it the cell wouldn't know what to do.

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3 years ago

Read 2 more answers

Recall that the ability to maintain a stable internal environment in spite of changes in the external or internal environment is

muminat

Answer:

Homeostasis

Explanation:

Homeostasis is a mechanism of the body which involves negative feedback loops that helps the body to maintain a stable internal environment when there is an external or internal change.

An example of homeostasis in the human body is the regulation of the internal temperature of the body. When there is a change in the normal body temperature, for example, if your temperature drops sharply below 37 degrees Celsius, homeostasis kicks off in the body to maintain the normal body temperature. Homeostasis uses thermoregulation mechanism which triggers shivering to raise the body temperature in an attempt to return it back to normal.

Homeostasis also makes it possible for the body to maintain the balance of water and other substances in the body like calcium in our body. For example, when the calcium level drops below normal level, the parathyroid gland secretes hormone which helps in the increasing of blood calcium levels.

Homeostasis s a essential mechanism that helps keeps the body in a balance and functional state.

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3 years ago