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erik [133]
3 years ago
10

What is the role of pollen grains in fertilization process?

Biology
1 answer:
leva [86]3 years ago
6 0
As the pollen tube penetrates the ovule, it releases two sperm cells. ... As in gymnosperms, the ovule becomes a seed, encasing the embryo and endosperm in a seed coat. But unlike gymnosperms, in angiosperms the ovary containing the ovules develops into a fruit after fertilization
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Sign and symptoms of a disease depend on point of entry of a pathogen. Justify organ specific and tissue specific manifestation
Leokris [45]

Hi

It is true that the point of entry of a pathogen inside a body hold importance for the spread of pathogen. However, <em>organ and tissue specific manifestation is the real impact of a pathogen in any organism's body. Firstly we need to understand what is meant by Organ and tissue specific manifestation:</em>

It means that the specific organ or specific tissue is when affected by the entry of microbes or pathogens in the body, For example: The bacteria that cause tuberculosis enters the body through nose but manifests its action in lungs when multiplies there and affects the lungs' functionality and ultimately, depict the symptoms such as shortness and difficulty of breathing, this is basically organ specific manifestation.

Moreover, thee are some microbes that enter the body and damage certain tissues, for example HIV virus enters the body through sexual organs and travels to different tissues like nerve tissues, lymphatic system and damage them in a way that body's own immune system when counter reacts the microbes, it causes inflammation in the body and damage to overall tissues, This is called Tissue specific manifestation.

Hope it helps!

3 0
3 years ago
Which process works by applying pressurized water against a semi-permeable membrane that traps salts and other minerals?
Natali5045456 [20]

Answer:

Reverse Osmosis.

Explanation:

This is the mechanisms of water purification for drinking water which is droven by the chenical potential of the solvent .

It involves the use of partiaiy permeable membrane to allow ions , water molecules ,solvent molecules to pass through during purification

A pertial permiable menenrane in this prurifiction process is the membrane that allow only water molecules, ions and restricted other unwanted chemical contaminants from passing through it.

5 0
3 years ago
Which is a advantage of sexual reproduction over asexual reproduction
madam [21]
There is variation in DNA.
7 0
3 years ago
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How to make coins dirty
telo118 [61]
The dark brown color of a penny is most likely oxidation, which occurs when the copper in the penny comes in contact with oxygen.<span> </span>
4 0
2 years ago
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Why do cells need to carry out
AlladinOne [14]

Answer:

B

Explanation

They have to realease things somehow

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2 years ago
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