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goblinko [34]
3 years ago
5

The polen grains in this plant causes asthama in man​

Biology
1 answer:
iragen [17]3 years ago
7 0

Answer:

I hope this helps :)

Explanation:

Tree pollen is a common hay fever trigger. It’s the first pollen to be released during hay fever season, and levels are typically highest from late March to mid-May.

Around 95% of people’s hay fever is triggered by grass pollen, which tends to be highest between mid-May and July. In fact, there’s strong evidence that when grass pollen levels are high, people with asthma are more likely to need hospital treatment.

Hay fever can also be triggered by weed pollen, which is highest from the end of June until September.

Know your pollen triggers

You can be allergic to more than one kind of pollen across the year. Different pollens are released at different times, but our changeable weather makes it hard to predict exactly when. If you have hay fever symptoms all year round you might have non-allergic rhinitis.  

If you regularly get hay fever and take antihistamines, start taking them up to four weeks before you normally get symptoms. Starting them early means that when pollen starts being released, the medication has already built up in your bloodstream so you may be less likely to react.

If you usually use a steroid nasal spray, it can take up to two weeks to start working, so again, start using it before your personal pollen trigger is released.

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Some materials can move across the cell membrane against a concentration gradient by
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Answer:

Molecules which move against the concentration gradient across the cell membrane employ the mechanism of active transportation.

Explanation:

Normally, permitted molecules moves across the cell membrane of the cell by the process of diffusion and osmosis. This is used when molecules move from hypertonic region to hypotonic region (if ions) and hypotonic to hypertonic (if water). This is a passive transportation which do not require the expense of energy from the cell.

In contrast, when molecules move in or out of the cell against their concentration gradient, that is ions moving from hypotonic region to hypertonic region, they implore the expense of energy in form of adenosine triphosphate (ATP), and the involvement of the membrane carrier proteins. This is called active transport.

7 0
3 years ago
Match the bacterial shape with its description
slega [8]

Answer:(A) a cylindrical shaped bacteria exhibiting a variety of rod shapes.- pleomorphic.

B) A bend, or 'coma shapped' rod - Vibrio.  

C) Long, curved, flexible rod - spirochete.

D) Long, curved rod - Spirillum.

E) A small, cylindrical shaped bacteria with a cocci appearance - coccobacillus.

F) Cylindrical shape - Rods.

G) Round shape - Coccus.

Explanation:

A). A pleomorphic bacteria is the one which is capable of changing it's shape, mode of nutrition and reproduction.

B). Vibrio is the genus of gram-negative bacteria. It posses a curved comma shape. This is responsible for foodborne infections.

C). Spirochete is a helical, rod shaped bacteria. It posses flexible cell wall and a mechanism that helps in motility.

D). Sprillium is a gram-negative bacteria. It has a rigid spiral structure. It has a long curved rod. It is found in the stagnant water and can also be responsible for causing water borne diseases.

E). Coccobacillus is a bacteria which has shape which is in between cocci and rod. These are very short rods which are mistakenly consider as cocci.

F). A bacillus or bacilliform bacteria is a rod shaped bacteria which can be found in different taxonomic groups of bacteria. These have cylindrical shape.

G) A coccus is the shape of the bacteria which can be consider as either spherical, ovoid or round in shape.

6 0
3 years ago
Depression in terms of ______ suggests that depressed mood protects the organism by reducing energy expenditure, thereby protect
STALIN [3.7K]

Answer:

Resource conservation

Explanation:

Depresion in term of Resource conservation theory is a mental state where an individual or organism develops motivation to conserve a depleting resources while in search of a new source.

For a depressed organism to reduce energy consumption in order to save for the future, it is exhibiting resource conservation

6 0
3 years ago
The following statements refer to a comparison of reproduction in ferns vs. flowering plants. Indicate whether each statement is
Dennis_Churaev [7]

Answer:

Both ferns and flowering plants produce spores at some point in their life cycles. True

Only ferns have a gametophyte as part of their life cycle. False.

Only flowering plants produce pollen grains. true

Both a tree and a large fern plant are diploid sporophytes. True

Explanation:

Yes, both ferns and flowering plants produce spores in their life cycles. In fern plant, it produce spores on the underside of the leaves whereas in flowering plant, there are two types of spores such as microspores and megaspores. Both ferns and flowering plants have gametophyte as part of their life cycle. Flowering plants produce pollen grains whereas non-flowering plants produce spores to continue their generation. Both tree and large fern plants having diploid sporophytes which is a necessary part of their life cycle.

7 0
2 years ago
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