All categories

3 years ago

What is one major impact of seedless vascular plants?

Biology

2 answers:

nekit [7.7K]3 years ago

7 0

The vascular seedless plants are utilized as the medicinal plant and fertilizer.

Further Explanation:

The vascular plants are those plants that possess xylem and phloem for the transport of water and food respectively. Plants that have vascular system but are seedless are the members of Pteridophytes.

The characteristics of Pteridophytes:

1. They are seedless and vascular cryptogams: They reproduces through the production of spores.

2. They show alternation of generation as the sporophytic generation alternates with the gametophytic generation: Sporophyte possess true root, stem and leaves.

3. Spores are developed in the sporangia. Both type of spores are developed- homosporous and heterosporous.

4. Sex organs are multicellular and are jacketed.

Some of the example of Pteridophytes are:

1. Equisetum

2. Salvinia

3. Dicksonia

4. Selaginella

The importance of pteridophytes:

1. They are used as cattle feed

2. They are used for medicinal purpose. For example the foliage decoction of Lycopodium is utilized in homeopathy to treat certain disease such as constipation, eczema, diarrhea and inflammation of liver. Equisetumcontains various flavonoid and saponina that have diuretic effect.

3. Marsilea contains starch and are consumed by people as food in some areas.

4. Aquatic pteridophyte such as Azollaare used as a very good biofertiliser.

Learn more:

1. Learn more about plant brainly.com/question/862697

2. Learn more about photosynthesis brainly.com/question/873199

3. Learn more about food brainly.com/question/1251757

Answer Details:

Grade: College Biology

Subject: Biology

Chapter: The Plant Kingdom

Keywords:

Vascular seedless, xylem, phloem, pteridophytes, sporophytic generation, gametophytic generation, Lycopodium, Marsilea, Azolla.

3241004551 [841]3 years ago

3 0

By far the greatest impact of seedless vascular plants on human life, however, comes from their extinct progenitors. The tall club mosses, horsetails, and tree-like ferns that flourished in the swampy forests of the Carboniferous period gave rise to large deposits of coal throughout the world.

You might be interested in

Concepts: What key concepts or ideas do you think are important and worth holding on to from the text?

Bingel [31]

Answer:

Osmosis is a process in which molecules pass from semipermeable membrane.

Explanation:

Osmosis is a biological process. The solvent molecules pass through semipermeable membrane and then solute particles move through the membrane with the help of water. These molecules are not capable of passing through the membrane in absence of water.

5 0

3 years ago

The amount of time spend in the bathtub and the temperature of the bath water

lesya692 [45]

Hihi!

In general the water should be kept around 100-105 degrees fahrenheit! You should only spend around 10 minutes in the bath at a time, long bathes and showers damage your skin and take out all the moisture in your skin as well!

I hope I helped!
-Loliarual

5 0

3 years ago

Innate immunity________.

labwork [276]

Answer:

The answer is A.

Explanation:

Since only 1 of the options is wrong, i assume you are looking for that one.

Two types of immunity systems, innate immunity and adaptive immunity. Adaptive immunity is formed when it is exposed to a harmful substance, vaccines for example create adaptive immunity.

Innate immunity is present at birth which consists our skin protects us physically, chemical substances in our blood that protect us from bacteria and infections and also our blood cells such as T cells.

Since innate immunity forms one of the first lines of defense in our immune system and is the first to respond to a threat in a few hours down to as little as minutes, it is not slower than adaptive immunity in its response to infections and pathogens.

I hope this answer helps.

4 0

3 years ago

A breeder is trying to decrease the maturation time in a population of sunflowers. In this population, the mean time to flowerin

aalyn [17]

Answer:

The next generation average time to flowering will be 98 days.

Explanation:

Before answering the question, we need to know a few concepts.

Artificial selection is the selecting practice of a specific group of organisms in a population -that carry the traits of interest- to be the parents of the following generations.

Parental individuals carrying phenotypic values of interest are selected from the whole population. These parents interbreed, and a new generation is produced.

The selection differential, SD, is the difference between the mean value of the trait in the population (X₀) and the mean value of the parents, (Xs). So,

SD = Xs - X₀

Heritability in the narrow-sense, h², is the genetic component measure to which additive genetic variance contributes. The heritability might be used to determine how the population will respond to the selection done, R.

h² = R/SD

The response to selection (R) refers to the metric value gained or lost from the cross between the selected parents. R can be calculated by multiplying the heritability h², with the selection differential, SD.

R = h²SD

R also equals the difference between the new generation phenotypic value (X₁) and the original population phenotypic value (X₀),

R = X₀ - X₁

-------------------------------------------------------------------------------------------------------------

Now that we know these concepts and how to calculate them, we can solve the proposed problem.

Available data:

trying to decrease the maturation time in a population of sunflowers.

the population mean time to flower is 100 days → X₀

Chosen parental Plants mean flowering time is 90 days → Xs
the narrow-sense heritability for flowering time is 0.2 → h²

According to what we sow previously, we need to find out the value of X₁, which reflects the next generation average time to flowering.

We know that R = X₁ - X₀, so we need to clear this formula to calculate X₁

X₁ = R + X₀

We already know that X₀ = 100 days,

Now we need to calculate R.

R = h²SD

We know that h² = 0.2,

Now we need to calculate SD

SD = Xs - X₀

Xs = 90 days → Parentals media flowering time

X₀ = 100 → Population media flowering time

SD = Xs - X₀

SD = 90 - 100

SD = - 10 days

Knowing this, we can calculate R

R = h²SD

o h² = 0.2

o SD = - 10

R = 0.2 x (-10)

R = - 2

Finally, once we know the R-value we can calculate the X₁ value

X₁ = R + X₀

X₁ = - 2 + 100

X₁ = 98

6 0

2 years ago

That is the opbposite of synthesois reaction

yaroslaw [1]

The two basic reaction types are synthesis and decomposition. ... Decomposition reactions are the opposite of synthesis reactions because they take apart larger molecules and/or compounds. The generic equation for a synthesis reaction is A + B à AB, where A and B are the pieces that make up the compound/molecule AB.

8 0

3 years ago