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3 years ago

What method(s) do plants use to obtain nitrogen? Select all that apply.

Biology

1 answer:

elena-14-01-66 [18.8K]3 years ago

4 0

Answer:

Plants can't use N2 as is so the first option is wrong. They do have relationships with bacteria that live in nodules of the root and convert the nitrogen into ammonia, a usable form for the plants. So the second option is correct. There are bacteria living in the soil as well that convert nitrogen to ammonia so technically option 3 is also correct. Again, nitrogen if present in water would be in the form N2 which is not usable by plants so 4 is wrong.

These are correct:

use bacteria to convert nitrogen to usable form

In obtain usable nitrogen compounds from the soil

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How can atmospheric nitrogen be converted to ammonium ions or nitrate ions?

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Answer: When a plant or animal dies, or an animal voids waste products, the initial form of nitrogen is organic. Bacteria and fungi in the soil produce enzymes that convert the organic nitrogen back into inorganic ammonium ions (NH4 +). Ammonium is converted to nitrite ions (NO2 -) by soil bacteria like Nitrosomonas

Explanation: Hope it helps

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3 years ago

The wild-type color of horned beetles is black, although other colors are known. A black horned beetle from a pure-breeding stra

Kisachek [45]

One hypothesis that explains the result is : A) Two genes are involved with 12:3:1 epistasis, such that A_B_ and A_bb are black, aaB_ is brown,and aabb is green.

Explanation:

This is a case of Dominant Epistasis.
When two genes are involved and presence of dominant allele of one gene masks the effect of either allele of the second gene then the epistasis is termed as dominant epistasis.
In the given case black :brown: green ratio is approximately equal to 12:3:1.
Here presence of a dominant A allele that is responsible for the black colour masks the effect of either allele of B. Therefore A_B_ and A_bb produces black beetles
Again , absence of dominant A allows B to express itself and Brown beetles are produced thus aaB_ is brown.
When both the genes are present as recessive alleles, neither brown nor black colour is expressed and the beetles are green.Thus, aabb are green.

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3 years ago

____ happens when a lineage splits into two or more lines of descent.

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Hence, the blank can be filled with 'speciation'.

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Answer:

Order the steps to take when drawing electron dot diagrams.

Count the dots to make sure that all of the valence electrons are represented.

✔ 4

Draw dots around the chemical symbol to represent the valence electrons of the atom.

✔ 3

Use the periodic table to find the chemical symbol of the atom and the number of electrons in the valence shell.

✔ 1

Write the chemical symbol of the atom.

✔ 2

Explanation:

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