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tatyana61 [14]
3 years ago
13

When a pollen grain reaches the stigma of a plant the plant has been?

Biology
1 answer:
PIT_PIT [208]3 years ago
8 0
The plant has been pollinated. Pollination is the process by which pollen reaches the carpel (female reproductive organ in a flower which consists of the stigma, the style and the ovary), of a flower, transferred from the anther to the stigma, or reaches the ovule directly (in confers and their relatives).
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Explain one adaptation that helps grasses succeed in grasslands
ehidna [41]

Answer:

Basal meristems

Explanation:

Meristems are the portion of plants able to generate any kind of new tissues. Therefore, the way plants keep their meristems protected is related to climate adaptation.

Grasslands tend to be arid ecosystems, so grasses have developed basal meristems, meaning they spend the dry season very close or under soil, where water evaporates slowlier than above surface, until wet season allows meristems to generate new stems and leaves.

This disposition is also useful in cases of fire and grazing, which are also frecuent in grasslands.

8 0
3 years ago
What step in the water cycle moves water from ponds and lakes into the air Afreezing B condensation cevaporation dmelting
densk [106]

Answer:

Water from ponds and lakes is moved into the air during evaporation. During the process of evaporation, water changes from a liquid (water) to a gas (water vapor).

Explanation:

that is the correct answer

4 0
3 years ago
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___ It’s a nice sunny day with no clouds but it is very cold outside
Vaselesa [24]

Answer:

..mmm.... high pressure I guess.....

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7 0
2 years ago
Indicate whether each of the following statements is true of depurination (DP), deamination (DA), or pyrimidine dimer formation
solniwko [45]

Answer:

- This process is caused by spontaneous hydrolysis of a glycosidic bond: depurination and deamination

- This process is induced by ultraviolet light:  pyrimidine dimer formation

- This can happen to guanine but not to cytosine: depurination

- This can happen to thymine but not to adenine:  pyrimidine dimer formation

- This can happen to thymine but not to cytosine: none

- Repair involves a DNA glycosylase: deamination

- Repair involves an endonuclease: depurination, deamination and  pyrimidine dimer formation

- Repair involves DNA ligase: depurination, deamination and  pyrimidine dimer formation

-  Repair depends on the existence of separate copies of the genetic information in the two strands of the double helix: depurination, deamination and  pyrimidine dimer formation

- Repair depends on cleavage of both strands of the double helix: none

Explanation:

Depurination is the loss of purine bases (either adenine or guanine), while deamination refers to the removal of an amino group. During depurination, a β-N-glycosidic bond is cleaved by hydrolysis and a nucleic base is released (either adenine or guanine). All DNA bases may undergo deamination, except thymine (since thymine does not have an amino group). The ultraviolet (UV) radiation can cause thymine or cytosine to form dimers (e.g., pyrimidine dimers), being thymine dimers the most common lesion when DNA is exposed to UV light. Pyrimidine dimers may be repaired by different excision mechanisms, e.g., nucleotide excision repair, where the recognition of the DNA damage leads to the removal of the DNA fragment containing the lesion. DNA glycosylases are enzymes involved in the mechanism of base excision, these enzymes recognize and remove damaged bases by hydrolysis of the glycosidic bond, producing an abasic (apurinic and apyrimidinic) site. A DNA ligase enzyme covalently joins two DNA molecules by forming a phosphodiester bond, which is required during these processes.

8 0
2 years ago
What is the difference between the chemical and physical layers of the earth?
r-ruslan [8.4K]
These layers<span> do not correspond on a one-to-one basis with the </span>compositional layers<span>. The Earth has five mechanic </span>layers<span>: The lithosphere is the outermost mechanical </span>layer<span> and is the most rigid </span>layer<span> of the Earth. The lithosphere consists of the crust, and some of the uppermost mantle.</span>
6 0
3 years ago
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