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ad-work [718]
3 years ago
10

A thin, flexible, semipermeable barrier around the cell which regulates what enters and leaves the cell.

Biology
2 answers:
raketka [301]3 years ago
5 0

That would be Cell membrane. :-)


Citrus2011 [14]3 years ago
3 0

Answer:

A thin, flexible, semipermeable barrier around the cell which regulates what enters and leaves the cell is cell membrane. The plasma membrane is another name of the cell membrane.

The plasma membrane is semipermeable because it allow only some molecules to enter and exit the cell. Small polar molecules can easily cross the plasma membrane along the concentration gradient diffusion.

For the passage of large, non-polar and charge molecules plasma membrane have carrier proteins which can be used to transport the molecules along the concentration gradient by facilitated diffusion or against the concentration gradient by active transport. Therefore, the correct answer is the cell membrane.  

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What conditions are required for a hurricane to form
andrezito [222]

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- The warm water must be at least 200 feet deep

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7 0
3 years ago
When is the best time to harvest crops?why?​
Nady [450]

\huge \bold \blue{★Question★}

When is the best time to harvest crops? why?

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Correct timing of harvest is crucial to crop loss prevention. Grain losses may occur caused by rats, birds, lodging, insects, and shattering. Timely harvesting ensures good grain quality and high market value.

Harvesting too early will result in a higher percentage of unfilled or immature grains, which will lower the yield and cause higher grain breakage during milling. Harvesting too late will lead to excessive losses and increased breakage in rice. Harvest time also affects the germination potential of rice seed.

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There are different ways to determine the correct harvest time:

Moisture content

Grain moisture content ideally is between 20−25% (wet basis). Grains should be firm but not brittle when squeezed between the teeth.

Ripe grains per panicle

The crop should be cut when 80−85% of the grains are straw (i.e., yellow-colored).

Number of days after sowing

Generally, the ideal harvest time lies between 130 and 136 days after sowing for late, 113 and 125 for medium, and 110 days for early-maturing varieties.

Number of days after heading

For dry season harvesting, an optimum time is 28 to 35 days after heading. In wet season harvest, optimum time is 32 to 38 days after heading.

Other considerations

Harvesting also needs to be timed so that threshing can be done as soon as possible after cutting to avoid rewetting and to reduce grain breakage.

If the crop has a lot of surface moisture, (e.g. from previous rainfall or early in the morning), it is advisable to wait until the surface moisture dries off.

8 0
3 years ago
Read 2 more answers
The cells of a mature pea plant have 10 chromosomes. How many chromosomes does a nucleus in the pea endosperm contain
Irina-Kira [14]

Answer:

15 chromosomes

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The endosperm is formed through double fertilization where one male gamete nucleus with polar nuclei to form a triploid nucleus called the primary endosperm. The endosperm therefore will contain 15 chromosomes since the polar nuclei is diploid and the male gamete is haploid forming a triploid nucleus.

4 0
3 years ago
AB
Gre4nikov [31]

Answer:

cos it works on humans better i guess

Explanation:

5 0
3 years ago
A Ferris wheel has a mechanical advantage of ___________________________ one and the trade off is that it covers a greater dista
Anna35 [415]

Answer:

A. less than one

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3 0
3 years ago
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