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nataly862011 [7]
3 years ago
15

What structure forms during angiosperm fertilization but does not form during fertilization among other types of plants?

Biology
1 answer:
OLEGan [10]3 years ago
5 0
The answer is '<span>triploid cell'. 
</span>

This occurs when two sperm nuclei reach the interior of a female gametophyte, where one sperm will fertilise the egg cell to form a zygote, whereas the other usually fuses with the binucleate central cell, forming a primary endosperm cell, effectively constituting an organism separate from the growing embryo. Approximately 70% of angiosperm species have polyploid endosperm cells which are typically triploid (containing three sets of chromosomes), but can vary widely from diploid(2n) to 15n.

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3 years ago
Can anyone help with this problem!
galina1969 [7]

Answer:

Parts of the reproductive system. image attached

3 0
3 years ago
The effect of sympathetic nervous system stimulation on the heart is to: Group of answer choices increase the refractory period.
ExtremeBDS [4]

The effect of sympathetic nervous system stimulation on the heart is to increase heart rate and myocardial contractility.

In the sympathetic nervous system (SNS), as the sympathetic stimulation increases, the heart rate also decreases along with the force of contraction.

The heart rate increases because of the release of hormones catecholamines - epinephrine and norepinephrine whereas the force of contraction increases because of a higher end-systolic volume [ESV] which requires a forceful heart contraction to pump more blood out of the ventricle which will decrease the ESV value.

The end-systolic volume [ESV] is the amount of blood that remains in a ventricle after a contraction (systole) which is to be maintained at around 50 mL of blood.

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7 0
2 years ago
Which of the following animals generally has the lowest volume of urine production? a. vampire bat b. salmon in fresh water c. m
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The following animals generally has the lowest volume of urine production

c. Marine bony fish

All bony fish have segmented fin rays that are derived from their epidermis and sutures in their neurocranium. Both bony fish and cartilaginous fish have gills for breathing, but the gills of bony fish are protected by a hard, bony plate. Bony fish may also have prominent rays, or spines, in their fins; this characteristic is known as a "operculum".

Bony fish, in contrast to cartilaginous fish, have swim or gas bladders to control their buoyancy. On the other hand, cartilaginous fish require constant swimming to maintain buoyancy.

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3 0
1 year ago
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sergey [27]

Answer:

False

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