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Sloan [31]
2 years ago
6

Within a gymnosperm megasporangium, which of the following developmental sequences is correct, assuming fertilization occurs? Gr

oup of answer choices sporophyte embryo, megaspore, female gametophyte, egg cell sporophyte embryo, megaspore, egg cell, female gametophyte megaspore, sporophyte embryo, female gametophyte, egg cell megaspore, female gametophyte, egg cell, sporophyte embryo
Biology
1 answer:
yan [13]2 years ago
3 0

Within a gymnosperm megasporangium, the following developmental sequences that are correct, assuming fertilization occurs is: megaspore, female gametophyte, egg cell, sporophyte embryo. The last Option (Option D) is correct.

In gymnosperm megasporangium, the meiotic division produces four haploid megaspores from a single cell, three of which generally degenerate. The female gametophyte is formed by mitosis from the surviving megaspore.

Prior to fertilization, the male mature gametophyte needs to be transferred to the female gametophyte for fertilization to take place.

When the nuclei of the sperm encounter the nucleus of the egg cell in gymnosperms, it fuses with the egg nucleus to produce a diploid zygote.

Mitosis occurs in the fertilized egg to initiate the growth of a new sporophyte generation (the multicellular embryo of the seed.)

Therefore, we can conclude that we've understood the mechanism of developmental sequence in the gymnosperm megasporangium.

Learn more about the gymnosperm here:

brainly.com/question/4526473?referrer=searchResults

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Trees use narrow tubes to transport water upward. Which property of water allows the water to rise in these narrow tubes?
cluponka [151]

Answer:

C. Cohesion of molecules

Explanation:

Cohesion is the interaction of molecules of the same substance together. By the force of cohesion if two drops of water come together they form one. Water has high rates of cohesion due to hydrogen bonds.  

This phenomenon also called surface tension and is what allows small insects to stand on water.

Cohesion along with adhesion of water to the walls of the narrow tube generate what is called capillarity. This allows liquids to ascend inside the narrow tubes. As long as the cohesion is less than the adhesion, the liquid will rise until both forces are equal.

8 0
3 years ago
List two species that may be threatened by the construction of a solar power tower
DENIUS [597]

Answer: the question is incomplete,below is the complete question.

List two species that may be threatened by the construction of a solar power tower in the California Desert

The answers are, Desert torties, mountain yellow legged frog and Joshua tree.

Construction of a solar power tower in the California Desert will threaten the existence of Desert torties, mountain yellow legged frog and and Joshua tree.

Explanation: The construction of solar power towers in Mojave desert in California poses a threat to the existence of quite a number of plants.The Mojave desert houses the largest solar power plant in the world,creating the solar power tower will create job opportunities for people but at the same time endangering the existence of about 12 rare plants that are found in the region of which Desert torties, mountain yellow legged frog and Joshua tree are greatly included,these plants cannot co-exist with solar thermal mirror arrays,this brings a controversy between energy/electricity generation and wildlife/ecosystem conservation.

3 0
3 years ago
At the equator, there are no
NISA [10]

The reason why at the equator, there are no summers or winters, only wet and dry seasons is : Because at the equator the daytime, night time, temperature and sunlight are moderate.

<h3>Meaning of equator</h3>

An equator can be defined as an imaginary line that runs from west to east thereby dividing the earth into two equal part.

The equator divides the earth into the northern and southern hemispheres. because the equator is at the middle every thing that is experienced there is moderate, unlike the those at the polar region.

In conclusion, The reason why at the equator, there are no summers or winters, only wet and dry seasons is Because at the equator is at the middle and therefore the daytime, night time, temperature and sunlight are moderate.

Learn more about the equator: brainly.com/question/1264608

#SPJ1

4 0
2 years ago
What is the best source of nuclear DNA when working with hair samples?
tino4ka555 [31]
The answer is a hair root.

Nuclear DNA is commonly extracted from the hair root. The hair root consists of keratinocytes. Keratinocytes are cells found in the epidermis. As all other cells, they contain DNA material. When keratynocites die, they get converted into keratoid material in the process of cornification. As a consequence, d<span>ead cells do not contain DNA material. Therefore, the hair root is the best source of nuclear DNA than shed or cut hair when working with hair sample.</span>
4 0
3 years ago
Read 2 more answers
What cell type has no membrane-bound organelles, has a single unbound chromosome, and is very small?
insens350 [35]

Answer:

Globules.

hope this helps :)

Explanation:

6 0
3 years ago
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