<span>Aside from absorbing water and nutrients in the
ground, roots are also the very support of a tree. It supports bigger trees to
stand and stay steady against heavy rains and strong winds. Roots are also
capable of absorbing water that may cause flood in the area, and support slopes
that may result to landslides. Roots are very important because it lessen the
chances of soil erosion in a certain place. Roots can also be used for plant
vegetations.</span>
A) <u>Mutation</u> is the original source of variations for plants and other organisms which develops differences among their respective species
Explanation:
Genetic variation leads to the natural differences between each individual and among individuals of a species. The main cause for this variation is due to alleles that cause variations in the composition of genes or the DNA sequences.
A mutation is a genetic variation which leads to the creation of a new allele in a species population. Each variation in the DNA sequence leads to an allele formation and each allele leads to a difference in character or trait between individuals since they are the alternate version of the original genes.
Although genetic variations could be brought about by crossing over, random fertilization, or independent assortment; mutation is the original source because it provides the basic raw material for all the evolutionary changes.
<em>Chlamydomonas</em><em> </em><em>is</em><em> </em><em>a</em><em> </em><em>unicellular</em><em> </em><em>algae</em><em>.</em><em> </em><em>It</em><em> </em><em>occurs</em><em> </em><em>in</em><em> </em><em>many</em><em> </em><em>Varie</em><em>ties</em><em> </em><em>.</em><em>Most</em><em> </em><em>of</em><em> </em><em>these</em><em> </em><em>are</em><em> </em><em>free</em><em> </em><em>floating</em><em>,</em><em>fresh</em><em> </em><em>water</em><em> </em><em>green</em><em> </em><em>algae</em><em>.</em>
<h2><em>More</em><em> </em><em>information</em></h2>
- <em>the plant body is un</em><em>i</em><em>cellular </em><em>and</em><em> </em><em>biflagellate</em><em>.</em><em> </em>
- <em>the cell is </em><em>spheric</em><em>a</em><em>l</em><em> </em><em>or cylindrical in shape</em><em> </em><em>.</em>
- <em>the Protoplasm of the cell is always surrounded by a thin </em><em>cellulose</em><em> wall</em><em> </em><em>.</em>
- <em>a pair of </em><em>flagella</em><em> </em><em>of</em><em> </em><em>equal</em><em> </em><em>size</em><em> </em><em> </em><em>is present at the anterior </em><em>end</em><em>.</em><em> </em><em>it moves by the lashing actions of the </em><em>flagella</em><em>.</em><em> </em>
- <em>usually two contractile vacuoles are present</em><em> </em><em>.</em>
- <em>it contains a single nuclear suspended in colourless portion of the cytoplasm </em><em>.</em>
Autographs are plants so they get their energy from the sun. Answer is B. Sun
Answer:
The correct answer is ''METAPHASE I.''
Explanation:
Metaphase I is the stage in which chromosomal studies are generally performed, because its morphology is very clear. The chromosomes, moved by the mitotic spindle, are placed in the center, between the two asters and form the so-called metaphase plate, in which the chromosomes are positioned in such a way that the kinetochore of each sister chromatid are oriented towards the opposite poles. Keeping chromosomes on the cell equator implies a balance between the forces of the microtubules that tend to move the kinetochores toward opposite poles, so positioning them in the center involves a great deal of energy.In each kinetochore, between 20-30 microtubules can be anchored, which exert traction force towards the pole from which they come, so the metaphase plate is maintained by the balance between the opposite forces of the poles on the chromosomes, which hold their sister chromatids by centromeric cohesin.