40 points - 3 questionsspirogyra cells have a distinct cell structure, including the four cell parts labeled in the diagram in the introduction. (a) choose two of the labeled cell parts in the spirogyra cell diagram and describe the function of each part. (b) identify two cell parts that are not labeled in the diagram but would be found in a spirogyra cell. (c) describe the function of each cell part you identified in part (b).

Answer A:
 1. Spiral chloroplast:
                                     This organelle help in photosynthesis, because it contain green pigment called chlorophyll in which water and carbon dioxide combine in the presences of sun light to prepare glucose.
2. Cell wall:
                   It is chemically composed of an outer layer of pectin and an inner layer of cellulose. It provide rigidity and shape to spirogyra cell.

Answer B:
                The other parts which are not labelled include mucilage, cytoplasm, pyrenoids, cytoplasmic strand.

Answer C:
               
Function of pyrenoid:
                                 Each chloroplast strand has several round bodies called 'pyrenoids', which are responsible for starch production.
Function of mucilage:
                                    Mucilage help in retaining water in cell.
                                  

A)  is deeply buried and slowly cooled under high pressure

Explanation:

Diamond Formation in Earth's Mantle. Geologists believe that the diamonds in all of Earth's commercial diamond deposits were formed in the mantle and delivered to the surface by deep-source volcanic eruptions. The formation of natural diamonds requires very high temperatures and pressures.

Diamonds from Deep-Source Eruptions: Most commercial diamond deposits are thought to have formed when a deep-source volcanic eruption delivered diamonds to the surface. In these eruptions, magma travels rapidly from deep within the mantle, often passing through a diamond stability zone on its route to the surface.

Diamond-bearing kimberlite pipes are only found in ancient areas of the continents. But diamonds have also been found far from the pipes. This is because volcanic rock erodes and is washed away over time. Rivers, streams and glaciers can carry diamonds far from the original volcanoes.