Answer:
Double fertilization gives stimulus to the plant that results in the development of the ovary into fruit and ovules into the seed.
Explanation:
The right answer is Mitochondria.
In the 20th century, scientists thought that plastids and mitochondria could come from procaryotes (bacteria). These would have been ingested by cells and live within them (in symbiosis). This endosymbiotic theory became perfectly plausible when it was discovered (in the 1950s and 1960s) that these organelles contained theori own DNA, tRNA and rRNA.
Protective outer coat since Virus is not considered cell
The correct option is C.
Scanning electron microscope is a type of microscope that uses beams of electrons that are reflected to form images to scan the surfaces of mounted biological specimens. High resolution, three dimensional images can be obtained via the reflected beam of electrons. Thus, the electron scanning microscope is the perfect microscope for examining the contours on the surface of a bacterial cell.