<span>The Cell theory states that..
1)all living things are composed of one or more cells 2)cells are the smallest units of structure & function of living things 3)New cells are produced by preexisting cells
The 2 Domains that include all organisms that are made of prokaryotic cells are-
bacteria and archaea. these organisms are multicellular and may form colonies
cytoplasm fluid part of the cell
plasma membrane : membrane surrounding the cell
ribosomes : solid,molecular organelles that make proteins
Circular DNA molecule in prokaryotes where genes are found
plasmids
cell wall
rigid structure around plasma membrane
Used for swimming (moving) through a liquid
flagellum
used to adhere to surfaces (like your teeth) fimbriae
as a cell increases in diameter, its volume increases more than its surface area. the surface area to volume ratio is reduced
since the surface is where the cell exchanges substances w/its environment, the reduction in this ratio decreases the rate of exchange. thus making cell work less efficient</span>
Pods of certain plants such as gorse and pansies have a way of flinging their seeds when ripe in every direction with considerable force. The thing that helps these seeds disperse is first and foremost the mechanical force itself used to catapult the seeds.
As they ripen, the seed pods gradually lose moisture, building up tension in their cells and subsequently in the pod as a whole. The structure inevitably fails gradually and during a hot day it gives way altogether due to heat stress and triggers an explosion firing the seeds with appreciable force away from the parent plant almost like a projectile for up to 100m (300 ft) away.
It is important to note that plants which use this explosive method or ballistic dispersal as it is also called tend to have seeds that are generally large and too heavy to be carried by the wind unlike those of plants such as dandelions which are light enough for wind dispersal. Therefore gorse and suchlike plants employ ballistic methods to ensure their seeds travel as far away from the parent plant as possible.
