In vascular plant, Xylem is one of the two tissue involve in transport water from roots to stems and leaves and also transports nutrients.
Two types of cells of this tissue are tracheids and vessel elements which are involved in transport.
<h3>What is the function of xylem ?</h3>
Xylem and phloem are known are two major vascular tissue.
Xylem tissue involve in transport of water and some nutrients from the roots to the leaves.
Phloem tissue involve transport of sucrose and other nutrients throughout the plant.
The passive transport called xylem sap occur through a long tube xylem cells.
The phenomenon where the xylem sap allow the flow upwards against gravity is called capillary action.
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2) The concentration of O2 will increase inside the cell.
The cell will want to reach equilibrium, meaning that there should be an equal number of oxygen inside and outside the cell. In the picture, more oxygen is shown outside the cell than inside so oxygen will flow into the cell until it has reached equilibrium. Therefore, the concentration of O2 will increase in the cell.
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They open in response to pressure within the guard cells.
Answer;
Without the keystone species, the rocky inter-tidal ecosystem would be dramatically different or cease to exist altogether
Explanation;
Keystone species have low functional redundancy. This means that if the species were to disappear from the ecosystem, no other species would be able to fill its ecological niche.
For instance; the starfish Pisaster ochraceus is a keystone species in the rocky marine inter-tidal communities off the northwest coast of North America. It feeds on the mussel Mytilus californianus and is responsible for maintaining much of the local diversity of species within certain communities.
