Sunday, March 27, 2011
(I)GCSE Topic 2.80 Geotropism
'GEO'tropism refers o gravity and 'TROPISM' refers to growth response to gravity.
(I)GCSE Topic 2.79 Plants Respond to Stimuli
-Stimuli = changes in the environment e.g. temperature changes, light changes.
-Plants have receptors which can detect these stimulis. The response to this is often growth of the plants.
-Growth in response to Stimulis is called Tropism. Tropism involving light is called Phototropism. Tropism involving gravity is called Geotropism.
-Connection between Receptor and Response usually take the form of plants hormones.
-Plants have receptors which can detect these stimulis. The response to this is often growth of the plants.
-Growth in response to Stimulis is called Tropism. Tropism involving light is called Phototropism. Tropism involving gravity is called Geotropism.
-Connection between Receptor and Response usually take the form of plants hormones.
Thursday, March 24, 2011
(I)GCSE 2.53 Uptake of Water
-Branching pattern increases the surface area of which water can be taken in/the absorbtion of water.
-The hair on the surface of the ends of the roots of the plants are called the root hair cells. And the microscopic examination reveals that these are the Epidermal cells.
-The extension of the cell wall of the epidermal cells is what is known as 'Root Hair Cells' which have more surface area for the absorbtion of water.
-The machanism by which plants absorb water involve the active transport of minerals. This then encourages the plants to take up more water by Osmosis.
-OSMOSIS - water moves from the dilute region (soil water surrounding the root hairs) to the concentrated region (build up of minerals inside the extended cell wall of the root hair cells).
-Water then moves across the cortex to the xylem by Osmosis.
-The concentration of minerals in the root hair brings about the osmosis of water.
-The hair on the surface of the ends of the roots of the plants are called the root hair cells. And the microscopic examination reveals that these are the Epidermal cells.
-The extension of the cell wall of the epidermal cells is what is known as 'Root Hair Cells' which have more surface area for the absorbtion of water.
-The machanism by which plants absorb water involve the active transport of minerals. This then encourages the plants to take up more water by Osmosis.
-OSMOSIS - water moves from the dilute region (soil water surrounding the root hairs) to the concentrated region (build up of minerals inside the extended cell wall of the root hair cells).
-Water then moves across the cortex to the xylem by Osmosis.
-The concentration of minerals in the root hair brings about the osmosis of water.
(I)GCSE Topic 2.54 Transpiration
-Transpiration is the evaporation of water from the surface of a plant.
-Water is heated in the leaf from the sunlight and is turned into gas. Evaporation then occurs through the stomatal pores.
-Sunlight enters the leaf through the chloroplast cells but not all of the light is absorbed by the chloroplast cells.
-Water that is carried from the xylem moves through the spongy mesophyll, and the area above the stomatal pore is where the liquid turns into gas.
-Water vapor gas diffuses through the pore of the leaves down a steep diffesion gradient.
-Water is heated in the leaf from the sunlight and is turned into gas. Evaporation then occurs through the stomatal pores.
-Sunlight enters the leaf through the chloroplast cells but not all of the light is absorbed by the chloroplast cells.
-Water that is carried from the xylem moves through the spongy mesophyll, and the area above the stomatal pore is where the liquid turns into gas.
-Water vapor gas diffuses through the pore of the leaves down a steep diffesion gradient.
Sunday, March 13, 2011
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