Chemistry{♥}

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Biology 24 - Translocation

Translocation in plants:

This important process in carried out by the phloem.

--> The phloem transport simple sugar(sucrose) and amino acids (made in leaves) to all parts of the plant.

Biology 23

Factors that affects the rate of transpiration of plants:

The process whereby water vapour evaporates from the underside of the leaves is called transpiration.

Here are the factors affecting it:

1) Light - The brighter it is, the bigger the stoma will it become, hence, when light intensity increases, the rate of transpiration increases too.

2) Humidity - The lower the humidity, the faster the rate of transpiration.

3) Wind speed - The faster the wind speed, the higher the rate of transpiration.

4) Heat - The hotter the weather, the higher the rate of transpiration.

Biology 22

Here's a video summarising what a vascular bundle is (:

Enjoy.

Biology 21

Here's a video of transpiration in the plant.

Transpiration in plants:

Osmosis of water from the soil into the root hair cells.

Transpiration pull is the main force of absorbing water.

Osmosis into inner root hair cells. Then to the xylem vessels

Evaporation in the thin film of moisture in the spongy mesophyll cells.

Diffusion of the water vapour through the stomata on the underside of the leaves finally.

Biology 20

The blood clotting process in our body:

Thromboplastin is released by damaged tissues in our body.

Thereafter, it reacts with calcium and protein prothrombin.

Prothrombin is converted into thrombin which catalyses the conversion of protein fibrinogen.

Fibrinogen will be converted into fibrin threads, then it will solidify as the top layer of cells dies.

To form a scab. The scab protects the underlying skin where the new cells are being formed to replace the old ones.

When new cells are completed, the scab will drop off.