Each point: 1 Mark
Phloem is one of the two types of vascular tissue in plants. It transports food formed in the leaves to the other parts of the plants.
Each description: 1 Mark
Blood pressure is the pressure exerted by blood on the walls of the arteries.
The throbbing movement is called pulse and it is due to the blood flowing in the arteries.
The number of beats per minute is called the pulse rate. A resting person usually has a pulse rate between 72 and 80 beats per minute.
Location: 1 Mark
Structure: 1 Mark
Function: 1 Mark
Kidneys are the bean-shaped organs that are located in the upper abdominal area. They sit opposite each other on both the left and right side of the body; the right kidney, however, sits a little lower than the left to accommodate the size of the liver.
They filter wastes, including urea, salts, and excess water, which are flushed out of the body as urine.
Location: 1 Mark
Process: 2 Marks
Plants absorb water and mineral nutrients from the soil through the roots and transport it to the leaves. The leaves prepare food for the plants, using water and carbon dioxide in the presence of sunlight and chlorophyll. This process is called photosynthesis. The prepared food is in the form of glucose.
Excretion: 1 Mark
Components: 2 Marks
Functions: 2 Marks
During various activities which are performed within the cells in the body, certain by-products are produced. Some of these products are toxic and are required to be thrown out. This is the reason why excretion is required.
The various components of the excretory system of humans include a pair of kidney, ureter, urinary bladder and the urethra.
Kidneys are the structures where the purification of blood occurs. From the kidneys, the urine goes into the urinary bladder through tube-like structures called ureters. It is stored in the urinary bladder and is passed out through the urinary opening at the end of a muscular tube called urethra.
