Question

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Answer 1

Answer:

1) Single circulationDouble circulation* Blood flows only once through the heart during one cycle of passage through the body.* Blood flows twice through the heart during one cycle of passage through the body.* Occurs only in fishes.* Occurs in all other vertebrates other than fishes.* Only venous blood passes through the heart* Mixed or oxygenated or venous blood passes through the heart.* Less efficient as gill capillaries slow down the blood flow, hence the body receives blood at a low pressure which decreases the rate of oxygen supply to the cells.* More efficient as blood flows at higher pressure especially in birds and mammals. This increases the rate of supply of food and oxygen to the cell and also rapid removal of wastes from them.

Answer 2

1.?
2. Arteries are thicker in size.
They transport blood from
heart to all parts of the body.
Veins are thinner in size and they take deoxygenated blood from the body to the heart.
3. Villi Are present in the small intestine they increase the surface area for absorption of more food.
4. Aerobic respiration is the process in which organisms convert sugar into biochemical energy using oxygen while in anaerobic respiration is the process in which organisms convert biochemical energy in the form of sugar in the absence of oxygen.
ii) Xylem transports water and minerals from roots to all the parts of the plant while phloem transports food to all the parts from leaves.
5. Because fish feed on algae.

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