Question

respiration
4. a) What do you mean by double circulation of blood ?Why is it necessary
b) Name any two excretory products other than Ozand CO2 in plants.
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Answer 1

Answer:

systemic circulation

Explanation:

human beings, the blood goes through the heart twice during each cycle, i.e. the blood passes through the human heart two times to supply once to the whole body. So, it is called Double Circulation of blood.

Types of double circulation

The double circulation of blood includes:

(i) Systematic Circulation

(ii) Pulmonary Circulation

Systematic Circulation

Systemic circulation transfers oxygenated blood from the left ventricles to capillaries in the tissue.

The oxygen-rich blood is passed to the aorta for distribution into various body sections.

The veins and venules later absorb the deoxygenated blood, rich in carbon dioxide from different parts of the body.

Answer 2

Answer:

1.The blood flows twice through the heart during one cycle this is called double circulation of blood

It is necessary for highly efficient supply of blood

(especially in mammals and birds and they use more energy to maintain their body temperature)

2. Oxygen can be considered as a waste product for plants

Resins and gums

waste is stored in Vacoules of dead cells

they also release waste products into soil

Hope this helps (The answer for second question might not be correct, please refer other's answer for second one)

Thank you