Biology
The main function of the inner bark of a woody plant is to

Act as a membrane impermeable to water and gas
Protect the plant from herbivorous animals
Transport minerals and water from the roots to the leaves
Transport food from the leaves to the other parts of the plant

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Biology
Which one of the following statements regarding haemoglobin is correct?

Haemoglobin present in RBC can carry only oxygen but not carbon dioxide
Haemoglobin of RBC can carry both oxygen and carbon dioxide
Haemoglobin is only used for blood clotting and not for carrying gases
Haemoglobin of RBC can carry only carbon dioxide

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