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

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

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Biology
In test tube baby

Fertilization of ova takes place in test tube which development of embryo occur in uterus
Fertilization takes place in uterus while development takes place in test tube
Fertilization of ova and development takes place in test tube
Development of ova take place in test tube without fertilization

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