Q1. [5] medium initial-understanding
Read the following case and answer the questions that follow.
A biologist studies two plants: Plant A is a tall tree and Plant B is a single-celled green alga living in a pond. Both are autotrophs and carry out photosynthesis.
(i) How does Plant B (the single-celled alga) obtain its CO₂ and water for photosynthesis without any specialised transport system?
(ii) For Plant A (the tall tree), name the two specialised tissues used for transport and state what each carries.
(iii) What force primarily drives water upward in the xylem of Plant A during the day when stomata are open?
(iv) Both plants produce oxygen as a by-product of photosynthesis. According to the chapter, how can oxygen be considered an 'excretory product'?