Waec Model Questions Vol1 2025 Biology Question 21
Practice objective / multiple choice question 21 from the 2025 Waec Model Questions Vol1 Biology examination.
A desert shrub has three leaf adaptations: (i) small leaf area of 20 cm², (ii) a thick cuticle that reduces transpiration by 40%, and (iii) sunken stomata that reduce transpiration by 30%. A typical leaf transpires at 5 mg H₂O per hour per cm². The shrub opens its stomata only at night, limiting effective transpiration to 6 h per day, whereas a typical plant without these adaptations has a leaf area of 50 cm² and transpires for 12 h per day. Calculate the total water loss (in grams) per day for the shrub and for the typical plant, and state how much more water the typical plant loses than the shrub.
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This is Waec Model Questions Vol1 2025 Biology Question 21. It is one of the objective questions from the 2025 Waec Model Questions Vol1 Biology examination.
Difficulty level: Hard .
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