The diagram shows what happened in an experiment with plant seedlings.
Which characteristic of living things made the seedlings grow towards the light?
A) excretion
B) nutrition
C) respiration
D) sensitivity
▶️ Answer/Explanation
Ans: D
The seedlings grow towards the light due to phototropism, a response to external stimuli. This is an example of sensitivity (D), as plants detect and react to light to optimize photosynthesis.
Excretion (A) involves waste removal, nutrition (B) is about food intake, and respiration (C) is energy release. Since the question describes a directional growth response, the correct answer is D (Sensitivity).
Which process do living organisms use to remove excess carbon dioxide from their bodies?
A) excretion
B) movement
C) nutrition
D) respiration
▶️ Answer/Explanation
Ans: A
Excretion (A) is the process of removing metabolic waste products, including excess carbon dioxide, from the body. While respiration (D) produces carbon dioxide as a byproduct, excretion is the mechanism by which it is expelled, primarily through the lungs during exhalation.
Movement (B) and nutrition (C) are unrelated to waste removal. Thus, the correct answer is A (Excretion).