IB myp 4-5 Biology – Practice Questions- All Topics
Topic :Organsims-Unity and Diversity in life forms
Topic :Organisms– Weightage : 21 %
All Questions for Topic : Habitat,Ecosystem,Inter dependency,Unity and diversity in life forms,Energy transfer and cycles,Classification
Question:
Which was losing more heat to the surroundings, the spider or the hands? Give reasons for your answer.
▶️Answer/Explanation
Ans: Hands are losing more heat; hotter objects lose more heat than cooler ones; spider is at 22.8 °C or less and hands are at 35.9 °C or more.
Question:
Using all the data in the table, explain how western spadefoot toad tadpoles respond to a low-water environment.
▶️Answer/Explanation
Ans: More corticosterone is produced in low water; causing production of more thyroid hormone receptor proteins; more thyroid hormone is produced in low water; which activates receptor
proteins by binding; and the activated receptors bind to specific genes in the nucleus; activating them; activated genes cause metamorphosis.
Question:
Suggest advantages to the western spadefoot toad of being able to metamorphose at different times in response to water levels.
▶️Answer/Explanation
Ans: Metamorphosis happens before the water disappears; but there is growth to the largest possible size before metamorphosis.