IB DP Biology A1.1 Water Exam Style Questions HL Paper 1

IB DP Biology A1.1 Water Exam Style Questions HL Paper 1 at IITian Academy focus on a specific topic or type of questions asked in actual exam. Questions are based on new syllabus for first assessment of 2025.

A1.1 Water Topics : Polarity, Hydrogen Bonding, Solvent Properties, Physical Properties, Consequences, Extraterrestrial Life

Question

Which characteristic of the ringed seal (Pusa hispida) is a consequence of the viscosity of water?

(A) Streamlined body
(B) Sharp teeth
(C) Claws
(D) Lungs

▶️ Answer/Explanation

Correct Answer: \( \boxed{\mathbf{A}} \)

Water has a high viscosity, creating drag that resists movement. A streamlined body helps the ringed seal reduce this resistance, allowing it to swim efficiently while conserving energy. This adaptation is a direct consequence of moving through water.

Question

Which symbol indicates the polarity of the oxygen atom in the water molecule?

(A) δ⁺
(B) δ⁻
(C) +
(D) −

▶️ Answer/Explanation

Oxygen is more electronegative than hydrogen, so it attracts the shared electrons in the covalent bonds more strongly. This gives oxygen a partial negative charge, represented by the symbol δ⁻.
✅ Answer: (B)

Question

Which property of water helps aquatic habitats maintain stable temperatures throughout the year?

A. High specific heat capacity because covalent bonding restricts molecular motion
B. Low specific heat capacity because covalent bonding restricts molecular motion
C. Low specific heat capacity because hydrogen bonding restricts molecular motion
D. High specific heat capacity because hydrogen bonding restricts molecular motion

▶️ Answer/Explanation

Water has a high specific heat capacity due to extensive hydrogen bonding between molecules. These bonds absorb and release heat slowly, preventing rapid temperature changes in aquatic ecosystems.
✅ Answer: (D) High specific heat capacity because hydrogen bonding restricts molecular motion

IB DP Biology A1.1 Water Exam Style Questions HL Paper 1