Biology 9700/42 — October/November 2023
Cambridge A-Level · A Level Structured Questions · worked solutions for every part, with the mark scheme
Topics Inheritance · Selection and Evolution · Classification, Biodiversity and Conservation · Homeostasis · Control and Coordination · Energy and Respiration · +2 more
Some organisms carry out respiration in anaerobic conditions when oxygen is not available or when there is a low concentration of oxygen. In yeast and some plants, this is called ethanol fermentation. In mammals, it is called lactate fermentation.
Fig. 1.1 outlines ethanol fermentation and lactate fermentation.
Identify substances A–D.
A ______
B ______
C ______
D ______
Explain how processes such as ethanol fermentation and lactate fermentation allow cells to continue to function in the absence of oxygen.
The cereal crop rice, Oryza sativa, grows in fields that are flooded with water. The roots of the rice plants are submerged in water that contains very little oxygen.
Describe and explain how rice plants are adapted to grow in flooded fields.
The rest of this paper
9 more questions- Q2Inheritance · Selection and Evolution · Classification, Biodiversity and Conservation14M
- Q3Selection and Evolution7M
- Q4Genetic Technology10M
- Q5Inheritance9M
- Q6Homeostasis14M
- Q7Control and Coordination9M
- Q8Photosynthesis12M
- Q9Homeostasis · Control and Coordination8M
- Q10Classification, Biodiversity and Conservation8M