Sec 4 Combined Science (Biology) Nutrition & Transport in Flowering Plants topical questions

Name the leaf layer or structure described: (a) transparent protective layer; (b) layer with most chloroplasts; (c) pores for gas exchange; (d) tissue carrying water upwards.

State the word equation for photosynthesis, naming the conditions over the arrow.

Define (a) transpiration and (b) translocation.

State whether each factor makes transpiration faster or slower: (a) a fan blowing across the leaf, (b) humid still air, (c) bright light.

Describe the route of a carbon dioxide molecule from the outside air to a palisade mesophyll chloroplast.

Compare xylem and phloem: what each carries, the direction of flow, and their positions in a stem vascular bundle.

Explain how the root hair cell's structure suits it for absorbing water and dissolved mineral salts.

Pondweed releases oxygen bubbles that were counted with a lamp at different distances.

A student claims: "Water reaches the leaves because the stem roots suck it up like a straw from the bottom." Evaluate the claim and give the correct mechanism.

A potted plant is left in a hot, dry, windy spot and droops by afternoon. (a) Explain the wilting using the balance of water loss and uptake. (b) State how the plant partially brakes the loss. (c) State one cost of that brake to the plant.

Trace one sucrose molecule and one water molecule from their point of origin to a growing root tip, naming the tissue and process for each. (a) Water route and process. (b) Sucrose route and process. (c) State one similarity and one difference between the two transport systems.

Design a controlled investigation into the effect of air movement on transpiration rate using a leafy shoot and a potometer-style set-up that measures water uptake. (a) State the independent and dependent variables. (b) Name two variables to control. (c) Describe how results would be collected with and without a fan. (d) Predict and explain the outcome.