Chapter 3 Practice Paper: Nutrition and Transport in Flowering Plants — question paper (print)

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QQ/S4BI/CH3

Secondary 4 · Biology (G2 / G3)

Chapter 3 Practice Paper

Nutrition and Transport in Flowering Plants

Duration: 40 minutes

Total: 30 marks

Name:

Class:

Date:

READ THESE INSTRUCTIONS FIRST

Write your name, class and register number in the spaces at the top of this page.
Answer all questions.
Give numerical answers correct to 3 significant figures unless stated otherwise.
The number of marks is given in brackets [ ] at the end of each question or part question.
The total number of marks for this paper is 30.

Original practice material written for the MOE Biology syllabus. It is not an official MOE or school examination paper. Leaf structure and stomata; xylem and phloem; root hair cells; photosynthesis equations and limiting factors; the submerged-plant investigation; transpiration, its factors and wilting; translocation.

For Examiner’s Use
Section A	/ 10
Section B	/ 20
Total	/ 30

Section A: Multiple-choice questions[10 marks]

Choose the one correct answer for each question.

1
Which leaf layer is the main site of photosynthesis?
1. Athe waxy cuticle
2. Bthe upper epidermis
3. Cthe palisade mesophyll
4. Dthe lower epidermis
( )
2
Sucrose made in a leaf reaches a growing root tip through
1. Athe xylem, moving downward
2. Bthe phloem, by translocation
3. Cthe spongy mesophyll air spaces
4. Dthe stomata
( )
3
A bubble-counting experiment on pondweed gives 12 bubbles per minute at first and 24 bubbles per minute after the lamp is moved closer. The rate has increased by
1. A12%
2. B50%
3. C200%
4. D100%
( )
4
Water moves from the soil into a root hair cell because
1. Athe cell sap has a lower water potential than the soil solution
2. Bthe cell sap has a higher water potential than the soil solution
3. Cthe root hair pumps water in by active transport
4. Dthe cell wall drags water inward
( )
5
A detached leaf of mass 2.5 g loses 0.5 g of water in one hour. The percentage mass loss is
1. A12.5%
2. B20%
3. C25%
4. D80%
( )

Section B: Structured questions[20 marks]

Answer all questions in the spaces provided.

1
The described diagram shows a dicotyledonous leaf in transverse section: a waxy top layer, transparent cells beneath it, elongated cells densely speckled with green organelles, then loosely arranged cells with large gaps, a lower layer pierced by pores, and veins threading through the middle.
1. (a)
  Name the layer with the green-speckled elongated cells and state why it is the main photosynthesis site.
  [2]
2. (b)
  Name the pores in the lower layer, the cells that control them, and state two substances that pass through them.
  [3]
3. (c)
  State the function of the large gaps between the loosely arranged cells.
  [1]
2
A student investigates a submerged aquatic plant. With the lamp 40 cm away the plant releases 12 bubbles per minute; at 20 cm, 24 bubbles per minute; at 10 cm, 30 bubbles per minute; and at 5 cm, still 30 bubbles per minute.
1. (a)
  Calculate the percentage increase in bubble rate between 40 cm and 20 cm.
  increase =%[2]
2. (b)
  Identify the limiting factor between 40 cm and 20 cm, and explain what limits the rate at 5 cm.
  [3]
3. (c)
  State two variables the student must keep constant, and one precaution against the lamp heating the water.
  [2]
3
Water travels from the soil to the air, several metres up a tree trunk, through structures too small to see.
1. (a)
  Describe how a root hair cell is adapted for absorbing water, and name the process by which water enters it.
  [3]
2. (b)
  Name the tissue that carries the water up the trunk and state two structural features that suit it.
  [2]
3. (c)
  Explain what powers the upward flow, and state one condition change that would slow it.
  [2]

— End of paper —