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Biology questions, chapter 3
Nama / NameKelas / ClassTarikh / Date

Nutrition in Plants

34 marks. Use Practice to check each answer as you go, or Exam to answer everything against the clock first.

Section A: objective questions

12 marks
Choose the best answer for each question.
1

Question 1

Which of the following is a micronutrient needed by plants?
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D
Iron is a micronutrient. Magnesium, potassium and sulphur are macronutrients.
For the teacher: Remembering, low difficulty, standard 3.1
Textbook p. 60
2

Question 2

Which three macronutrients are obtained easily from air and water?
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C
Carbon, hydrogen and oxygen come from air and water and make up most of the dry mass, so plants rarely lack them.
For the teacher: Remembering, low difficulty, standard 3.1
Textbook p. 60
3

Question 3

Mature leaves of a plant turn yellow, starting with the older leaves, and growth is stunted. Which nutrient is lacking?
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A
Nitrogen deficiency causes chlorosis, mainly of mature leaves, with stunted growth, because nitrogen is needed for chlorophyll and proteins.
For the teacher: Understanding, medium difficulty, standard 3.1
Textbook p. 61
4

Question 4

Which nutrient forms the central part of the chlorophyll molecule?
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C
Magnesium is the main component of the structure of chlorophyll.
For the teacher: Remembering, low difficulty, standard 3.1
Textbook p. 61
5

Question 5

In the NPK investigation, why are the culture bottles covered with black paper?
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B
Light would let green algae grow in the solution and compete with the seedlings for nutrients. The air pump supplies oxygen.
For the teacher: Understanding, medium difficulty, standard 3.1
Textbook p. 63
6

Question 6

In the NPK investigation, bottle B contains only distilled water. What is its purpose?
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A
Bottle B has no nutrients, so it is the control that is compared with the complete solution.
For the teacher: Applying, medium difficulty, standard 3.1
Textbook p. 64
7

Question 7

Which part of the root protects it from damage as it grows through the soil?
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B
The root cap covers the tip of the root and protects it.
For the teacher: Remembering, low difficulty, standard 3.2
Textbook p. 65
8

Question 8

Why does the cortex have loosely arranged cells?
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D
Spaces between loosely arranged parenchyma cells allow gases to exchange; the thin walls let water move through.
For the teacher: Understanding, low difficulty, standard 3.2
Textbook p. 66
9

Question 9

What is the function of the Casparian strip in the endodermis?
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C
Casparian strips are suberin or lignin thickenings in endodermal cell walls that control what passes into the vascular cylinder.
For the teacher: Understanding, low difficulty, standard 3.2
Textbook p. 67
10

Question 10

Which plant is an epiphyte?
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B
The bird's nest fern lives on a host to get sunlight and makes its own food. Rafflesia is parasitic; the other two are carnivorous.
For the teacher: Remembering, low difficulty, standard 3.3
Textbook p. 68
11

Question 11

Why do carnivorous plants digest insects?
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A
They live in soil with little nitrogen, so insects supply nitrogen for growth.
For the teacher: Understanding, low difficulty, standard 3.3
Textbook p. 69
12

Question 12

A plant grows on the stem of another plant, penetrates it up to the vascular bundles and the host eventually dies. Which statement describes this plant?
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D
Roots reaching the host's vascular bundles and a dying host describe a parasitic plant.
For the teacher: Analysing, high difficulty, standard 3.3
Textbook p. 68

Section B: structured questions

22 marks
Answer all questions. Write your answers in the spaces provided.
13

Question 13

Two plants, X and Y, are grown in culture solutions that each lack one mineral. Their symptoms are described below.
[2 marks] (a)Plant X has leaves that turn yellow, with older leaves falling off. State the mineral that is lacking and why the leaves are yellow.
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Tick each point you got.
[1 mark] (b)Plant Y has poor root growth and red or purple spots on old leaves. Name the mineral that is lacking.
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[1 mark] (c)State one function of potassium in plants.
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Any 1 points
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[2 marks] (d)Explain why magnesium deficiency affects photosynthesis.
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For the teacher: Understanding, low difficulty, standard 3.1
Textbook p. 61
14

Question 14

A student investigates the effect of nitrogen, phosphorus and potassium on the growth of corn seedlings using five culture bottles: A (complete solution), B (distilled water), C (without nitrogen), D (without phosphorus), E (without potassium).
[1 mark] (a)State the manipulated variable.
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[1 mark] (b)Which bottle shows the healthiest seedling?
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A
Bottle A holds the complete culture solution with all nutrients.
[1 mark] (c)Give one reason an air pump is connected to each bottle.
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[1 mark] (d)Why is the solution replaced every week?
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For the teacher: Applying, medium difficulty, standard 3.1
Textbook p. 63
15

Question 15

Diagram 1 shows the cross-section of a root.
Cross-section of a root with labelled tissues
Diagram 1
[1 mark] (a)Which description matches the endodermis shown in Diagram 1?
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The ring of closely packed cells around the vascular cylinder
The endodermis separates the cortex from the vascular cylinder.
[1 mark] (b)State the function of the xylem in the root.
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[2 marks] (c)Explain two adaptations of root hair cells for uptake of water and mineral salts.
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Any 2 points
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[2 marks] (d)Explain the importance of the Casparian strip.
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For the teacher: Understanding, low difficulty, standard 3.2
Textbook p. 66
16

Question 16

Mrs Rodiah grows an epiphytic orchid in a vase of coconut fibre, brick shards and charcoal shards, placed at a corner of her house.
[1 mark] (a)What is meant by an epiphytic plant?
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[1 mark] (b)Why does she not plant the orchid directly in the ground?
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Any 1 points
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[2 marks] (c)State the main factor she must consider before choosing the corner, and explain.
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[2 marks] (d)Give two differences between an epiphyte and a parasitic plant.
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Any 2 points
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For the teacher: Understanding, medium difficulty, standard 3.3
Textbook p. 68