Chapter 7 Plant Nutrition - Worksheet

Jurongville Secondary School Secondary 3 Express Biology Tutorial Worksheet Syllabus 5100 Name: _________________________ (

)

Marks: _______ / 36

Class: Sec 3___ Chapter 7: 1.

Date: ____________

Plant Nutrition

Preliminary Concepts I [5 marks] The terms in the box are factors that affect the nutrition of green plants. Match (a) to (e) with one of these factors. T: Nitrates U: Water X: Magnesium ions

V: Chlorophyll W: Carbon Dioxide Y: Sunlight Z: Temperature

a. Which factor supplies energy for photosynthesis?

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b. Which “food” enters by osmosis?

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c. Which factor affects the activity of the enzymes in the chloroplasts?

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d. Which “food” enters the plant by diffusion only?

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e. Because of the presence of this factor, plants are the main food producers. _____ 2.

Preliminary Concepts II [9 marks] The terms in the box are parts of a leaf. Match (a) to (i) with one of these parts. S: Palisade Cells W: Stomata

T: Guard cells X: Xylem vessels

U: Epidermal cells V: Cuticle Y: Spongy mesophyll layer Z: Phloem

a. This tissue transports water to the palisade cells.

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b. These allow gaseous exchange between leaf and atmosphere.

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c. The cells in this part are arranged to provide a system of connecting air spaces within the leaf.

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d. This tissue conducts the products of photosynthesis from leaf to the rest of the plant.

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e. This part provides most of the support in leaves.

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f.

These control the rate of diffusion of gases through the stomata.

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g. This part prevents excessive evaporation of water from the leaf.

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h. These parts are the main site of photosynthesis in the leaf.

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i.

______

Chloroplasts are not present in this layer of cells.

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3.

Structured Question 1 [8 marks] Leaf discs cut out from a destarched plant were divided into four groups and labeled A, B, C and D. Groups A and B were floated on distilled water, while C and D were floated on 5% glucose solution. Group A was exposed to light, while the others were kept in the dark. Groups A, B and C had air but group D was kept in a vacuum (no air). After 2 days, all the leaf discs were treated with iodine solution. The table below summarizes the treatment given and the results of the iodine test. Leaf discs Floated on Conditions provided Iodine test

A Distilled water Light; air

B Distilled water Dark; air

C 5% glucose Dark; air

D 5% glucose Dark; vacuum

Blue-black

Pale brown

Blue-black

Pale brown

a. Explain the results obtained. [5] _________________________________________________________________ _________________________________________________________________ _________________________________________________________________ _________________________________________________________________ _________________________________________________________________ _________________________________________________________________ _________________________________________________________________ _________________________________________________________________ _________________________________________________________________ b. What inference can be made from the above experiment? [3] _________________________________________________________________ _________________________________________________________________ _________________________________________________________________ _________________________________________________________________ _________________________________________________________________ 4.

Structured Question 2 [14 marks] Diagram P shows an experiment to find the effect of temperature on the rate of photosynthesis. The average number of bubbles per minute at each temperature is given in the table.

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a. Plot a graph to show the relation between the rate of photosynthesis and temperature. [3]

b. Describe and explain the change in rate of photosynthesis as the temperature is changed

i. From 17°C to 30°C [3] ___________________________________________________________ ___________________________________________________________ ___________________________________________________________ ___________________________________________________________ ___________________________________________________________

ii. From 33°C to 42°C [2] ___________________________________________________________ ___________________________________________________________

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___________________________________________________________ ___________________________________________________________ c. Name the solution X that is usually used in this experiment to ensure that the water plant has a sufficient supply of carbon dioxide. [1] _________________________________________________________________ d. Name a water plant that can be used for this experiment. [1] _________________________________________________________________ e. Why should the funnel be raised by wooden supports? [1] _________________________________________________________________ _________________________________________________________________ f. i. Name the gas collected. [1] ___________________________________________________________ ii. What test would you do to identify the gas? [1] ___________________________________________________________ iii. What is the importance of this gas to other organisms in the ecosystem? [1] ___________________________________________________________ ___________________________________________________________

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