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Grade 11 LS 2023 Mid-year exam with marking guideline

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Grade 11 LS 2023 Mid-year exam with marking guideline. Questions are different scientific levels and degrees of difficulty. Term 1 and 2 content is tested as well as skills. Micro-organisms Plant biodiversity Animal diversity Photosynthesis Cellular respiration Animal nutrition

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SECTION A

QUESTION 1

1.1 Answer the following multiple-choice questions by choosing the most appropriate
answer. Write down only the letter of your choice. Example 1.1.11 A

1.1.1 Phylum of organisms that have nematocysts:

A Annelida
B Arthropoda
C Platyhelminthes
D Cnidaria

1.1.2 The following are characteristics of different plant groups:

(i) Vascular tissue
(ii) Seeds
(iii) Flowers
(iv) True leaves and roots

Which combination of features are typical of Gymnosperms?

A (i), (ii), (iii) and (iv)
B (i), (ii) and (iv)
C (i) and (iv)
D (ii), (iii) and (iv)

1.1.3 Form in which excess glucose is stored in the body:

A Glycogen
B Starch
C Urea
D Glucagon

1.1.4 When testing a leaf for starch, the leaf is boiled in alcohol to…

A dissolve the cytoplasm.
B remove the starch.
C remove the chlorophyll.
D stop metabolic processes.

1
© 2023 Tutorme LS. All rights reserved.

, 1.1.5 The following are involved in the process of cellular respiration:

1. Energy
2. Carbohydrates
3. Carbon dioxide
4. Water
5. Oxygen

Which ONE of the following equations correctly represents their involvement in
the above process?

A 2+3→1+4+5
B 2+4→1+3+5
C 1+2→3+4+5
D 2 + 5 →1 + 3 + 4

1.1.6 An investigation was carried out to test the effectiveness of four anti-fungal
treatments on preventing the growth of yeast. The results are shown in the
diagram below.




Which of the following is a correct conclusion made from the results?

A All anti-fungal treatments are equally effective.
B Mycoban is more effective than Fungiclear
C Fungisan can destroy yeast.
D Mycocide is most effective and Fungisan is least effective.

1.1.7 During anaerobic respiration in yeast cells…

A free oxygen is produced.
B alcohol is produced.

2
© 2023 Tutorme LS. All rights reserved.

, C a large amount of energy is produced.
D lactic acid is produced.
1.1.8 The chemical digestion of proteins in humans start in the...

A stomach
B mouth
C oesophagus
D small intestine.

1.1.9 The role of antigens in the body’s defense against disease:

A To bind to invading pathogens.
B To trigger tan immune response.
C To inactivate invading antibodies.
D To suppress the inflammation response.

1.1.10 The graph below shows the results of an investigation into the effect of carbon
dioxide concentration on the rate of photosynthesis. The investigation was carried
out under conditions of bright light. It was then repeated, using the same materials
and under the same conditions, but in light of medium intensity.



Y.
Rate of photosynthesis




X. bright light


Z.
medium light




Carbon dioxide concentration

What factor was limiting the rate of photosynthesis during the period marked X?

A Carbon dioxide
B Light
C Temperature
D Water

3
© 2023 Tutorme LS. All rights reserved.

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