WAEC Biology 2018/2019 Revised Questions & Answers | OBJ/Theory/Practicals

Latest Revised WAEC Biology 2018/2019 Questions & Answers | Today's OBJ/Theory/Practicals

This is the complete Revised WAEC Biology 2018/2019 Questions & Answers for Today's OBJ/Theory set by the West African Examination Council.

Biology 2018 Past Questions & Answers for WAEC, NECO, NABTEB, GCE

In the first place, the resources below on Biology have been provided by WAEC to assist you understand the required standards expected in Biology final Examination including objectives, theory and practicals.

Before you continue reading this topic, please it is very important that you know that all students performance in WAEC examination under review was done by the Chief examiner. You will see this while exploring official WAEC website like General Comment, Performance, Weaknesses, Strength and Expected Answers to Questions asked.

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Revised Question for Biology Practical

Study specimens T, V and W carefully and use them to answer questions 4(a) to 4(d).
(a) Classify specimens T, V and W according to the following criteria:
citrus fruit - labelled diagram

(i) agricultural classification;
(ii) life cycle. [6 marks]

(b) State two ways in which specimen W is important to human nutrition. [2 marks]
(c) With a scalpel or knife, make a cross section of specimen T.

(i) What type of placentation is observed in the cut section of specimen T? [1 mark]
(ii) Name one example of a fruit with similar placentation as observed in the cut section of specimen T. [1 mark]
(iii) Make a drawing 10 cm – 12 cm long of the transverse section and label fully. [10 marks]

(d) Make a transverse section of specimen V and state:

(i) three observable differences;
(ii) three observable similarities between the transverse sections of specimens T and V. [6 marks]

Study specimens Xi and Xii carefully and use them to answer questions
(e) (i) to (e) (iii).
(e) Carefully remove the bark of specimen Xi to expose the naked part.

(i) State two observable differences between specimens Xi and Xii. [2 marks]
(ii) If Xi and Xii are planted, what difference will be noticed after a month? [1 mark]
(iii) State one reason for the answer in 4 (e) (ii).

Observations by WAEC Examiners

Majority of the candidates did so well in answering questions 4 (a) (i), (a) (ii) and (c) (i) but lost some marks to spelling mistakes.

Many candidates answered questions (b) and (c) (ii) properly.
The drawing of transverse section of specimen T was answered quite well by some candidates but most lost marks to avoidable mistakes like in the title of the drawing and labeling properly.

Questions (d) (i), (d) (ii), (e) (i), (e) (ii) and (e) (iii) were answered correctly by many candidates

The expected answers are:

(a) Classification of specimens T, V and W according to

Agricultural method
  • T- Fruit crop
  • V- Vegetable crop
  • W- Root tuber
  • Life cycle
  • T- Perennial
  • V- Annual
  • W-Biennial

(b) Ways Specimen W is important to human nutrition

- Source of food/starch/carbohydrate;
- Energy is produced;
- Used for industrial purpose/employment/source of income.

(c) (i) Type of placentation
Axile

(ii) Example of a fruit with similar placentation

Garden egg; pepper; tomato or any other correctly named fruit.

Drawing/Diagram of the Transverse section/TS/Cross section of specimen T/Orange/Lemon/Lime/or any other correctly named Citrus fruit

TL- Title - Quality

  • NL- Neat Labels
  • CL- Clarity of Lines
  • Sz- Size (10-12cm)
  • Mg- Magnification (x½ – x2) Details
  • CS- Cut surface with double lines
  • PS- Placenta shown
  • JS- Juice sac/succulent hair shown

Labels
Epicarp; mesocarp; endocarp; placenta; seed

(d) (i) Observable differences between the cross section of specimens T/Orange and V/tomato

Specimen T/Orange/Orange/Lemon/Lime/Citrus fruit
Specimen V/Tomato

  1. Few or no seeds
  2. Many seeds present;
  3. Bigger/larger seeds
  4. Smaller seeds present;
  5. Epicarp/ mesocarp are hard
  6. Epicarp/ mesocarp are soft/juicy;
  7. Epicarp is yellowish/greenish
  8. Epicarp/ mesocarp is bright red;
  9. Small placenta;
  10. Big/large placenta;
  11. Presence of succulent hairs in the endocarp
  12. Juicy pulp/endocarp.

(ii) Observable similarities between the cross section of specimens

T/Orange/Lemon/Lime/Citrus fruit and V/tomato

(e) (i) Observable differences between Specimens Xi and Xii

Xi
  1. Both have fused epicarp and mesocarp;
  2. Both have seeds/berry;
  3. Both have succulent endocarp;
  4. Both have axile placentation;
  5. Both have are brightly coloured;
  6. Both are spherical in shape.

Xii
  1. No node present
  2. Node present
  3. No internode
  4. Internode present
  5. Scale leaf/bark absent
  6. Scale leaf/bark present
  7. White wood/colour seen
  8. Brown/Green stem

(ii) Difference to be noted
Xii will germinate while Xi will not germinate/will decay

(iii) Reason
Xii possesses axillary buds that will make it germinate but they were removed in Xi
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