Biology · Paper 2B · 2022
2 questions 🇹🇿 NECTA ✓ MS3-hour timed simulation · auto-graded · counts toward ranking
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Section A
You are provided with specimens A, B and specimen C. (a) Observe carefully the displayed reproductive system in the specimen A, then draw a well labelled diagram of the reproductive system only. (b) Carefully remove the sepals, petals and completely peel off the stamen tube to fully display carpel of specimen B, then draw a well labelled diagram of the carpel. (c) State four similar functions performed by reproductive system in diagram 1(a) and the carpel in 1(b). Present your work under criteria shown in the following table: Table of similarities in 1(a) and 1(b) Similar Functions S/N Criteria Reproductive system in 1(a) Carpel in 1(b) (i) Reception of gametes (ii) Production of gametes (iii) Fertilization site (iv) Zygote development (d) What is the type of reproduction exhibited by the plant which specimen C was taken? Give a reason to support your answer. (e) Briefly explain how the specimen C is propagated for reproduction of new plant. (f) In what ways the products from the specimen C is useful to human being. Give three points
- Observe carefully the displayed reproductive system in the specimen A, then draw a well labelled diagram of the reproductive system only. (5 mk)
- Carefully remove the sepals, petals and completely peel off the stamen tube to fully display carpel of specimen B, then draw a well labelled diagram of the carpel. (5 mk)
- State four similar functions performed by reproductive system in diagram 1(a) and the carpel in 1(b). Present your work under criteria shown in the following table: Table of similarities in 1(a) and 1(b) Similar Functions S/N Criteria Reproductive system in 1(a) Carpel in 1(b) (i) Reception of gametes (ii) Production of gametes (iii) Fertilization site (iv) Zygote development (8 mk)
- What is the type of reproduction exhibited by the plant which specimen C was taken? Give a reason to support your answer. (3 mk)
- Briefly explain how the specimen C is propagated for reproduction of new plant. (3 mk)
- In what ways the products from the specimen C is useful to human being. Give three points (4 mk)
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You are provided with specimens Q, R , S and T. (a) (i) Classify each of the specimens R, S and T to class level. (ii) State three reasons for placing the specimen S to its respective class in 2(a)(i). (b) Why is it important to understand the type of classification system used to place specimens R, S and T in their respective groups? Give one reason. (c) State three advantages of the members which have been placed together with specimen R in the same Class. (d) Why specimen Q is placed in the Division Bryophyta? Give two reasons. (e) Draw a well labelled diagram of specimen Q.
- (i) Classify each of the specimens R, S and T to class level. (ii) State three reasons for placing the specimen S to its respective class in 2(a)(i). (7 mk)
- Why is it important to understand the type of classification system used to place specimens R, S and T in their respective groups? Give one reason. (3 mk)
- State three advantages of the members which have been placed together with specimen R in the same Class. (6 mk)
- Why specimen Q is placed in the Division Bryophyta? Give two reasons. (4 mk)
- Draw a well labelled diagram of specimen Q. (5 mk)
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