FORM SIX BIOLOGY NECTA 2016
THE UNITED REPUBLIC OF TANZANIA NATIONAL EXAMINATIONS COUNCIL
ADVANCED CERTIFICATE OF SECONDARY EDUCATION
EXAMINATION

133/2 BIOLOGY 2

For Both School and Private Candidates)

Time: 3 Hours Tuesday, 10" May 2016 p.m.

Instructions

  1. This paper consists of eight (8) questions in sections A. B. C and D.
  2. Answer five questions by choosing at least one (I) question from each section.
  3. Each question carries twenty (20) marks.
  4. Except for diagrams that must be drawn in pencil, all writing should be in blue or black ink.
  5. Cellular phones are not allowed in the examination room.
  6. Write your Examination Number on every page of your answer booklet(s).

SECTION A

1.(a) Give five reasons to justify the class to which cockroach belongs.

View Ans


(b) Using examples, explain seven advantages of insects to human beings.

View Ans


2.Using diagrams and one example in each case, classify bacteria on the basis of their morphology.

View Ans


SECTION B

3.(a) Explain four major roles of the kidney.

View Ans


(b) Describe the structure of the mammalian nephron.

View Ans


4.Explain different ways used by endotherms to keep their body temperature constant.

View Ans


SECTION C

5. (a) Explain the following types of growth; give one example in each case

(i) Intermittent growth

(ii)Allometric growth

(iii)Isometric growth

(iv)Limited growth

(v)Unlimited growth

View Ans


State the roles of the following factors in seed germination:

(i)Water

(ii)Air

(iii)Optimum temperature

View Ans


6. In guinea pig (Cavia), there are two alleles for hair colour, black and white, and two alleles for hair length, short and long. In a breeding experiment all Fl phenotypes produced from a cross between pure-breeding short-black haired and pure-breading. long white-haired parents and short black hair.

(a) Which alleles are dominant? Give reason for your answer. (b) Use cross diagrams to show both Fl and F2 results.

View Ans


SECTION D

7. Explain how different abiotic factors affect population distribution

View Ans


8. Describe the types of communities (Biomes) and their global distribution

View Ans


Download Learning
Hub App

For Call,Sms&WhatsApp: 255769929722 / 255754805256

GO TO NECTA EXAMS