Life Sciences Paper 1

2295 Words Apr 11th, 2013 10 Pages
NATIONAL
SENIOR CERTIFICATE

GRADE 12

LIFE SCIENCES P1
FEBRUARY/MARCH 2011

MARKS: 150
TIME: 2½ hours

This question paper consists of 14 pages.

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Life Sciences/P1

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DBE/Feb. – Mar. 2011

INSTRUCTIONS AND INFORMATION
Read the following instructions carefully before answering the questions.
1.

Answer ALL the questions.

2.

Write ALL the answers in your ANSWER BOOK.

3.

Start the answers to EACH question at the top of a NEW page.

4.

Number the answers correctly according to the numbering system used in this question paper.

5.

Present your answers according to the instructions of each question.

6.

Do ALL drawings in pencil and label them in
…show more content…
Write A only,
B only, both A and B, or none next to the question number (1.3.1 – 1.3.5) in the ANSWER BOOK.
COLUMN I
1.3.1 Possible ways of improving of fertility 1.3.2 Forms the placenta
1.3.3 Having a single set of chromosomes 1.3.4 Sexually-transmitted disease(s) caused by bacteria
1.3.5 Technique used to determine abnormalities of the foetus

COLUMN II
A: Artificial insemination
B: In vitro fertilisation
A: Amnion
B: Chorion
A: Diploid
B: Haploid
A: Syphilis
B: HIV
A: Ultrasound
B: Amniocentesis
(5 x 2)

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1.4

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DBE/Feb. – Mar. 2011

When a stigma is ripe, it secretes a fluid which stimulates pollen grains to grow tubes. The fluid contains sugar.
Zama wanted to investigate the following question:
How does the concentration of sugar affect the number of pollen grains that germinate/form pollen tubes in flowers?
She designed the following investigation.


She took 5 cavity slides.
cover

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