Natural Science Term Test March 2014 Grade 9 Total: 80

Transcription

1 1 Natural Science Term Test March 2014 Grade 9 Total: 80 Time allocation: 90 minutes Life & Living Examiner: R. Swanepoel Moderator: R. Watson Name: Class: ******************************************************************************** Instructions: This question paper consists of two sections and eight questions. Answer all the questions on this question paper. If you drawings or graphs are asked, do it in pencil and label it in blue or black ink. If calculations are asked, show all steps. Write neatly and legibly. ******************************************************************************** Section A Question 1: A number of possible answers are given. Choose the correct answer and only cross out the appropriate letter. If the answer is not CROSSED OUT, NO MARK! 1.1 The organelle in a plant cell responsible for the storage of water, is the A. cell wall B. chloroplast C. vacuole D. nucleus 1.2 Where in a cell will you find DNA? A. Cell membrane B. Cytoplasm C. Nucleus D. Cell wall 1.3 Cells that have the ability to divide and develop into many different cell types are referred to as A. stem cells B. tissue C. microscopic cells D. animal cells

2 2 1.4 The process whereby the human body gets rid of undigested food through the anus, is A. ingestion B. egestion C. digestion D. indigestion 1.5 Which one of the following is a disease that affects the circulatory system? A. Ulcers B. Heart attack C. Rickets D. FAS 1.6 Which of the following statements best describes the process of gaseous exchange in the human body? A. In the lungs, the alveoli takes up the carbon dioxide and oxygen is released into the blood B. Oxygenated blood is transported from the lungs to the left side of the heart C. Diffusion of red blood cells takes place D. The combination of oxygen and food to release energy, water and carbon dioxide from cells. 1.7 Which of the following parts of the digestive tract forms a liquid is not a digestive enzyme, but assists in the digestion of food? A. Mouth B. Stomach C. Large intestine D. Small intestine 1.8 Which term is used to describe the process whereby an ovum and a sperm fuse? A. Menstruation B. Copulation C. Fertilization D. Pregnancy 1.9 Which of the following is a male reproductive hormone? A. Testosterone B. Testes C. Oestrogen D. Progesterone

3 Which of the following processes is NOT associated with the functioning of the kidney? A. Filtration B. Absorption C. Diffusion D. Egestion 10 Question 2: Fit the organ / tissue in column A to the correct function in column B. Only write down the LETTER of the function in the answer column. 5 Column A Answer Column B 2.1 Tendon 2.1 E A Secretes bile 2.2 Scrotum 2.2 G B Where only digestion of food takes place 2.3 Muscles 2.3 F C Where digestion and absorption of food takes place 2.4 Liver 2.4 A D Connects bone to bone 2.5 Intestines 2.5 C E Connects bone to muscle F Contracts and relaxes for locomotion G Regulates the temperature of the testes H Stores bile until it is needed Question 3: Give one word or term for each of the following statements. Only write down the word in the space provided The release of a ripe ovum from the ovaries. ovulation 3.2 The release of sperm from the penis. ejaculation 3.3 Another term used for pregnancy. gestation 3.4 The term given to a group of diseases which may be contracted when one person is having sexual intercourse with another infected person. STD s / Sexually transmitted diseases (NOT an example thereof, like AIDS) 3.5 The site where human fertilization takes place. Fallopian Tube Total Section A: 20

4 4 Section B: Answer the following questions. Use the space provided for your answers. Question 4: Study the following diagram and answer the questions that follow. Do not label this diagram. A B 4.1 Is this an example of a plant cell or an animal cell? 1 Animal Cell 4.2 Give three reasons, visible from this diagram, for your answer in Irregular shape Many, small vacuoles No chloroplasts present No cell wall present (Mark only the FIRST three answers) 4.3 Give appropriate labels for the following parts: 2 B : (cell) nucleus E: cell membrane 4.4 State the function of the following parts: 2 B: Contains the hereditary characteristics of the cell OR control all the functions of the cell C: Site for cellular respiration 4.5 Tabulate two differences between plant cells and animal cells. 5 Plant cells Animal cells Contains chloroplasts No chloroplasts One, big vacuole Many, small vacuoles, or it can be absent Cell wall and cell membrane present Only cell membrane present Rigid shape Irregular form Marking guideline: if a table is drawn with two columns and headings of columns per difference. if differences correlate. MARK FIRST TWO DIFFERENCES C D E

5 5 Question 5: You prepared a wet mount in class to study the structure of onion cells underneath the microscope. Study the diagram below and answer the questions that follow. 5.1 Explain the steps in a logical order that were followed to make a wet mount. 6 Peel an onion. Take one leaf and tear off the thin layer of the leaf. Place the leaf on a microscope slide. Place a droplet of iodine solution on the tissue. Cover with a cover slide. Place it on the stage of the microscope. Use the coarse and fine adjustment screws to focus on the tissue. MARK six steps in chronological order. 5.2 Why did you stain the cells with iodine solution? 1 To colour the starch in the cell

6 6 Question 6: Study the following diagram representing the human reproductive system and answer the questions that follow. F G H I 6.1 Write down the PROCESS taking place at the following numbered parts: H ovulation F fertilisation G menstruation / gestation / pregnancy 6.2 Explain the term menstruation. 3 The breaking down of the thick blood layer in the uterus and its excretion through the vagina 6.3 The following paragraph explains the process of human reproduction. Complete the paragraph by filling in the missing words. 10 Once a month, one ripe (a)ovum is released during ovulation. In preparation for fertilization, the (b)uterus develops a thick layer of blood. During copulation, (c)sperm is ejaculated into the female body. Sperm moves through the uterus and fertilizes the (d)ovum. The fertilized egg develops into a (e)zygote. This is implanted in the wall of the (f)uterus. (g)placenta forms to feed the developing foetus and to remove waste products. A baby is born on average (h)40 weeks after fertilization has taken place. There are two female hormones namely (i)oestrogen and (j)progesterone in the female body.

7 Number of children sufferering from Anorexia 7 Question 7 Study the following table regarding the age groups of sufferers of Anorexia nervosa that were hospitalized from 1999 until Answer the questions that follow. Age Sufferers admitted to hospital per year Under Older than What are the symptoms of Anorexia nervosa? 2 Dramatic weight loss Fixation on body image Harshly critical of appearance Little to no appetite MARK first two answers only. 7.2 Explain why there are so many sufferers between the ages of 19 and Peer pressure to be slim Lots of advertisements with thin bodies Bullying because of weight Beautiful clothes for thinner bodies MARK first three answers only. 7.3 Use the graph paper below and draw a line graph displaying the amount of Anorexia nervosa sufferers which were younger than 12 years. Marks will be allocated for the following: Heading of the graph, names and units on the axes, kind of graph and plotting of the graph. 6 Amount of children younger than 12 suffering from Anorexia nervosa from 1999 until Marking guideline: : heading with TWO variables (amount and years) Time on x-axis Years on x-axis Number on y-axis Line graph If ALL points are plotted correctly Time in years

8 8 Question 8 Write a short essay where you discuss the human nervous system using the following headings. Remember that you must use full sentences and not only words or terms. 8.1 Components of the nervous system 4 The nervous system consists of the brain, spinal cord, nerves, ears, nose, eyes, skin and tongue. (Marking guideline: award for 2 components) 8.2 Health issues that involves the nervous system 5 The diseases that may affect the nervous system are deafness, blindness, short sightedness. Drugs can have an effect on the nervous system as well as alcohol. 8.3 The main processes taking place in the human nervous system. 4 The main processes taking place in the human nervous system include hearing, seeing, feeling, tasting, smelling, sending and receiving impulses and the regulation of temperature. (Marking guideline: award 2 marks MAXIMUM for processing involving the senses and the other 2 marks for sending and receiving impulses and regulation of temperature) ALL THESE ANSWERS MUST BE IN THE FORM OF FULL SENTENCES. WHERE ONLY WORDS OR TERMS ARE GIVEN, NO MARKS WILL BE AWARDED FOR THE ANSWER. Total Section B: 60 Grand total: 80