Month: January 2018

Question 1:What is the function of flower petal in plant reproduction? Answer:Attracts insects for pollination. Question 2:Why is sepal different from petals? Answer:Sepal: usually green in colour and protects flower during the bud stagePetal: usually colourful to attract insects and animals. Question 3:Why do some papayas bloom but not bear fruits? Answer:Those papaya trees only … Read more

Question 1:List four factors of sterility in males and females. Answer:Factors of male sterility:(i) Low quality of sperm(ii) Low sperm count(iii) Testes cannot produce sperm(iv) ImpotentFactors of female sterility:(i) Ovaries cannot produce ovum(ii) Blockage in the Fallopian tubes(iii) Abnormal uterus(iv) Tumour in the uterus Question 2:What methods can be used to help a married couple … Read more

Question 1:Why does a pregnant woman need more nutrients? Answer:A pregnant woman needs more nutrients because the baby inside her uterus needs nutrients to grow healthily. Question 2:Why do the teeth and bones of a pregnant woman decay more easily? Answer:Baby absorbs calcium from the mother for the growth of its own teeth and bones. … Read more

Question 1:If embryo implantation occurs on the uterine lining, will menstruation occur? Answer:No Question 2:Explain the development of zygote after fertilisation. Answer:After fertilisation, zygote divides itself into a ball of cells called embryo. The embryo that is implanted on the uterine lining continues to develop into a foetus and eventually becomes a baby. Question 3:Complete … Read more

Question 1:Explain the phases of menstrual cycle. Answer:(i) Menstruation phase (Day 1 – 5)The uterine lining breaks down as menstruation begins and is discharged together with blood, unfertilised ovum and mucus.(ii) Repair phase (Day 6 – 11)Uterine lining starts to rebuild and thicken. Blood vessels in uterine lining are formed and ready to receive the … Read more

Question 1:What is the importance of the reproductive system to males and females? Answer:To produce offsprings. Question 2:State the functions of the urethra, penis and scrotum in the male reproductive system. Answer:Function of urethra: to discharge sperms (and urine) from the bodyPenis: Transfers sperms into the vagina during copulationScrotum: Holds and protects the testes Question … Read more

Activity 4.4:Aim: To discuss the changes that occur during puberty.Instruction1. List the physical changes that occur during puberty.2. Is it normal if an 18-year-old girl still has not had her menstruation yet? Explain your answer.3. Suppose that you work as a magazine editor for an advice column. A teenager wants your advice on a serious … Read more

Question 1:What are the differences between sexual and asexual reproduction? Answer: Question 2:State the parts of the following plants that reproduce vegetatively.(a) Onion  (b) Yam(c) Ginger (d) Lallang (e) Potato(f) Bryophyllum Answer:(a) Onion; bulb(b) Yam; stem(c) Ginger; stem(d) Lallang; stem(e) Potato; stem(f) Bryophyllum; leaf Question 3:What is the importance of reproduction to living things? Answer:Reproduction is … Read more

Activity 4.1:Aim: To gather and interpret information about sexual and asexual reproductionsInstruction1. Work in groups.2. Discuss the differences and similarities between internal and external fertilisation.3. Record your discussion in a table as below.4. Collect information from the Internet on the following types of asexual reproductions:(a) binary fission(b) budding(c) spore formation(d) vegetative reproduction(e) regeneration Answer:(a) Binary … Read more