5090_w08_qp_2
A paper of Biology, 5090
Questions:
8
Year:
2008
Paper:
2
Variant:
0
Login to start this paper & get access to powerful tools
1
shows a seed before germination and shows the same seed after it has become a seedling. B C D A seed seen in section soil surface Identify structures A and B. A B Examiner’s Use Suggest a food likely to be stored at C. Explain how this food is made available for the process of germination, travels to D in , is used at D. On , use labelled arrows to show where a named gas enters and leaves the seedling during daylight hours.
16. Development of organisms and continuity of life  →  16.3. Sexual reproduction in plants
Open
2
Use shows the liver receiving chemicals from and sending chemicals to some other organs. I G F H hepatic portal vein (E) alimentary canal liver urethra out of body Identify organs G and I. G I Name the carbohydrate travelling in the hepatic portal vein (E), and explain how, on arrival in the liver, it is converted into a storage compound. named carbohydrate explanation Describe how the composition of the contents of F and H differ in a healthy person.
8. Human nutrition  →  8.3. Absorption and assimilation
13. Excretion  →  13.2. Urinary system
Open
3
Use shows a section through a leaf. J K L Identify structures J and K. J K On , use arrows to show the pathway taken by water from its arrival in this part of the leaf until it is lost into the atmosphere. Place a large X so that its arms cross as closely as possible to the point at which evaporation of water is occurring. Examiner’s Use c shows stomata as they appear in this leaf at three different times during the day. M N O c Using information provided in a and b, state which of the stomatal pores, M, N and O, in c, shows their appearance at the following times of day. 03:00 19:30 Suggest why the temperature inside the leaf never rises above 30 °C, even though the air temperature rises much higher than this.
7. Transport in flowering plants  →  7.2. Transpiration and translocation
6. Plant nutrition  →  6.2. Leaf structure
Open
4
Use shows human blood containing pathogenic (disease-causing) organisms. Name the liquid labelled Q in . Name two mineral ions which may be found in liquid Q and, for each ion, state its function in the body. ion 1 function ion 2 function On , label a white blood cell, a red blood cell infected with the pathogenic organism. The pathogenic organisms were introduced into the blood by a mosquito while feeding. Suggest why the mosquito feeds from a capillary and not from an artery. Q
11. Transport in humans  →  11.4. Blood
12. Disease and immunity  →  12.1. Disease
Open
5
Use shows changes in the uterus during the menstrual cycle. day R Identify R. State the days when each of the following processes are most likely to occur during the cycle. fertilisation implantation Suggest and explain why blood must not pass directly from the mother to the fetus during pregnancy, even though it contains substances necessary for fetal development. Examiner’s Use Table 5.1 shows that temperature determines whether the eggs of a particular species of reptile hatch into a male or a female. Table 5.1 temperature / °C % of females hatching % males hatching State the ranges of temperatures at which females are more likely than males to hatch from the eggs. and State three ways in which the production of a male human child differs from the production of the male form of this reptile. 1. 2. 3.
16. Development of organisms and continuity of life  →  16.4. Sexual reproduction in humans
Open