1. The apparatus shown in Fig. 4.1 was set up under bright light for a period of five hours. At the start the apparatus was completely full of water. During this time, a gas was collected at the top of the graduated tube. rubber bung bright light gas 20 graduated tube 30 ood 40 50 00030 glass funnel, upside down pondweed Fig. 4.1 (a) (i) How would you show this gas was oxygen? ..***..* [1] (ii) Name the process within the plant responsible for the production of oxygen. ..[1] (iii) Determine the volume of gas collected in five hours and the rate of gas production per hour. volume.. . rate *** [2] (iv) How would you use this apparatus to obtain reliable results to show the effect of differing light intensities on the production of oxygen? *6*

the overall balanced equation

6co2 + 6h2o > c6h12o6 + 6o2

sunlight energy

where: co2 = carbon dioxide

h2o = water

light energy is required

c6h12o6 = glucose

o2 = oxygen

the correct answer is - d. china has a large and growing population.

the fact that china has a large (the biggest) population, and it is still growing, doesn't hinder the agriculture production in the country. in fact, it can for increased production in the agriculture, since there's more labor force, as well the sheer mass of people produces lots of scientists that come up with new inventions as to how to improve this sector. nice example is the inner mongolia region in china, in general dominated by the gobi desert, but few scientist came up with a nice idea as to how to make the region productive by using plants that are very resistant to droughts, so lots of people have been employed, and the region is becoming greener and greener each year, and the production of food in this region is also increasing.