ASSIGNMER (b) Fig. 7.2 shows the total cross-sectional area of the blood vessels in the systemie
circulation. It also shows the changes that occur in blood pressure and the speed
(velocity) of blood in the different blood vessels.
6.
vena cava
Bora
issue huid
SS
29
3
4000
total Cross-
3000
sectionarea
of the blood
vessels./ama 2000
1000
0
pressure
mean blood
Pressure / Pa
speed of the
blood /cm 5-1
50
-40
valocity
16112109876543210
30
-20
10
0
aorta
arteriales
arteries capillaries
veins
vena cava
Fig. 7.2
(i) State the maximum mean blood pressure in the aorta.
13 kPa
[1]
(ii) Describe how mean blood pressure and speed of blood change with cross-
sectional area of blood vessels, as shown in Fig. 7.2.
blood pressure
NSSCO BIOLOGY - ASSIGNMENT 1 - 2021
24​

Which of the following sex and generation combinations directly produces the pollen tube of angiosperms? a) male gametophyteb) female gametophytec) male sporophyted) female sporophyte

On a recent expedition to a remote region of northern canada, scientists uncovered skeletal remains from about 100,000 years ago. surprisingly, all the skeletal remains, which included many species from differing biological families and spanned about two thousand years, showed evidence of experiencing temperatures in excess of 1000 degrees fahrenheit (or 538 degrees celsius). which of the following, if true, best explains the apparent paradox between the cold environment and the evidence of the bones experiencing hot temperatures? (a) chemical changes that naturally occur during the process of decay in only one north canadian species produce the same evidence of the species' skeletons being exposed to hot temperatures as the expedition scientists found. (b) a little over 103,000 years ago, a large fire is known to have occurred in northern canada. (c) strong evidence exists that as early as 70,000 years ago, homo sapiens around the world relied heavily on fire to cook animals. (d) in the same expedition and in roughly the same layer of excavation, scientists found rudimentary wood cutting and hunting tools used by early humans.

Set comes up with for examples of sound waves ocean wave light wave and hand wave which of tonys examples is not an actual scientific wave