Download Answers to REVISION QUESTIONS File

Answers to REVISION QUESTIONS
1. The roots anchor the plant to the ground and absorb water and minerals from the soil.
2. The flower contains the reproductive structures and enables the plant to reproduce itself.
3. The stem holds the plant upright so that the leaves can receive sunlight.
4. The leaves have a large surface area to absorb light and carry out photosynthesis.
5. Stomata are small openings on the leaf (more on the underside) surface which allow gases to come in and
out of the leaf. Watch as you dunk a leaf in boiling water and you will see bubbles of gas coming out of the
stomata.
6. The root hairs provide a very large surface area (lots of places) for the absorption of water and nutrients
from the soil.
7. The stigma is sticky and is the place where pollen (usually from another flower) sticks. The pollen grain
then produces a pollen tube which grows down through the style.
8. This is one of the veins in a plant. It carries sugars from the leaf to all parts of the plant.
9. This is another one of the veins in a plant. It carries water from the roots up to the leaves.
10. The sepals protect the developing flower bud.
11.
carbon dioxide + water
Glucose + oxygen
12.
Glucose (food) + oxygen
Carbon dioxide + water + ENERGY
13. Light ( this provides the energy for the reaction) and chlorophyll
14. This is the process where pollen from the anther is transferred to the stigma. This can be between plants
(cross pollination) or within the same flower (self pollination).
15. Feathery stigma, stamens that hang out of the flower, lots of light weight pollen, dull, small.
16. Large, brightly coloured, nectar, scent, upright stigma and stamens, less pollen, spikey pollen
17. This is the process where the sperm nucleus travels down through the style in a pollen tube and fuses(joins)
with the egg nucleus which is inside the ovule of the plant. The ovule is inside the ovary. The ovary then
swells to form a fruit and the ovule enlarges to become a seed. An embryo or baby plant grows inside the
seed.
18. This is when the seed absorbs water and swells, splitting the testa and grows a radicle (baby root) which
emerges from the seed.
19. Seeds dispersal is when the seeds from a plant are spread far and wide away from the parent plant. This is
so the seeds can grow in a place with plenty of space, light, water and nutrients and will not have to
compete with the parent plant for these resources. Seeds can be dispersed by the wind, water, animals or
explosively from the plant.
20. Digestion is the breakdown of large food molecules into small food molecules so they can be absorbed
through the intestinal wall and pass into the bloodstream. This is done by physical means (chewing in the
mouth and churning in the stomach as well as chemically using enzymes. These are chemicals which
breakdown our food into simple, small molecules. You need to learn the names of some and describe what
they do and where they do it!
21. Absorption is when small food molecules pass through the walls of the small intestine and move into the
bloodstream to be carried all over the body in our blood system.
22. Brown coloured iodine solution reacts with starch to produce a dark blue/black colour.
23. Copper sufate and sodium hydroxide react with protein to produce a purple colour.
24. A transparent stain remains on filter paper when the spot is dried.
25. Blue Benedicts solution is mixed with glucose (sugar) and heated. The solution turns a brick-red colour.
26. Fats are required for energy. They protect our internal organs and keep us warm .They provide buoyancy in
some aquatic animals.
27. Proteins are required for growth and repair of cells. They are also important as an energy source.
28. Carbohydrates are required for energy by the body.
29. Nectarines are dispersed by animals. They have fleshy sweet fruit which attracts animals who eat the fruit
and discard the seed. Perhaps the seed passes through the body and is excreted (a nectarine would be too
big for us to do that though!!)
30. Dandelion seeds are dispersed by the wind. They are light and fluffy and remain in the air a long time so
they can travel large distances.
31. Movement respiration sensitivity growth reproduction excretion nutrition