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Biology
Photosynthesis
| Question | Answer |
|---|---|
| Word equation for photosynthesis? | Carbon Dioxide + Water ---> (light energy) glucose + oxygen |
| What might the rate of photosynthesis be limited by? | Low temperature Shortage of carbon dioxide Shortage of light |
| What happens during photosynthesis? | 1) Light energy is absorbed by a green substance called chlorophyll which is found in chloroplasts in some plant cells & algae 2) This energy is used to convert carbon dioxide (air) and water (soil) and sugar (glucose) 3) Oxygen is released as a by prod |
| What is needed to produce proteins? | Plants use nitrate ions absorbed from the soil |
| Where do Carnivorous plants such as the venus fly trap live? | They are adapted to living in nutrient-poor soil as they obtain most of their nutrients from the animals, such as insects that they catch |
| What happens in flowering plants? | Carbon dioxide enters the leaves by diffusion through the stomata Most of the water and mineral ions are absorbed by roots |
| What is the purpose of the surface area? | The surface area is increased by the flattened shape and internal air spaces |
| What is the purpose of the stomata? | The stomata obtains carbon dioxide from the atmosphere and removes oxygen produced in photosynthesis |
| Where do plans lose their water? | In their leaves. Evaporation is more rapid in hot, dry and windy conditions. If plants lose water faster than it is replaced by the roots the stomata can close to prevent wilting |
| What is the size of the stomata controlled by? | Guard cells which surround them |
| What is the function of the Xylem? | xylem tissue transports water & mineral ions around the roots from the stem and the leaves. the movement of water from the roots through the xylem and out of the leaves is called the transpiration system. |
| What is the function of the phloem? | phloem tissue carries dissolved sugars from the leaves to the rest of the plant, including the growing regions and storage organs. This is called translocation. |
| What are plants sensitive to and what are their scientific terms? | Light - phototropism Gravity - gravitropism Moisture - hydrotropism |
| What do the hormones do which are produced? | Co-ordinate and control growth. The hormone auxin phototropism and gravitropism |
| What are the responses of plant roots and shoot s? | Light, Gravity and Moisture are the result of unequal distribution of auxin causing unequal growth rates. |
| What do plant growth hormones do? | Used in agriculture and horticulture as weed killers and as rooting hormones |
| Describe the processes involved in sexual reproduction | 1) The anther produces male gametes in pollen grains 2) The pollen grains attach to the stigma on top of a carpel in which female gametes (ovules) are located 3) A pollen tube grows through the carpels style in the ovule |
| continue | 4) A pollen tube grows through the carpels style into the ovule 5) The nuclei from the pollen grain migrate into the ovule to fertilize the egg cell nucleus and endosperm nuclei 6) The resulting nuclei develops into an embryo |
| continued | 5) The endosperm and the female tissues of the ovule give rise to seed 6) The ovary then grows into a fruit, which surrounds the seeds |
Created by:
nicolelevy22
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