Science 8 Flashcards
Why do scientists say life depends on the sun?
Most producers use the sun for energy.
A cat eats a mouse that eats seeds from a plant. Classify all three organisms.
The plant is the producer, the mouse is the primary consumer, and the cat is the secondary consumer.
Why do chemists heat up their chemical reactions?
Higher temperatures help speed up most chemical reactions.
In this equation, where are the reactants?
2HCl + Zn = H2 + ZnCl2
HCl and Zn. Any numbers after chemicals are added.
In this equation, where are the products?
2HCl + Zn = H2 + ZnCl2
H2 and ZnCl2. Any numbers after chemicals are added.
In this equation, how many of each chemical is used? 2HCl + Zn = H2 + ZnCl2
Two HCl chemicals and One Zn.
In this equation, how many of each chemical is produced? 2HCl + Zn = H2 + ZnCl2
One H2 and One ZnCl2.
What is the chemical equation for photosynthesis?
6CO2 + 6H2O = C6H12O6 + 6O2.
What is not in the photosynthesis equation but is essential to the process?
Chlorophyll. It collects energy from the sun.
If you have a ball made of metal and a flat metal disc which will cool down faster?
The disc because it has a larger surface area.
If you put a plastic bag over a leaf why do water droplets form inside the bag?
It came from transpiration. Water evaporated from the leaves.
How do leaves get the water they need for photosynthesis?
They get it from the roots which get it from the soil.
How do leaves get the carbon dioxide they need for photosynthesis?
They get it from the air.
What are the openings on leaves called?
Stomata.
Where do you find most of the openings of leaves?
On the underside of the leave.
What do producers use oxygen for?
They use oxygen to burn food.
Why do producers make more oxygen than they need?
While making food they also make oxygen which other organisms breathe.
What do roots absorb other than water?
They absorb chemicals that the plant needs.
What helps roots absorb things from the soil?
Mycorrhiza
Whats the main difference between offspring made by vegetative reproduction and sexual reproduction?
Vegetative creates offspring with identical DNA to its parent. Sexual has DNA from each parent.
Describe how plants sexually reproduce using these words: Flower, Pollen, Stamen, Carpal, DNA, Embryo, Seed, Fruits, and Germinate.
Plants sexually reproduce by making flowers. The flowers have stamen that have half of one plant’s DNA and carpals that have half of the other plant’s DNA. The stamen produce pollen, which must get to the carpel in the flower of another plant. If that happens, the DNA from the pollen joins the DNA from the carpel to make the first cell of the new plant. An embryo is formed and packaged into a seed. The seed is then put into a fruit. The fruit takes the seed away from the parents, and if the seed ends up in good soil with water and sun, it will germinate and develop into a new plant.
What is the difference between a dicot and a monocot seed?
Monocot seeds have one cotyledon and Dicot seeds have two.
What do plants produce through photosynthesis?
Glucose and Oxygen.
What materials are needed for a plant to do photosynthesis?
Carbon dioxide, water, and energy from the sun.
