bio 5

Question 1

biochemical cycle

Answer 1

the cycle by which esential atoms are released and reused by nature.

Question 2

carbon cycle

Answer 2

how carbon dioxide is passed from one organism to another as they live and die.

Question 3

biological control

Answer 3

the use of living organisms to control the population of specific organisms.

Question 4

biochem oxygen demand

Answer 4

aerobic bacteria multiply in water quickly and need water.

Question 5

eutrophication

Answer 5

the process by which nutrients are added to water systems leading to the death of the organisms

Question 6

cell wall

Answer 6

prevents the bursting of the plant cell and gives it shape

Question 7

cell membrane

Answer 7

a selectively permeable membrane which controls the exchange between the cell and its environment

Question 8

cytoplasm

Answer 8

a site of chemical reaction of life

Question 9

nucleus

Answer 9

controls cell activity

Question 10

chromosomes

Answer 10

contain genetic info in the form of DNA

Question 11

mitocondrion

Answer 11

sight of energy prodoction

Question 12

permanent vacoule

Answer 12

important for exchange

Question 13

chloriplast

Answer 13

the area where photosynthesis takes place

Question 14

microbes

Answer 14

tiny microscopic organisms that cannot be seen by the naked eye

Question 15

tissue

Answer 15

a structure made up of many simular or identical cells which perform one specific function

Question 16

diffusion

Answer 16

the movement of molecules from an area of high concentration to an area of low concentration.

Question 17

osmosis

Answer 17

a process by which molecules move through a semipermeable membrane from an area of low concentration to an area of high concentration

Question 18

passive transport

Answer 18

movement across the cell membrane not requiring energy.

Question 19

active transport

Answer 19

the movement of ions or moecules across a cell membrane into a reigon of higher concentration assisted by enzymes or requiring enzymes

Question 20

net flow

Answer 20

an equilibrium in which their is no net movement

Question 21

turgid

Answer 21

hard

Question 22

flaccid

Answer 22

drooping or loose

Question 23

hypotonic

Answer 23

dilute

Question 24

hypertonic

Answer 24

concentrated

Question 25

autotroph

Answer 25

self feeder(plants)

Question 26

hetherotroph

Answer 26

feeds on other organisms

Question 27

saprophyte

Answer 27

feed on dead organic material

Question 28

equation of photosynthesis

Answer 28

carbon dioxide+water light/chlorophyll =glucose+oxygen.

Question 29

two stages on photosynthesis

Answer 29

light dependant | light independant

Question 30

adaptions for photosynthesis

Answer 30

* leaves grow broader and thinner to absorb as much light as possible * leaves are spread around to catch as much light as possible. * chloroplasts are most numerous in the top part of the leaf closest to the sunlight * a waxy cuticle prevents water loss from surfaces

Question 31

guard cells

Answer 31

* specialized epidermal cells that controll the opening and closing of the stoma * this is done by change in turgidly.

Question 32

photosynthesis

Answer 32

co2 diffuses into the cells , as co2 is used up in photosynthesis the concentration drops thus a greater concentration outside the cells causes it to defuse into them. water travels into the roots by osmosis then travels up the xylem vessels and into the leaf water moves by osmosis from cell to cell to the palasaide cells. chlorophyll trap the uv rays to be used in photosynthesis, The light splits the water molecules into hydrogen and oxygen and combine the carbon dioxide with the hydrogen to create glucose and a waste product water.

Question 33

is oxygen needed by plants

Answer 33

oxygen is needed in small quantity's for respiration

Question 34

list the limiting factors of photosynthesis

Answer 34

availability of water carbon dioxide concentration temperature light intensity

Question 35

how does temperature affect photosynthesis

Answer 35

the rate of reaction increases as temperature. with heat the molecules move around and come together faster. coldness limit the rate of photosynthesis because enzymes involved are not working at optimal temperatures

Question 36

how does carbon dioxide concentration affect photosynthesis

Answer 36

low concentrations of co2 slow the rate of photosynthesis.

Question 37

how does light intensity affect the rate of photosynthesis

Answer 37

light intensity varys throughout the day becoming a limiting factor

Question 38

how does water affect photosynthesis

Answer 38

dry soil limits the amount of hydrogen and oxygen available to plants to make food.

Question 39

etiolation

Answer 39

a process in which plants are grown in partial or no light * leaves are kept small and stored energy is used to elongate the stem in hopes of recieving sunlight * stems and leaves become pale and yellow