1.1 Respiration and Gas Exchange in Plants

Question 1

process in which energy from organic molecules are released to be used in different life processes in an organism

Answer 1

respiration

Question 2

refers to breakdown of carbohydrates in cells

carb+O2 -> CO2+H2O+energy

Answer 2

respiration

Question 3

gases are exchanged in the air by animals

Answer 3

breathing

Question 4

why is respiration in plants not very obvious?

Answer 4

photosynthetic process makes more oxygen than he respiratory process needs

Question 5

the no. of carbon dioxide in photosynthesis is _____ than what is given off during respiration

Answer 5

higher

Question 6

what happens in respiration at night?

Answer 6

oxygen is taken in and carbon dioxide is realeased

Question 7

why is respiration is higher at night?

Answer 7

light is absent

Question 8

what is the difference of respiration from breathing

Answer 8

• respiration is a chemical process, while breathing is a physical process
• respiration involves taking oxygen from lungs into the blood stream and cells while breathing involves taking oxygen into lungs

Question 9

why do plants not need respiratory organs?

Answer 9

oxygen requirements are met by photosynthesis

Question 10

where does photosynthesis occur?

Answer 10

chloroplasts

Question 11

what happens when oxygen is directly released into plant cells

Answer 11

minimal gas transport from one plant to another occurs

Question 12

how does gas exchange occur in small plants

Answer 12

by diffusion

Question 13

why can gas exchange in plants occur through diffusion?

Answer 13

because leaves and other structures are very thin

Question 14

how does gas exchange occur in complex plants?

Answer 14

through stomata and lenticels

Question 15

where does the oxygen that roots absorb come from?

Answer 15

from the air spaces in the soil

Question 16

what are root hairs?

Answer 16

hair-like extensions of root epidermal cells

are in direct-contact with soil

Question 17

can oxygen and carbon dioxide easily diffuse in and out of root hairs?

Answer 17

yes

Question 18

how are oxygen and carbon dioxide absorbed by the roots distributed to other parts of the plant?

Answer 18

through diffusion

Question 19

what happens when the soil is waterlogged?

Answer 19

roots will not be able to take in oxygen which will affect metabolic processes

Question 20

it is contained in the layers of dead cells covering the stems of mature and woody plants?

Answer 20

suberin

Question 21

what other part of a stem can gas exchange occur?

Answer 21

lenticels

Question 22

the non-subersized pores/openings on corks of mature roots and woody plants

Answer 22

lenticels

Question 23

they enable exchange of air between air and cells in the interior tissues of the plant

Answer 23

lenticels

Question 24

what does suberin feel like?

Answer 24

waxy, waterproof, and airproof

Question 25

where does the gas exchange of a plant occur the most?

Answer 25

in its leaves

Question 26

what occurs in the plant at daylight?

Answer 26

photosynthesis | carbon dioxide is taken in and oxygen is released

Question 27

what occurs in the plant during night?

Answer 27

respiration | oxygen is taken in and carbon dioxide is released

Question 28

this enables the diffusion of gas through the intercellular spaces in the leaves

Answer 28

stomata

Question 29

it opens when exposed to sunlight

Answer 29

stomata

Question 30

what regulates opening and closing of the stomata

Answer 30

water

Question 31

when there is more water, cells are ____ and ____

Answer 31

turgid; open