Unit 6 : Plant Nutrition

Question 1

Define Photosynthesis

Answer 1

the process by which plants manufacture carbohydrates from raw materials using energy from light

Question 2

Word equation for Photosynthesis

Answer 2

Carbon Dioxide&raquo_space;light +chlorophyll»> Glucose + Oxygen

Question 3

Balanced Chemical Equation for Photosynthesis

Answer 3

6CO₂ + 6H₂O&raquo_space;light+chlorophyll» C₆H₁₂O₆ + 6O₂

Question 4

Define Chlorophyll

Answer 4

a green dye that traps light energy and converts it into chemical energy to form carbohydrates and their subsequent storage

Question 5

What is Glucose used for?

Answer 5

for respiration, energy storage, cellulose cell walls, and making proteins and sugars

Question 6

4 Uses and Storage of the Carbohydrates made in Photosynthesis

Answer 6

starch as an energy store, cellulose to build cell walls, glucose used in respiration to provide energy, sucrose for transport in the phloem

Question 7

Use of Nitrate ions

Answer 7

making amino acids

Question 8

What does a Deficiency of Nitrate Ions cause

Answer 8

small plant due to slow / stunted growth

Question 9

Use of Magnesium Ions

Answer 9

making chlorophyll

Question 10

What does a Deficiency of Magnesium Ions cause

Answer 10

plant lacks chlorophyll, causing it to turn yellow.

Question 11

Define Limiting Factors

Answer 11

something present in the environment in such short supply that it restricts life processes

Question 12

How does Light Intensity affect Photosynthesis?

Answer 12

1. as the amount of light increases, the rate of photosynthesis increases {the limiting factor is light at this stage}
2. after a certain point, increasing the light intensity doesn’t affect the rate of photosynthesis {the limiting factor will now be carbon dioxide or temperature}

Question 13

Define Cuticle

Answer 13

the waxy layer that prevents water loss from the top of the leaf

Question 14

Define Upper/Lower Epidermis

Answer 14

transparent cell that allows sunlight to pass through to the palisade cell

Question 15

Define Palisade Mesophyll

Answer 15

is found at the top of the cell and contains many chloroplasts that absorb sunlight

Question 16

Define Spongy Mesophyll

Answer 16

irregularly shaped cells that create air spaces to allow the gaseous exchange to take place; do not contain many chloroplasts

Question 17

Define Vascular Bundles

Answer 17

made up of xylem and phloem

Question 18

Define Xylem

Answer 18

vessel which transports water and dissolved minerals and has lignified walls made of cellulose

Question 19

Define Phloem

Answer 19

a vessel that transports nutrients

Question 20

Define Stomata

Answer 20

little holes that open and close to allow the gaseous exchange to occur. The stomata are close to prevent water loss and open to letting gases in and out. When guard cells lose water, the stoma closes (at night), while the stoma opens when guard cells gain water & swell (during the day).

Question 20

Define Guard Cells

Answer 20

control the opening and closing of stomata