6- Plant nutrition

Question 1

what is PS (photosynthesis)?

Answer 1

conversion of light energy to chemical energy by converting CO2 to H2O into carbohydrates

Question 2

what is the external structure of the dicotyledon

Answer 2

1. mid-rib
2. jagged sides
3. stalk
4. branching veins
5. wide leaf

Question 3

how is glucose used in the plant

Answer 3

1. respiration
2. making cellulose
3. making amino acids
4. stored as fats or oils
5. stored as starch

Question 4

what is a limiting factor

Answer 4

factor that is short supply in the environment that restricts life processes

Question 5

factors that limit PS

Answer 5

light
temp
CO2 conc.

Question 6

how to investigate CO2 conc. in the air

Answer 6

1. hydrogen carbonate indicator

a- purple : if concentration decreases
b- orange : normal conc.
c- yellow : as concentration increases

Question 7

how to improve plant growth

Answer 7

by creating ideal conditions for PS by:

a- enclosed glass house with perfect conditions
b- artificial lighting
c- glasshouse for optimum temperature
d- increasing CO2 conc.

Question 8

leaf structure

Answer 8

1. waxy cuticle
2. upper epidermis
3. palisade mesophyll layer
4. spongy mesophyll layer and vascular bundle
5. lower epidermis

Question 9

how are leaves adapted for efficient PS

Answer 9

1. broad leaves
2. chloroplasts in palisade mesophyll layer
3. upper epidermis is transparent
4. waxy cuticle to reduce water loss by evaporation
5. air spaces for gaseous exchange
6. lower surface full of stomata

Question 10

what are mineral ions needed by plants

Answer 10

1. Mg for making chloroplasts
2. NO3 for making proteins