Plant structure adaptations and responses

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GAS EXCHANGE: Allows CO2 in & O2 out of leaf

TRANSPIRATION: Allows excess H2O out of leaf

Slide # 8

Stoma

Slide 9

Slide # 9

Stoma Open

Stoma Closed

Guard Cells

Stoma

Function of Stomata

Guard Cells

What process involves using CO2 and H2O releasing O2 as a waste product?

Photosynthesis

What is the plant using this process to make?

Carbohydrates-glucose

If the plant needs water for photosynthesis, why is water coming out of the stoma?

Slide 10

Slide # 10

Stoma Open

Stoma Closed

Guard Cells

Function of Guard Cells

Guard Cells

These stomata (leaf openings) naturally allow water to evaporate out.

Why would the plant close stomata with guard cells?

Prevent excess water loss through transpiration. (conserve water)

So what is the point of having stomata?

Allow gas exchange for photosynthesis

Slide 11

Slide # 11

A average size maple tree can transpire 200 liters of water per hour during the summer.

Transpiration is the #1 driving force for pulling water up stems from roots.

Plants find a use for Transpiration

Transpiration: loss

of excess water from plant leaves

2. Significance:

B

A

Transpiration causes enough pressure to help pull water (& required nutrients) up stem from roots.

As part of the water cycle, trees transpire water back into the atmosphere.

Transpiration provides much of the daily rain in rainforest.

Slide 12

1.Pistil:female reproductive structure

Stigma: sticky tip; traps pollen

Style: slender tube; transports pollen from stigma to ovary

Ovary: contains ovules; ovary develops into fruit

Ovule: contains egg cell which develops into a seed when fertilized

Slide # 12

Structure of a Flower

Slide 13

Stamen: male reproductive structure

Filament: thin stalk; supports anther

Anther: knob-like structure; produces pollen

Pollen: contains microscopic cells that become sperm cells

Structure of a Flower

Slide # 13

Slide 14

Sepals: encloses & protects flower before it blooms

Petals: usually colorful & scented; attracts pollinators

Structure of a Flower

Slide # 14

Slide 15

Cross Pollination

Slide # 15

How does pollination happen?

Pollen from an anther is caught by the stigma, travels through style to the ovules in the ovary.