using the knowledge about experiments that are related to plant growth including those done by
fritz went to answer the questions above a) What was the HYPOTHESIS that went wanted to
answer (2ptsy? b) How did Went test his hypothesis (Pictures are ok as long as there are words
explaining the picture) (4ptsy! c) What was the final RESULT of Went\'s experiment (2pts)?
Solution
Cholodony- Went model decribes tropism in emerging shoots of monocotyledons, including the
tendencies of the shoot to grow towards light ( phototropism) and the roots towards downward
position ( Gravitropism).
In both the cases the directional growth is considered to be due to asymmetrical distribution of
Auxin, a plant hormone.
The rate of growth depends on the concentration of the auxin and both gravity and unidirectional
light effect the movement of auxin.
Basic Model: cholodony and went proposed that auxin is synthesised in the coleoptile tip which
senses light and sends the auxin down the shady side of the coleoptile.
Later experiments showed that auxin moved from a source along a horizontal coleoptile section,
concentrating along the bottom of the section and causing the shoot to bend upward.
The model was later extended to Gravitropism of roots where auxin was thought to inhibit rather
than stimulate growth and to accumulate in the lower side of the root section causing the root to
bend.
Result of Cholodony Went Model: Both phototropism and gravitropism is due to the
asymmetrical distribution of hormone auxin. The rate of growth is dependent on concentration of
auxin and both gravity and unidirectional light effect the movement of auxin..
Simple, Complex, and Compound Sentences Exercises.pdf
using the knowledge about experiments that are related to plant g.pdf
1. using the knowledge about experiments that are related to plant growth including those done by
fritz went to answer the questions above a) What was the HYPOTHESIS that went wanted to
answer (2ptsy? b) How did Went test his hypothesis (Pictures are ok as long as there are words
explaining the picture) (4ptsy! c) What was the final RESULT of Went's experiment (2pts)?
Solution
Cholodony- Went model decribes tropism in emerging shoots of monocotyledons, including the
tendencies of the shoot to grow towards light ( phototropism) and the roots towards downward
position ( Gravitropism).
In both the cases the directional growth is considered to be due to asymmetrical distribution of
Auxin, a plant hormone.
The rate of growth depends on the concentration of the auxin and both gravity and unidirectional
light effect the movement of auxin.
Basic Model: cholodony and went proposed that auxin is synthesised in the coleoptile tip which
senses light and sends the auxin down the shady side of the coleoptile.
Later experiments showed that auxin moved from a source along a horizontal coleoptile section,
concentrating along the bottom of the section and causing the shoot to bend upward.
The model was later extended to Gravitropism of roots where auxin was thought to inhibit rather
than stimulate growth and to accumulate in the lower side of the root section causing the root to
bend.
Result of Cholodony Went Model: Both phototropism and gravitropism is due to the
asymmetrical distribution of hormone auxin. The rate of growth is dependent on concentration of
auxin and both gravity and unidirectional light effect the movement of auxin.
