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WorksheetsPhytonline
Total questions: 71
Worksheet time: 44mins
Auxins are responsible for _____________ of a plant
Colour change
Watering
Phototropism
Growth
Examples of dwarf plants where gibberellins cause rapid growth are
Grapes, Cabbage, Corn
Deciduous trees
Bananas, Avocado
Watermelon, Rockmelon, Honeydew melon
Phototropism is
The plant response to water
The plant response to light
The plant response to gravity
The plant response to soil
What happens when you place an over ripe banana in a fruit bowl with other fruit?
Nothing will happen
The other fruit will grow in size
Ethylene gas will cause the fruit to grow mold
Ethylene gas will cause the other fruit to ripen
In the story 'Jack and the beanstalk', Jack grew a beanstalk that grew way into the clouds. If I wanted to try and grow one myself, which plant hormone would I give my beanstalk?
Cytokinesis
Ethylene
Auxins
Gibberellins
If auxins are released down the stem of a plant, why doesn't the plant also grow on its side?
Because there aren't as many auxins released down the stem of the plant compared to the amount that grow at the top
Because there are vesicles along the walls on the sides of a plant which prevent growth
Because the growing bud at the top of the plant produces auxins at the same time which means growth on the side of the plant stops
Because toxic chemicals kill half of the active auxins in the bud which causes them to kill the others surrounding them. By the time the auxins start moving down the stem, they've already been killed off
Dormancy refers to
The growth of dwarf plants
Buds developing in winter which causes seed to grow longer
Buds that stop developing in winter which causes seeds not to grow
The reduced growth of dwarf plants
Where is auxin formed
Tip of stem and root
Leaves
Embryo
All
Promotes seed dormancy
abscisic acid
auxin
cytokinins
gibberellin
ethylene
Stimulates cell division
abscisic acid
auxin
cytokinins
gibberellin
ethylene
Causes the enlargement of fruits
abscisic acid
auxin
cytokinins
gibberellin
ethylene
May oppose the effects of auxins
abscisic acid
auxin
cytokinins
gibberellin
ethylene
Causes petals and leaves to drop
abscisic acid
auxin
cytokinins
gibberellin
ethylene
Promotes cell elongation
abscisic acid
auxin
cytokinins
gibberellin
ethylene
Stimulates dramatic stem growth
abscisic acid
auxin
cytokinins
gibberellin
ethylene
Stimulates new root growth
abscisic acid
auxin
cytokinins
gibberellin
ethylene
Inhibits cell division
abscisic acid
auxin
cytokinins
gibberellin
ethylene
What is the role of auxin that causes a plant to bend towards light?
The concentration of auxin in the plant increases when there is light.
Auxin causes uniform growth on every stem.
Auxin causes cells that are on the dark side to grow faster.
Auxin causes the increase in the number of plant cells.
The figure above shows a mimosa plant. What is the conclusion that can be derived based on the reaction in the figure.
The mimosa plant shows a seismonastic reaction.
The leaf of the mimosa becomes sturgid when touched.
The osmotic pressure in the mimosa cell increases when touched.
The temperature of the glass rod becomes very high until the leaf fades when touched.
The figure above shows the reaction of a plants to a stimulus. What is the reaction shown by the plants?
Thermonasty.
Thigmonasty.
Photonasty.
Seismonasty.
The figure above shows four coleoptiles P, Q, R and S that are exposed to unilateral light. After two days, which coleoptile will move towards the light?
P only.
R only.
P and R only.
P, Q and S only.
The movement of Euglena sp and Volvox sp. towards moderate light itensity is a type of reaction to an external stimulus. What is the reaction?
Photonasty.
Phototaxis.
Thermonasty.
Phototropism.
The figure above shows an experiment
that is done on two plants of the same species. Both plants are left in the open.
What will happen to the two plants after two weeks
I Plant B bends towards the opening of
the box.
II The auxin in stem A is distributed
uniformly.
III The auxin in stem B is not distributed
uniformly.
IV Plant A bends to the right.
I, II and III only.
I, II and IV only.
I, III and IV only.
II, III and IV only.
The figure below above shows an experiment to study the effect of auxin towards the growth of the coleoptiles. Which of the following conclusions are true about the experiment?
I Auxin is produced at the tip of the
coleoptiles and diffuses to the bottom to stimulate
growth.
II The supply of auxin is cut off in the
dark.
III Auxin cannot penetrate a mica plate.
IV Auxin can diffuse through a block of
agar-agar.
I, II and III only.
I, III and IV only.
II, III and IV only.
I, II, III and IV.
The diagram shows the same plant. Which of the following statements is not true
Plant b will be shorter than plant A
plant b produces lateral branches since the apical bud is removed
plant A shows apical dominance
plant a produces abscisic acid to prevend side branches from forming
Apical dominance which suppresses lateral bud development is caused by what hormone?
auxin
gibberellin
ethylene
imbibition
Which of the following are plant hormones
Auxin
Cytokinin
Gibberellin
Abcissic acid, ethylene
All
What is the reaction that is shown by the plant in the figure above?
Positive hydrotropism.
Negative phototropism.
Positive thigmotropism.
Negative geotropism.
which plant hormone produces opposite effects?
dormancy and cotyledons
dormancy and germination
auxin and cytokins
auxins and ethylene
Which plant hormone is a gas?
auxin
gibberellin
ethylene
cytokinin
Cytokinins are a class of plant hormones that help regulate growth by promoting cell division. Cytokinins are produced mainly in meristematic tissue, where most plant growth occurs. Which system carries cytokinins produced in the roots to the rest of the plant?
vascular system
dermal system
reproductive system
none of these
If you cut the top off a shoot the plant will
Die
Not grow
Grow straight up
Grow towards the light
Which hormone causes internodes to lengthen?
Gibberelins
Etiolation
Tropism
Cytokins
Which is an example of a nastic response?
Ivy twisting around another plant
A stem bending towards a light source
A root growing downwards in the soil
A venus flytrap closing
Which flower shows heliotropism
bougainvilla
rose
sunflower
datura
What is the role of auxin that causes a plant to bend towards light?
The concentration of auxin in the plant increases when there is light.
Auxin causes uniform growth on every stem.
Auxin causes cells that are on the dark side to grow faster.
Auxin causes the increase in the number of plant cells.
What does rooting hormone powder do?
encourages growth of flowers
encourages growth of stems
inhibits growth of roots
encourages growth of roots
How does ethylene work?
causes changes in fruit texture
causes changes in fruit colour
causes enzymatic breakdown of cell walls
all of the above
Which one of the following is a Precursor of Auxin?
Tryptophan
Kaurene
Zeatin
Methionine
Which one of the following is a precursor of plant growth hormone Ethylene?
Tryptophan
IAA
Pyrophosphate
Methionine
A cytokinin like substance isolated from milky endosperm of Zea mays is known as
Auxin
Nucellus
Zeatin
ABA
Which one of the following is an Anti-auxin?
TIBA
Phosphon-D
B-995
AMO-1618
What is the reaction of auxin upon exposing to sunlight?
No response
Move towards the exposed area
Move towards the shaded area
Move towards the bottom part of shoot
Which of the following statement is correct?
The lower the auxin in the shoot, the higher the growth rate.
The higher the auxin in the root, the higher the growth rate.
The higher the auxin in the shoot, the higher the growth rate.
The lower the auxin in the root, the lower the growth rate.
___________ is a technique to produce seedless fruits.
Parthenorcarpy
Tissue culture
Cloning
Genetic engineering
What are chemicals that transfer information in body called
Hormones
Vitamins
Enzymes
Neurons
The three species pictured do not share a common ancestor, yet have evolved to have a similar anatomy and life style. This is an example of ?
Homologous Structures
Divergent Evolution
Vestigial Organs
Convergent Evolution
The three species pictured share a common ancestor and have adapted so that each lives in a different environment. This is an example of
Law of Superposition
Evolutionary Arms Race
Divergent Evolution
Convergent Evolution
By what mechanism did the anoles on Puerto Rico diverge to occupy species specific niches?
Adaptive Radiation
Artificial Selection
Stabilizing Natural Selection
Coevolution
What branch is dedicated to studying the organism in the image?
Biogeography
Embryology
Ornithology
Ichthyology
Being able to find the three species of bears in North America is an example of ?
Convergent Evolution
Acquired Traits
Embryology
Biogeography
Which is not an element of Natural Selection
Over production
Struggle to Survive
Differential Reproduction
Genetic Drift
What natural phenomenon can disrupt the Law of Superposition?
Tsunamis
Natural Selection
Evolution
Tectonic forces
Carbon-14 can be use to determine the _______ _______ of a fossil.
Absolute age
Relative age
Vestigial organs
Analogous structures
Each successive generation of gazelles and cheetahs becoming progressively faster is an example of ?
Coevolution
Evolutionary Arms Race
Natural Selection
Convergent Evolution
The yucca moth depends on the small soap weed for food, and the small soap weed is only pollinated by the yucca moth. This is an example of
Evolutionary Arms Race
Convergent Evolution
Coevolution
Adaptive Radiation
According to fossil records, the horses that lived 50 million years ago were much smaller, weaker and slower than modern horses. Which process is most likely responsible for the changes that have led to the increased size, strength, and speed in horses?
evolution by natural selection
migration
inbreeding
commensalism
What is shown ?
embryology
fetalology
