Quiz 1

•Which of the following isn’t necessarily related ot sensation?

Response
Stimulus
Receiving.
Movement.

•Which of the following statements isn’t applied to auxins ?

They are greatly affected by the environmental factors.
They can't penetrate through the agar pieces.
They are used by the human to increase the rate of the plant growth.
They are chemical substances that are secreted by the plant buds

•What happens to the cells of the lower surface of pulvini at the base of the pinnate leaves of Mimosa plant, once shining the daylight ?

The water permeability to inside them decreases.
The salts permeability to outside them increases
The water permeability to inside them increases.
The salts permeability to inside them increases.

•When carrying out an experiment to verify the phototropism, a plant stem was exposed to light from one side only, which of the illustrated regions in the opposite figure has the highest rate of growth ?

X
Y
Z
L

•Which of the following characterizes the sensation in bean plant comparing to that in the spider?

it is less obvious.
It is more obvious.
It occurs without the action of hormones.
It reaches the highest degree of efficiency and accuracy.

The following figures represent a kind of plants that is characterized by the presence of spiral structures that help them in being attached to the support, which are called tendrils for normal growth. What is the factor which stimulates the tendrils of this plant to wrap around the supports?

A
B
C
D

A plant is put inside a beaker containing water, then it is exposed to light from one side for several days. Which graph represents the growth of the cells of the part that faces the light in the root of this plant ?

A
B
C
D

•Which of the following statements is correct ?

The presence of auxins in the cells always leads to their elongation.
The decrease of auxins from the cells always inhibits their growth.
The auxins are not related to the growth of cells.
The effect of auxins on the growth differs, according to the site of their presence.

•Which of the following illustrates the effect of high concentration of auxins ?

Increase in the elongation of root cells.
Increase in the elongation of root and stem cells.
Decrease in the elongation of stem cells.
Inhibition of the elongation of root cells.

•A student put a curved plant in a pot, then the pot is subjected to light as shown in the opposite figure. Which of the following observations describes the plant direction within several days ?

It grows in the direction of light directly.
Its growth continues away from light.
It grows vertically, then in the direction of light.
It continues growing upward

Sensitivity in living organisms

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