Tag: movement in plants

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Multiple choice movement in plants living world of plants - plant physiology biology

On touching the leaves of Mimosa pudica, it droop down because of 

  1. Seismonasty

  2. Hydrotropism

  3. Chemonasty

  4. Thigmotropism
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Thigmonasty or seismonasty is the nastic response of a plant or fungus to touch or vibration. Examples are many species in the leguminous subfamily, Mimosoideae, active carnivorous such as Dionaea and a wide range of pollination mechanisms.

Multiple choice movement in plants living world of plants - plant physiology biology

Which movement occurs due to external stimulus?

  1. Tropic

  2. Nastic

  3. Tactic

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

External stimulus induces tropic, nastic and tactic movements.

  1. Tropic movement - biological phenomenon indicating growth or turning movement of a plant, in response to an external stimuli.
  2. Nastic movements - Non-directional responses in response to external stimulus
  3. Tactic movements - It includes phototactic, chemotactic and thermotactic movements.

Multiple choice movement in plants living world of plants - plant physiology biology

When spontaneous process occurs then free energy of a system _______________.

  1. Decreases

  2. Increases

  3. Remains same

  4. Either can decreases or increase
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

According to the second law of thermodynamics, spontaneous processes in a system at constant temperature and pressure occur with a decrease in Gibbs free energy.

Multiple choice movement in plants living world of plants - plant physiology biology

Nastic movements differ from tropic movements in being

  1. Movements of variation

  2. Nondirectional

  3. Directional

  4. Stimulated by chemicals
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Nastic movements are non-directional movements in which direction of response or movement is determined by the structure of responsive region. Nastic movement for instance, could be due to changes in the turgor pressure.

Multiple choice movement in plants living world of plants - plant physiology biology

Movement of plant part in response to touch is 

  1. Seismonasty

  2. Photonastic

  3. Nutation

  4. None of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Seismonasty is defined as the nastic movement in response to shock, especially rapid folding of te leaflets of the sensitive plant due to changes in turgor pressure caused by vibration. It is also called as thigmonasty, because the external stimuli is touch.

Multiple choice movement in plants living world of plants - plant physiology biology

Some flowers (e.g., Oxalis) open in the morning and close during evening.

because of

  1. Photonasty

  2. Phototropism

  3. Phototaxis

  4. Nyctinasty
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Photonasty - the tendency in certain plant species to respond to light by developing sufficient cellular force or growth on one side of an axis to change the form or position of the axis, as in the opening and closing of the flowers of four-o'-clocks.

Multiple choice movement in plants living world of plants - plant physiology biology

Closure of lamina in Venus Fly Trap (Dionaea muscipula) after an insect happens to alight over it is

  1. Thigmotropism

  2. Haptonasty

  3. Chemotropism

  4. Chemonasty
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Haptonasty or thigmonasty is the non-directional movement of a plant part in response to the touch of an object. The closing of the lamina of Venus fly trap is a type of haptonasty as a result of contact with an insect. If an insect happens to cross the lamina, the leaf will close quickly to prevent its escape. 

The directional growth movement of a plant part in response to the touch of an object is called thigmotropism. The climbing parts of the plant such as tendrils grow towards any support which they happen to touch  and wind around that support. 
The movement of a plant part in response to a chemical stimulus is called chemotropism. The growth of the pollen tube towards the ovule during the process of fertilization in a flower is an example of chemotropism. 
The non-directional movement of a plant in response to a chemical stimulus is known as chemonasty. The movement due to changes in turgor or changes is growth influenced by movement in ions is an example of chemonasty.
Thus, the correct answer is option B. 

Multiple choice movement in plants living world of plants - plant physiology biology

Movements of tentacles in Drosera are

  1. Photonastic

  2. Thermonastic

  3. Thigmonastic

  4. None of the above
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Nastic movements are responses of plant parts to stimuli. Photonastic movement is the nastic response of plant in response to light. Thermonastic movement is the a nastic response of plant in response to change in temperature. Seismonastic movement is the nastic response of a plant to touch or vibration. Dropping of leaves of Mimosa pudica upon touching is due to seismonasty. Thigmonastic movement is the nastic response of a plant to touch. The movements of tentacles of Drosera when comes in contact with insect is due to thigmonasty.

Thus, the correct answer is option C.

Multiple choice movement in plants living world of plants - plant physiology biology

On touching, the leaves of Mimosa pudica droop down because of

  1. Seismonasty

  2. Nyctinasty

  3. Chemonasty

  4. Thigmotropism
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Nastic movements are responses of plant parts to stimuli. Seismonasty is the nastic response of a plant to touch or vibration. Dropping down of leaves of Mimosa pudica upon touching is due to seismonasty. Nyctinasty is the rhythmic nastic movement of plant in response to the onset of darkness. Chemonasty is the nastic response of a plant to external chemical. 

Thus, the correct answer is option A.

Multiple choice movement in plants living world of plants - plant physiology biology

Which one of these examples shows nastic movement?

  1. Movement of roots downwards in the soil

  2. <p> Folding of leaves of Mimosa pudica when touched</p>

  3. Drooping of branch tips containing fully ripe fruit

  4. Climbing of grape vines
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Nastic movement is the movement shown by plant part in response to environmental stimuli. This movement is repeatable and reversible. Examples include the folding of leaves of Mimosa pudica when touched. The folding and recoiling of leaves of Mimosa pudica in response to touch is called as thigmonastic movement.

Thus, the correct answer is 'Folding of leaves of Mimosa pudica when touched..'