Plant Transport and Physiology

Paratonic or induced turgor movements are turgor movements induced by stimuli, such as light, temperature and contact. These movements are also called as nastic movements and may be of various types, such as
(i) Siesmonasty
(ii) Nyctinasty
Siesmonasty means a response to shaking. The best example is Mimosa pudica ("Touch - me - not" plant) which is the sensitive plant. Such plants respond to stimuli, such as touch, blow or mechanical shock by folding their leaflets and lowering their leaves. This effect is caused by a change in the turgidity of the leaflets brought about by the movement of water into and out of the parenchymatous cells of the pulvinus or swollen leaf base.
Nyctinasty or sleep movements are caused by relative changes in cell size on the opposite sides of the leaf base called pulvinus. The movements are attributed to the amount of auxin, $K^+$ ions and therefore the movement of water. Entry of water to the lower side of the pulvinus causes the leaves to stand erect and the exit of water causes them to droop.

Seismonastic movement is a response to touch or blow. In Mimosa pudica plant, turgor movement is seen in leaflets in response to touch. When it is touched, it begins to fold up and droop. Nyctinastic movement is the response of a plant in response to darkness. In this, plant shows circadian rhythm that function on a 24 hour clock. It is seen in leaves of many legume plants. Thigmonastic movement is the response of a plant to touch or vibration. In Drosera, tentacles bend towards the insect's direction after coming in contact. Chemonastic movement is the response of a plant to chemical stimulus. An example is growth of pollen tube towards embryo sac due to presence of sugar in the style.

Answer is option A i.e. "Thigmonasty"
Movement in the leaves of mimosa while you touch is called “nastic” movement. Nastic movements are reversible. It means that after some time plant leaf will comes to its original position. Thigmonasty is the nastic response of a plant to touch or vibration.

The leaves of Mimosa pudica show seismonasty. Its leaves respond to vibrations when they are touched or shaken. The speed of the response depends on the magnitude of the stimulus. Flicking the leaf hard will cause the leaf to close faster whereas a gentle touch at the tip of a leaf will lead to a slower response. Thus the correct answer is option A.

The leaf lamina and apex of pitcher plant form pitcher and lid respectively. The coloured lid and nectar attract the insects which are then drowned into acidic fluid of pitcher present at it bottom. Sitting of insects stimulates the closing of lid of pitcher which makes it an induced/paratonic movement. The vital movements of plant parts which are induced by any external factor (light, temperature, water etc) are known as induced or paratonic movements as opposed to the autonomic/spontaneous movements. Thus, option A is correct. 

Thigmonastic movements occur in some plants in response to tactile stimuli. The movements may be defensive or offensive-response to the touch of an herbivore interested in ingesting the plant or by contrast, in response to the touch of an insect that may serve as a potential meal for a carnivorous plant.

Phototaxis - is a kind of taxis or locomotory movement, that occurs when a whole organism moves towards or away from stimulus of light. It is called positive if the movement is in the direction of increasing light intensity and negative if the direction is opposite
So, the correct answer is 'Phototaxis'

Stimulus for flowering will be accepted by young leaves. Apart from light and chemical stimulus for flowering, temperature is also one important stimulus that a lot of plant species use to flower, e.g., some orchid species.

Opening of a bud and drooping of bud are called as epinastic movements. It is well defined as the increased growth of the upper surface of a plant part, such as leaf, resulting in a downward bending of the part.

Autonomic movement is the spontaneous movement of the protoplasm seen in aquatic plants due to internal stimulus. It is not related to the external stimulus. Movement of cilia and flagella is an example of autonomic movement. A movement shown by a plant part in response to an external factor is called as paratonic movement. In this, the direction of movement is controlled by the direction of the stimulus. Mechanical movements are seen by non-living organs of plants due to hygroscopic changes.

Nastic movements are responses of plant parts to stimuli. Nyctinasty is the rhythmic nastic movement of plant in response to the onset of darkness. Drooping of legume leaves in dark is due to nyctinasty. Seismonastiy is the nastic response of a plant to touch or vibration. Dropping of leaves of Mimosa pudica upon touching is due to seismonasty. 

Nastic movements are responses of plant parts to stimuli. Thermonasty is the a nastic response of plant in response to change in temperature. Thigmonasty or seismonasty is the nastic response of a plant to touch or vibration. Shock movements of leaves of Mimosa pudica leads to dropping of leaves due to seismonasty. Chemonasty is the nastic response of a plant to external chemical. 

Photonasty is the nastic movement shown by plant part in response to light. Thermonasty is the nastic movement shown by plant part in response to high temperature. Seismonasty is the nastic movement shown by plant part in response to touch. The response of plants due to reversible turgor change in pulvinus as a result of touch is due to seismonasty. Chemonasty is the nastic movement shown by plant part in response to the chemical.