Biology

Plant Transport and Physiology

1,834 Questions

Access a comprehensive set of questions on plant transport mechanisms and physiological adaptations. Topics include water movement, translocation of food, and plant responses to external stimuli. These biology questions are essential for medical entrance exams and other science competitive tests.

Xylem and phloem transportTranspiration and evaporationPlant adaptationsGeotropic and phototropic responsesWater absorption by rootsRespiration in roots

Plant Transport and Physiology Questions

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

The closure of lid of pitcher in pitcher plant is 

  1. A paratonic movement

  2. A tropic movement

  3. A turgor movement

  4. An autonomous movement
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

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. 

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

Movements of trichomes in Drosera are

  1. Photonastic

  2. Thermonastic

  3. Thigmonastic

  4. Seismonastic
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

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.

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

Plant movement in response to diffuse stimulus of light is

  1. Phototropism

  2. Photolysis

  3. Phototaxis

  4. Photonasty
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

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'

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

Plant movements unrelated to external stimulus are

  1. Autonomic

  2. Paratonic

  3. Mechanical

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

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.

Thus, the correct answer is option A.

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

Drooping/folding of legume leaves in dark is 

  1. Temporary wilting

  2. Nyctinasty

  3. Seismonasty

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

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. 

Thus, the correct answer is option B.

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

Shock movements of leaves of sensitive plant, Mimosa pudica, are

  1. Thermonaty

  2. Seismonasty

  3. Hydrotropism

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

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. 

Thus, the correct answer is option B.

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

Response of plants due to reversible turgor change in pulvinus as a result of touch is

  1. Photonasty

  2. Thermonasty

  3. Seismonasty

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

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.

Thus, the correct answer is option C.

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

The closure of the lid of pitcher in pitcher plant is

  1. A paratonic movement

  2. A tropic movement

  3. A turgor movement

  4. An autonomous movement
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
Paratonic movements are some plants movements which are caused in response to certain stimuli and are said to be induced or plant movements which take place spontaneously , without any irritability or sensitivity of the protoplasm. Paratonic movements are of three kinds-Tropic, Tactic and Nastic movements. Tactic movements are movements of locomotion, which are induced by some unidirectional external stimuli. These directions are controlled by the direction of the stimulus. Depending upon the nature of the stimuli, these movements are of the following types- Phototactic, Chemotactic and Thermotactic. 
Pitcher plant are type of carnivorous plants. Foraging, flying or crawling insects such as flies are attracted to the cavity formed by the cupped leaf, often by the visual lures such as anthrocyanin pigments and nectar bribes. The rim of the pitcher is slippery when moistened by the condensation or nectares caused by insects falling into the trap. 
Multiple choice movement in plants living world of plants - plant physiology biology

Movements of leaves of the sensitive plant Mimosa pudica is due to

  1. Thermonasty

  2. Seismonasty

  3. Photonasty

  4. Nyctinasty
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
A response of a plant that causes movement independent of the direction of the stimulus is a nastic response. It is not a growth response. This type of response is reversible and can be repeated many times. Seismonasty is a nastic movement in response to shock.When the leaflets are touched, there is rapid folding of the leaflets of the sensitive plant due to changes in turgor pressure. Mimosa pudica is known as touch me not plant for this feature.
Thus, the correct answer is option B. 
Multiple choice movement in plants living world of plants - plant physiology biology

Thigmonastic movement is found in

  1. <p> Albizzia</p>

  2. <p> Oxalis</p>

  3. <p> Drosera</p>

  4. <p> Nepenthes</p>
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Thigmonastic movement is the nastic or nondirectional movement shown by plant part in response to the touch or vibration. Plants like Mimosa and Albizzia shows thigmonastic movement. Oxalis shows photonastic movement. Drosera shows haptonastic movement. 

Thus, the correct answer is 'Albizzia'.

Multiple choice zoology microbes in human welfare biofertilizers microbes as biocontrol agents and biofertilizers manuring

Mycorrhiza works as

  1. Modified leaf

  2. Mechanical support

  3. Root hairs in adverse condition

  4. Modified stem
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Mycorrhiza is the symbiotic relationship between fungi and plant roots in which both gets benefit from each other. Fungus acts as the plant's root hairs and acts as an extension of the root system for more absorption of nutrients and in turn receives carbohydrates (sugars) and growth factors from the plant, Plants with thick roots, poorly branched and with few root hairs, are usually more dependent on mycorrhizae for normal growth and development. Thus, the correct answer is option C.

Multiple choice botany biotechnology and its applications biotechnology in agriculture gm crops transgenic organisms

The introduction of t-DNA into plants involves

  1. Infection of the plant by Agrobacterium tumefaciens

  2. Altering the pH of the soil, then heat shocking the plants

  3. Exposing the plants to cold for a brief period

  4. Allowing the plant roots to stand in water
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Agrobacterium tumefaciens is a soil bacterium that naturally transfers a portion of its DNA, known as T-DNA, into the plant genome. Scientists exploit this natural mechanism to introduce foreign genes into plants.

Multiple choice biology plant growth other plant hormones cytokinins, ethylene and abscisic acid plant hormones

Fruit ripening is accelerated by

  1. Warm surroundings

  2. Increased nitrogen supply

  3. Reduced water supply

  4. Ethylene rich atmosphere
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Ethylene is a plant hormone. It is also called as ripening hormone. It is responsible for ripening of fruits. Fruit ripening is accompanied by increased rate of respiration. Ethylene rich atmosphere is used to accelerate the process of ripening of fruits like banana.

Thus, the correct answer is option D.