Biology

Plant Transport and Physiology

2,012 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 biology movement and locomotion in living organisms movements in plants coordination in plants tropic and nastic movements in plants

............... is the movement of plant part in response to certain chemicals.

  1. Autotropism

  2. Chemotropism

  3. Phototropism

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

Chemotropism is the movement of plants in response to a chemical stimulus. A classic example of this type of movement is the growth of the pollen tube towards the ovule, during fertilization, in a flower.

Multiple choice biology movement and locomotion in living organisms movements in plants coordination in plants tropic and nastic movements in plants

The shoot system of any plant responds towards the stimulus of

  1. Air

  2. Light

  3. Water

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

Shoot system shows positive phototropism means it will grow or change its direction in the way where light is present. It is known as the directional movement of plant.

So the correct option is 'Light'.

Multiple choice biology movement and locomotion in living organisms movements in plants coordination in plants tropic and nastic movements in plants

A plant uses .......... means to transfer information from one cell to another as there is no specialized tissue present for the conduction of information. 

  1. Thermal

  2. Electrical

  3. Chemical

  4. Electrochemical
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
The most rapid methods of long distance communication between plant tissues and organs are bioelectrochemical signals. The action potential propagates rapidly throughout the plant along electrified interfaces. A potential pathway for transmission of this electrical signal might be the phloem sieve-tube system since it represents a continuum of plasma membranes. A phloem is an electrical conductor of bioelectrochemical impulses over long distances. At the cellular level in plants, electrical potentials exist across membranes, and thus between cellular compartments, as well as within specific compartments. Electrochemical phenomena are primary, and then deep cytophysiological reactions occur.

So, the correct answer is 'Electrochemical'.
Multiple choice biology movement and locomotion in living organisms movements in plants coordination in plants tropic and nastic movements in plants

Certain movements of plants do not result in their growth and are termed as movements which are growth

  1. Dependent

  2. Suppressive

  3. Independent

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

Growth independent movement is a directionless movement of the plant caused due to the variation of the outside environment and plants movement is neither toward nor away from a stimulus. The example is touch me not plant or Mimosa Pudica which fold its leaves due to touching. This movement is not involved in growth hence it is growth independent.

So the correct option is 'Independent'.

Multiple choice biology movement and locomotion in living organisms movements in plants coordination in plants tropic and nastic movements in plants

The growth of the shoot in the direction of source of light is an example of growth independent movement.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The growth of shoot is the directional movement of the plant that occurs in the direction of stimulus (light) and plant move towards the light and grows in that direction.

So the given statement is 'False'.

Multiple choice biology movement and locomotion in living organisms movements in plants coordination in plants tropic and nastic movements in plants

The movement of plant towards the direction of light is known as

  1. Ciliary movement

  2. Autotropic movement

  3. Phototropic movement

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

Photo means light and tropic means movement so the movement of plants towards light is phototropic movement and is usually shown by the stem of the plant that is why it is known as positively phototropic.

So the correct option is 'Phototropic movement'

Multiple choice biology movement and locomotion in living organisms movements in plants coordination in plants tropic and nastic movements in plants

Trophic movements are growth movements of plants in response to a stimulus from a specific direction.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

When a plant shows some growth movement in response to a stimulus, it is known as tropism. Tropism is direction specific and depends on the direction of stimulus. Plants may either show positive or negative movement as a response to a stimulus. If the movement is towards the direction of stimuli, it is known as positive tropism while movement away from stimuli is known as negative tropism. Answer is true.

Multiple choice biology movement and locomotion in living organisms movements in plants coordination in plants tropic and nastic movements in plants

Positive geotropism of root is due to greater growth on upper side as compared to lower side.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Geotropism is also known as Gravitropism. It is a phenomenon in which growth movement by a plant turns in response to gravity. Roots show positive geotropism as they grow towards the gravity while stems show negative geotropism as they grow upwards. Hence, root shows greater growth on lower side as compared to upper side in positive geotropism.

Thus, the correct answer is option B.

Multiple choice biology movement and locomotion in living organisms movements in plants coordination in plants tropic and nastic movements in plants

How does phototropism occur in plants?

  1. If a plant part moves towards the light,it is called positive phototropism.

  2. If a plant part moves opposite direction of light,it is called positive phototropism.

  3. If a plant part do not move towards the light,it is called positive phototropism.

  4. None of the above.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
  • Phototropism is the growth of organisms in response to a stimulus. This causes the plant to have elongated cells on the farthest side from the light. Phototropism is one of the many plant tropisms or movements which respond to external stimuli. 
  • Growth towards a light source is called positive phototropism, while growth away from light is called negative phototropism. Most plant shoots exhibit positive phototropism, and rearrange their chloroplasts in the leaves to maximize photosynthetic energy and promote growth.
    Hence, option A is correct.
Multiple choice biology movement and locomotion in living organisms movements in plants coordination in plants tropic and nastic movements in plants

Curling of tendrils is due to 

  1. Thigmotropism

  2. Phototropism

  3. Chemotropism

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

Tendrils are the threadlike organs of plants which are actually specialized stem, leaf or petiole and used for climbing, support or attaching to another for parasitic growth. Most climbing plants such as vines develop tendrils that tend to coil around objects that support it. This feature of the tendrils is due to a phenomenon called thigmotropism - directional growth movement of curvature in response to stimulus or contact.

Multiple choice biology movement and locomotion in living organisms movements in plants coordination in plants tropic and nastic movements in plants

Geotropic response of root is due to

  1. Higher auxin content of stem

  2. Higher growth on upper side of root

  3. Lower rate of growth in the stem

  4. Higher rate of growth in the stem
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Auxin is a plant hormone that plays important role in the growth of stem and roots to gravity. Gravitropism is a plant growth response to gravity. Root shows positive gravitropism and shoot shows negative gravitropism. Auxin content is lower on the upper side and more concentration occurs in lower side of the root and stem. This stimulates stem elongation and thus stem grows upwards. In roots, higher growth on upper side occurs due to lower auxin content. This inhibits root elongation and thus root grows downwards showing geotropic response. 

Thus, the correct answer is option B.

Multiple choice biology movement and locomotion in living organisms movements in plants coordination in plants tropic and nastic movements in plants

Tendrils and twiners come in contact with their support by means of

  1. Nutation

  2. Thigmonasty

  3. Thigmotropism

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

Nutation is the bending movements shown by some plant parts due to the unequal rate of growth of different parts of plants. Thigmonasty 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. The movement of plant part in response to contact with a solid touch is called as thigmotropism. The curvature movements due to support seen in tendrils and twiners is an example of thigmotropism. The movement of parts of a plant in response to air current is called as anemotropism. 

Thus, the correct answer is option C.

Multiple choice biology identifying the plants absorption of water from the soil root system the root system

Root cap takes part in

  1. Formation of new cells

  2. Absorption of water and minerals

  3. Protection of root meristem

  4. Storage of food
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Root cap takes part in the protection of root meristem because it is the layer separating the meristem from the external forces. It protects the tender apex while root makes its way into the soil.

So, the correct option is 'Protection of root meristem'.

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.