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 biology movement in and out of the cell transport of molecules osmosis and plasmolysis plant water relation

Active absorption is affected by:

  1. Osmotic concentration

  2. Associate tissue structures

  3. Transpiration

  4. Sucking capacity of root hair
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Active absorption refers to absorption against the concentration gradient. Absorption of a solute from a region of low concentration to a region of higher concentration by the help of energy, is called active absorption. Hence, active absorption depends on osmotic concentration.

Multiple choice biology movement in and out of the cell transport of molecules osmosis and plasmolysis plant water relation

Minerals are absorbed by the plants, through

  1. Pressure flow

  2. Diffusion

  3. Active transport

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

Minerals are absorbed by plants through active transport as minerals are present in the soil mostly in the form of charged particles which fail to move across cell membrane and concentration of minerals in the cell is usually greater than that present in the soil solution. Therefore, most of the minerals are absorbed by active mechanism involving expenditure of energy in the form of ATP.

Hence, C is the correct answer.

Multiple choice biology movement in and out of the cell transport of molecules osmosis and plasmolysis plant water relation

Transporting pull arise mainly from

  1. Roots

  2. Leaves

  3. Stems

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

As water is lost from the surface of the leaves due to transpiration a strong suction force is transmitted through the active mesophyll cells to the ends of the water column in the root. This is called transpiration pull. It caused the entire water column to be pulled upwards. When the rate of transpiration is very high and the rate of absorption is slow the water in the xylem elements of the leaf develops a state of tension.

So, the correct answer is B.

Multiple choice botany know the plant world closely nutrition and its types types of nutrition in plants different modes of nutrition in plants

Parasitic phanerogams absorb water and solute from host plant by

  1. Mycorrhiza

  2. Clinging roots

  3. Adventitious roots

  4. Haustoria
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Parasitic plants are those which depend on other plants for their food either completely or incompletely. These plants produce a special organ called haustorium which produce adventitious roots to absorb food and nutrients.

So the correct option is D.

Multiple choice biology absorption by roots - the processes involved manure manures and fertilisers water absorption organ

Which of the following is an important feature of roots which help them to absorb water and minerals from the soil?

  1. Roots provide very less surface area

  2. Cells of root contain cell sap

  3. Root hairs have thick walls

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

Larger surface area and thinner walls of root hair are required to absorb water efficiently. 

Cells of the root contain sap which has an accumulation of ions which significantly reduces the water potential. Hence water enters the cells from the soil passively. 
So the correct answer is ' Cells of root contain cell sap'. 

Multiple choice biology absorption by roots - the processes involved manure manures and fertilisers water absorption organ

The cells of the roots contain cell sap at a .................. concentration than that of surrounding soil water.

  1. Higher

  2. Lower

  3. Equal

  4. All of the following
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The cells of the roots contain cell sap (solution) at a higher concentration than that of surrounding soil water. As a result, the water is absorbed by the root hairs. This is because the water always travels from a region of high water potential to the region of lower water potential. Here, the soil possesses a higher water potential as compared to the root hair.

Multiple choice biology absorption by roots - the processes involved manure manures and fertilisers water absorption organ

Rupture and fractionation of water column present in tracheary elements does not occur during ascent of sap due to

  1. Transpiration pull

  2. Weak gravitational pull

  3. Cohesion and adhesion

  4. Lignified thick walls
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Transpiratioal or gravitational pull exert strain so they are factors that can cause rupture of the column. 

Lignified walls are only present for structural support.
Cohesion ( attraction of water molecules towards each other) and adhesion (attraction of water molecules and the walls of the tube ) is the reason why  the column doesn't break as these attractive forces overcome the strain developed by Transpiration pull. 
So the correct answer is 'Cohesion and adhesion'.

Multiple choice biology plant kingdom and the environment around us some important plants uses of plants as medicine medicinal plants

Aquatic plants are covered with mucilage which 
a. Make different part of plant spongy 
b. Protects them from pathogens and animals 
c. Functions as lubricant 

  1. a, b

  2. b, c

  3. a, c

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

Aquatic plans are covered with mucilage which protects them from epiphytes, pathogens and animals. It also functions as lubricants. 

Multiple choice biology tissues, organs, organ system, organism defense mechanism in plants epidermal tissue system permanent tissues and their types

Which of the following is not a function of epidermis?

  1. Protection from adverse condition

  2. Gaseous exchange

  3. Conduction of water

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

Epidermis is a single layer of cells found on outer layers in different parts of a plant, viz., leaves, flowers, roots, stem, etc.  Its functions are as follows,

  • It forms a barrier between the underlying tissues in a plant and the surrounding environment, thereby, protecting it from adverse environmental conditions.
  • The presence of stomata and guard cells in the epidermal tissue helps in the exchange of oxygen, carbon dioxide as well as permit transpiration.
  • Conduction of water and minerals in plants takes place in conducting vessels, located in the core, called xylem. Thus conduction of water is not the function of the epidermis but, xylem.

Multiple choice botany tissues defense mechanism in plants epidermal tissue system permanent tissues and their types

Minerals salts are translocated through (i) along with the (ii) stream of water, which is pulled up through the plant by transpirational pull.
Fill up the blanks in the given statement and select the correct option.

  1. (i) - Xylem, (ii) - ascending

  2. (i) - Xylem, (ii) - descending

  3. (i) - Phloem, (ii) - ascending

  4. (i) - Phloem, (ii) - descending
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Mineral salts are transported from the roots to the rest of the plant through the xylem tissue. This movement is part of the ascending stream of water driven by transpirational pull.