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 adapting to a habit extreme adaptations adaptive features adaptations of organisms

' Pebble plant ' have 

  1. Leave modified to spines

  2. Leaves are absent

  3. Leaves are swollen

  4. Leaves modified to reduce transpiration
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Lithops plants or Pebble plant consist of one or more pairs of bulbous, almost fused leaves opposite to each other and hardly any stem. The slit between the leaves contains the meristem and produces flowers and new leaves. The leaves of Lithops are mostly buried below the surface of the soil, with a partially or completely translucent top surface known as a leaf window which allows light to enter the interior of the leaves for photosynthesis. 

So the above selected option is correct 

Multiple choice biology adapting to a habit extreme adaptations adaptive features adaptations of organisms

The biological adaptation that allows frogs to obtain water for their survival during conditions of water scarcity is the

  1. Presence of modified tongue that acts like a sponge to suck water from damp soils

  2. Presence of water channels in the skin by which they absorb water from their surroundings

  3. Presence of ciliated oesophagus that helps in separating water from ingested particular matter

  4. Selective feeding on plants with large amount of water that would fulfill the water requirement
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

In the conditions of water scarcity, the frogs show biological adaptation to reduce water loss or obtain water from the surroundings. The skin is modified to contain water channels. The water is absorbed from the surroundings through the skin and the water channels makes the water available for the survival. 

Thus, the correct answer is option B. 

Multiple choice economics environmental economics acid rain air pollution - effects and control air pollution and its effects

How does acid precipitation(acid rain) affect plants?

  1. It releases H$+$ ions, thereby increasing the of rate photophosphorylation in green cells

  2. It precipitates organic acids in palisades cells of leaves, thereby inhibiting respiration

  3. It injuries foliage leading to reduction in photosynthesis, biomass and occasionally death

  4. It precipitates toxic nutrients in soil leading to growth inhibition in trees
Reveal answer Fill a bubble to check yourself
A Correct answer
Multiple choice botany ecological adaptations, succession and ecological services plant adaptation adaptation in plants plant habitat importance and classification of angiosperms

Which of the following is not an adaptive feature of plants growing in physiologically dry soil?

  1. Pneumatophore

  2. Vivivary

  3. Sunken stomata

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

Physiologically dry soil means that water is present in soil but due to high levels of salt, it is not available to plants as plants cannot easily absorb the water present in soil. Such plants are called halophiles, e.g., mangrove plants like Sonnertia, Rhizophora, Avicennia etc. Such plants show several unique features such as presence of pneumatophores and vivipary. Sunken stomata is not shown by mangroves but is shown by xerophytes which grow in physically dry soil. Thus, the correct answer is option C.

Multiple choice botany male & female gametophytes: structure and development pollen grain androecium male gametophyte

Which one is resistant to enzyme action?

  1. Pollen exine

  2. Leaf cuticle

  3. Cork

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

The pollen exine of the pollen grains consists most resistant biological material known as Sporopollenin. It is resistant to both microbial and chemical decomposition by which it preserves pollen grains during fossilization.

So the correct option is 'Pollen exine'.

Multiple choice geography hydrologic cycle the atmosphere elements of weather and climate :humidity hydrologic cycle and its components elements of weather and climate : temperature

Plants lose water to the air through _____.

  1. Transpiration

  2. Respiration

  3. Photosynthesis

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

Transpiration is the loss of water from a plant in the form of water vapor. Water is absorbed by roots from the soil and transported as a liquid to the leaves via xylem. In the leaves, small pores allow water to escape as a vapor.

Multiple choice geography hydrologic cycle the atmosphere elements of weather and climate :humidity hydrologic cycle and its components elements of weather and climate : temperature

When living things give off water into the atmosphere through their breathing process, it is called ______.

  1. Transportation

  2. Transpiration

  3. Deposition

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

The process by which moisture is carried through plants from roots to small pores on the underside of leaves, where it changes to vapour and is released to the atmosphere is known as transpiration. 

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

All the following involves osmosis except.

  1. Water from soil entering a root hair

  2. Water passing from root hair to adjacent cells

  3. Water passing up a xylem vessel element to xylem vessel element above it

  4. Water entering a mesophyll cell from xylem vessel element
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Osmosis is the movement of water across a semi-permeable membrane. Water moving up a xylem vessel is primarily driven by transpiration pull and cohesion-tension, not osmosis.

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

When a plant cell is placed in a solution which is hypotonic to the cell sap, which of the following conditions will not apply

  1. The water potential of the cell sap will rise

  2. The suction pressure of the cell sap will fail

  3. The cell will become turgid

  4. The wall pressure of the cell will fail
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

If a cell is placed in hypotonic solution, water start moving into the cell by the process of endosmosis and cell become turgid.

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

All the following involve osmosis except.

  1. Movement of water from soil to root

  2. Movement of water from root hair to endodermis and pericycle

  3. Movement of water between xylem elements

  4. Movement of water form xylem to mesophyll cell of leaves
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Similar to the previous question, movement of water between xylem elements is bulk flow, not osmosis.

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

Consider the following events involved in stomatal opening:
1. Turgor pressure of guard cells increases
2. $K^+$ ions move into guard cells
3. pH of guard cells decreases
4. Water moves into guard cells
What is the correct sequence of these events leading to stomatal opening:

  1. 2-4-3-1

  2. 3-2-4-1

  3. 2-3-4-1

  4. 3-1-2-4
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The sequence is: K+ ions move into guard cells (2), which lowers the water potential, causing water to move in (4), which increases the turgor pressure (1). The pH change (3) is associated with the K+ transport.

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

The movement of a molecule across a typical plant cell about 50mm takes aproximately

  1. 2.5m

  2. 2.5 h

  3. 2.5s

  4. none of these
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Lines of stomates (shown by the orange colour of the guard cells) lie along the flanks describe the status and movement of water in plants, soil and the atmosphere. This internal hydrostatic pressure (also called turgor pressure) is typically 0.5 away from the cell wall, and solution with small molecular weight solutes. 

So, the correct option is "D" (None of these).

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

What happens when wilted vegetable are dipped in water _________________.

  1. They regain their size

  2. Remain to be same

  3. Colour will change

  4. Decrease in size because of lose of water.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

  • After dipping into water wilted vegetable regain their size, as water travells through a network of veins through out the plant and cell are hydrated and refirm their size. by a process called osmosis .
  • Leaves turn yellow or red when they falls , in fallpalnt breakdown and reabsorb chlorophyll, letting the colours of other pigments show through , hence colour changes.
  • When vegitables are wilted due to  dehydration, their size decreases due to loss of water.
 So the correct answer is " They regain their size".