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 cell structure plant and animal cell cell structure and micro-organisms organisation of the organism

Dye injected into a plant cell might be able to enter an adjacent cell through _______.

  1. microtubule

  2. microfilament

  3. plasmodesmata

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

Plasmodesmata are cytoplasmic bridges between adjacent plant cells which develop in minute pores of their walls. They form protoplasmic continuum called symplast. It provides channels for controlled passage of small sized particles between adjacent cells as well as transfer of some specific signals.

Multiple choice biology cell structure and micro-organisms plant and animal cell cell structure organisation of the organism

The ................. allows high pressure to build inside of the plant cell without bursting.

  1. Cell wall

  2. Cytoplasm

  3. Nucleus

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

The cell wall allows high pressure to build inside of the plant cell without bursting. The plant cell is able to accept large amounts of liquid through osmosis without bursting. This is due to the presence of cell wall which is absent in the animal cell.

Multiple choice botany option b: biotechnology and bioinformatics dna transfer rdna technology - dna transfer and transformation biotechnology in agriculture

Electroporation is

  1. Making transient pores in cell membranes to introduce gene constructs

  2. Fast passage of nutrients through phloem sieve pores by electric stimulation

  3. Opening of stomata by artificial light during night

  4. Purification of saline water with the help of membrane system
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Electroporation is a technique used in molecular biology to create temporary pores in cell membranes using an electrical pulse, allowing foreign DNA or other molecules to enter the cell.

Multiple choice chemistry water in our life how can we conserve water? droughts, floods and water conservation conservation of water and its importance and methods

Why plants die due to water scarcity?

  1. Because plants can not survive without water.

  2. Water transport nutrients to other part of plant.

  3. Water is important to carry different processes in plants.

  4. All of them.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Water is essential for plants because it transports nutrients, maintains structure through turgor pressure, and acts as a medium for metabolic processes like photosynthesis.

Multiple choice biology nutrition and respiration importance of light for photosynthesis various experiments on photosynthesis experiments on photosynthesis - gases

In the experiment " To show that $CO _{2}$ is given out during respiration" the water level in the bent tube rise after sometime because

  1. germinating seeds consume all the $O _{2}$ and $CO _{2}$ in the flask.
  2. the germinating seeds consume $O _{2}$ and give out $CO _{2}$ which is absorbed by a chemical filled in the small test tube.
  3. $CO _{2}$ is given out by the germinating seeds.

  4. seeds need water for germination and grow.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Germinating seeds respire, consuming O2 and releasing CO2. The KOH solution in the small test tube absorbs the CO2, creating a partial vacuum in the flask, which causes the water level in the bent tube to rise.

Multiple choice biology respiration and energy transfer respiratory quotient-basic respiration-plants respiratory quotient

In succulent plants R.Q. is less than one because of

  1. Complete oxidation

  2. Complete reduction

  3. Incomplete reduction

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

In succulent plants, the stomata are open during night and during this time plants absorb carbon dioxide. During day time stomata are closed and no carbon dioxide is evolved. These plants respire during night time, when they can take oxygen through open stomata. The volume of carbon dioxide is less than typical aerobic respiration. In fact during night time, these plants fix carbon dioxide into organic acids. The respiratory substrates are incompletely oxidised and thus, respiratory quotient is less than one.

Multiple choice biology absorption by roots - the processes involved root pressure transportation in plants factors affecting the transport of water and minerals in plants

The cause of guttation is mainly due to

  1. Root pressure

  2. Osmosis

  3. Transpiration pull

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

Guttation is a loss of water from plants in liquid form through hydathodes. The force responsible for guttation is positive root pressure. Guttation is easily observed when transpiration rate is low and soil is well watered.

So, the correct answer is option A.

Multiple choice biology absorption by roots - the processes involved root pressure transportation in plants factors affecting the transport of water and minerals in plants

The pressure exerted on the fluid contents of the cortical cells of root by turgidity, which forces the water into xylem vessels and upward into stem for a certain height is

  1. Imbibition

  2. Root pressure

  3. Capillarity

  4. None of the above
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Root pressure helps to pull the cell sap through a plant stem to the leaves. It occurs in the xylem of some vascular plants when the soil moisture level is high either at night or when transpiration is low during the day.

So, the correct answer is option B.

Multiple choice biology absorption by roots - the processes involved root pressure transportation in plants factors affecting the transport of water and minerals in plants

Root pressure in maximum, when

  1. Transpiration is high and absorption is very low.

  2. Transpiration is very low and absorption is high.

  3. Absorption is very high and transpiration is also very high.

  4. Absorption is very low and transpiration is also low.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

When transpiration is low and soil is generally well watered, a positive root pressure develops. Under the influence of positive root, pressure water oozes out from ends of xylary elements in plants. The main reason for the development of positive root pressure is the active absorption of minerals and water by roots.

So, the correct answer is option B.

Multiple choice biology absorption by roots - the processes involved root pressure transportation in plants factors affecting the transport of water and minerals in plants

Guttation is dependent on

  1. Root pressure

  2. Active absorption

  3. Flaccidity of root cortical cells

  4. High rate of transpiration
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Transpiration is defined as loss of water as gas or vapors from aerial parts, like leaves through the stomatal pore. If there is less of transpiration as due to high atmospheric humidity and the soil is well watered; there will be an increase in root pressure. The increased root pressure leads to oozing out of a solution of minerals from hydathodes (called as guttation) and other openings (called as bleeding). 

So, the correct answer is option A.

Multiple choice biology absorption by roots - the processes involved root pressure transportation in plants factors affecting the transport of water and minerals in plants

Pressure caused by water entering the root from soil is known as

  1. Imbibition

  2. Root pressure

  3. Turgor pressure

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

Root pressure can be defined as the pressure exerted by the cortical cells of the root upon the sap in the xylem vessels which pushes the sap upward if the stem of the plant is cut just above the root water seeps or exudes out of the cut end of the stem for a considerable period of time. This indicates that there is a force pushing water up the stem from the roots.

Multiple choice biology absorption by roots - the processes involved root pressure transportation in plants factors affecting the transport of water and minerals in plants

Root pressure helps in


i Continuous flow of water in plants
ii Pulling force
iii Replacement of lost water

  1. i, ii

  2. ii, iii

  3. i, iii

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

Root pressure provides a force which causes pushing of water in a stem. A continuous flow of water is maintained in the plants because the leaves transpire water through stomata and to replace the lost water the water drawn by the roots moves up.