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

Plant cells do not burst when kept in isotonic solution due to the presence of _____________.

  1. vacuole

  2. plastids

  3. cell wall

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

Reason: If the medium surrounding the cell has a higher water concentration than of the cell, meaning that the outside solution is very dilute, the cell will gain water by osmosis. Such a solution is known as hypotonic solution. The net result is that water enters the cell. The cell will swell up. Vacuole - are small sized in animal cells while large size in plant cells. The central vacuole of some plant cells may occupy 50 - 90% of the cell volume. In plant cells, vacuoles are full of cell sap (which is made up mostly of water containing various dissolved sugar, salts and other chemicals). Plastids- are present only in plant cells. Plastid containing pigment chlorophyll are known as chloroplasts which are important for photosynthesis in plants. Photosynthesis does not occur in animals. Cell wall - Plant cells are rigid because of presence of cell wall made up of cellulose which is lacking in animal cell. This is the reason why plant cells do not burst and become turgid when placed in hypotonic solution whereas animal cells burst off when placed in hypotonic solution as cell wall is absent in them.Nucleus encloses the chromosome in both plants & animals.

Multiple choice

Root pressure does not occur in

  1. gymnosperms.

  2. angiosperms.

  3. monocots.

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

Root pressure is maintained due to xylem vessels. Gymnosperms lack vessels, thus do not possess root pressure.

Multiple choice

Match the following:

 
a. The process of releasing surplus water into the air by plants 1. Evaporation
b. The process of changing of water into vapours 2. Water cycle
c. The process of changing of water vapours into water 3. Transpiration
d. The process of transfer of water from oceans to atmosphere and back to oceans 4. Condensation

  1. a – 3, b – 1, c – 4, d – 2

  2. a – 3, b – 1, c – 2, d – 4

  3. a – 1, b – 3, c – 4, d – 2

  4. a – 2, b – 1, c – 4, d – 3
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The process of releasing surplus water into the air by plants is called transpiration. The process of changing of water into its vapours is called evaporation, while changing of water vapours into water is called condensation. The journey of water from oceans to atmosphere and back to oceans is called water cycle.

Multiple choice

Match the following ||| |---|---| |a. Condensation|1. It is the process through which the plants release the surplus water into the air through their leaves.| |b. Precipitation|2. It is the falling of water drops from the clouds.| |c. Transpiration|3. It is the change of gaseous form of water into the liquid state on cooling.|

  1. a – 3, b – 2, c – 1

  2. a – 3, b – 1, c – 2

  3. a – 2, b – 3, c – 1

  4. a – 1, b – 2, c – 3

  5. a – 1, b – 3, c – 2
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

This is the correct option. Condensation is the change of gaseous form of water into the liquid state on cooling. Precipitation is the falling of water drops from the clouds. Transpiration is the process through which the plants release the surplus water into the air through their leaves.

Multiple choice

Which of the following structures does not help in the gaseous exchange in plants?

  1. Stomata

  2. Lenticels

  3. Petiole

  4. General Surface of the Roots

Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

A petiole is the stalk or stem that connects the leaf to the plant It is usually attached to the shoot at the node, subtending (attached beneath) the lateral meristem (axillary bud). On a compound leaf, the petiole extends from the stem to the first set of leaflets.It does not helps in the gaseous exchange 

Multiple choice

More dew is formed on grass than on a metallic utensil because

  1. there is transpiration in plants

  2. grass attracts dew drops on account of photosynthesis

  3. grass being good radiator, enables water vapour in the air to condense on it

  4. grass is a good conductor
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Grass is a good radiator of heat, meaning it loses heat quickly at night. This causes its temperature to drop below the dew point of the surrounding air, leading to condensation, whereas metals are generally poor radiators.