Tag: water absorption and ascent of sap in plants

Questions Related to water absorption and ascent of sap in plants

Which of the following statements are not true?

biology water absorption and ascent of sap in plants transport of water across plants habit of plants plant classifications

  1. In CAM plants, stomata open during dark and remain closed during the day

  2. Role of $Na^+$ in stomatal opening is now universally accepted

  3. Water potential of root cells is higher than water potential of soil

  4. Capillarity theory is most accepted theory of water movement through plants

  5. Wall of xylem vessels made up of lignocellulose has strong affinity for water molecules

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Correct Option: A

A plant that trails prostrately on ground is ____________.

biology water absorption and ascent of sap in plants transport of water across plants habit of plants plant classifications

  1. Smilax

  2. Portulaca

  3. Pothos

  4. None of these

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Correct Option: A

Phytotron in meant for

biology water absorption and ascent of sap in plants transport of water across plants habit of plants plant classifications

  1. Controlled irradiation

  2. Induction of mutations

  3. Controlled humidity

  4. Growing plants under controlled environment

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Correct Option: D

A secondary compounds is not a part of the plants

biology water absorption and ascent of sap in plants transport of water across plants habit of plants plant classifications

  1. Defense against herbivores

  2. Normal metabolism

  3. Evolution

  4. embryology

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Correct Option: A
Explanation:

Secondary compounds are complex chemicals made by plants that are not essential to the life of the plant. They are thought to be produced primarily as pesticides and anti-grazing agents, but they also used as pigments, hormones and chemical agents that can attack other plants.

So, the correct option is 'Defense against herbivores'.

Ascent of sap is best explained by.

botany water absorption and ascent of sap in plants factors affecting the transport of water and minerals in plants ascent of sap long distance transport of water

  1. Mass (bulk) flow

  2. Pulsation theory

  3. Root pressure

  4. Cohesion-tension transpiration pull

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Correct Option: D
Explanation:

The cohesion-tension theory is a theory of intermolecular attraction that explains the process of water flow upwards (against the force of gravity) through the xylem of plants. Transpiration pull, utilizing capillary action and the inherent surface tension of water, is the primary mechanism of water movement in plants.
Answer is D.

the major driving force in the movement of water in the xylem is 

botany water absorption and ascent of sap in plants factors affecting the transport of water and minerals in plants ascent of sap long distance transport of water

  1. Osmotic pressure

  2. gravitational pull

  3. transpiration pull

  4. Diffussion pressure

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Correct Option: C
Explanation:
The movement of water in the xylem is explained by the cohesion-tension theory. According to this theory, the water moves up in the xylem via the force of transpiration which is created because of the evaporation of water from the leaves of the plant.

So, the correct answer is 'transpiration pull'.

Read the following statements regarding transaction and select the correct option
I. Transpiration is the loss liquid droplets from the plant
II. Low atmospheric pressure inhibits transpiration
III. Transpiration maintains the shape and structure of plant parts
IV. Cuticular transpiration takes place only during day time

botany water absorption and ascent of sap in plants factors affecting the transport of water and minerals in plants ascent of sap long distance transport of water

  1. I &II only

  2. I, II &III only

  3. III only

  4. None of the statements are true

Show answer
Correct Option: D
Explanation:
  • The process of loss of water from the aerial part of the plant in the form of vapor is known as transpiration.
  • It is of three types:-
(i) Cuticle transpiration (loss of water from cuticles),
(ii)Lenticular transpiration (loss of water from lenticels)
(iii)Stomatal transpiration (loss of water from stomata)
  •  Atmospheric pressure, humidity, and temperature are some factor that affects transpiration.
So, the correct option is 'None of the statements are true'.

Which of the following sequence is completely cryptoanalysed?

botany water absorption and ascent of sap in plants factors affecting the transport of water and minerals in plants ascent of sap long distance transport of water

  1. AUG UCG GAG UAA UUU UGA

  2. AUG UUG UGG GAG UCA UAG

  3. GUG UCG UGA AAG UAU UGA

  4. AUG AAU GCU GUT UAC UAA

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Correct Option: D
Explanation:

The sequence that can be cryptoanalyzed/ all the codons code for proteins will be devoid of any stop codons. 

Since all the other sequences except AUG AAU GCU GUT UAC UAA can code for proteins without intermediate termination, it can be completely cryptoanalyzed.
So, the correct option is 'AUG AAU GCU GUT UAC UAA'.

Read the following statements and identify the incorrect difference between transpiration pull and root pressure.

Transpiration pull Root pressure
$(1)$ Acts as main driving force for translocation of water in tall trees It establishes chain of water molecules in xylem of tall trees
$(2)$ Its magnitude is maximum during day time Its magnitude is maximum during early morning and night
$(3)$ It generates a strong positive water potential in xylem It is a negative hydrostatic pressure developed in xylem
$(4)$ It is manifestation of passive water absorption It generates from active water absorption
botany water absorption and ascent of sap in plants factors affecting the transport of water and minerals in plants ascent of sap long distance transport of water

  1. $1$

  2. $2$

  3. $3$

  4. $4$

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Correct Option: A

A pressure that is responsible for pushing up water to small height in the stem is?

botany water absorption and ascent of sap in plants factors affecting the transport of water and minerals in plants ascent of sap long distance transport of water

  1. Positive root pressure

  2. Turgor pressure

  3. Pressure gradient

  4. Negative root pressure

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Correct Option: A