Tag: excretion in plants

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Questions Related to excretion in plants

Multiple choice biology life processes guttation excretion in plants long distance transport of water

Resin canals in Pinus are formed.

  1. By the separation of secretory cells

  2. By the destruction of secretory cells

  3. Partly by separation and partly by destruction of secretary cells

  4. By large intercellular spaces of the cortex of the stem
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Resin canals in Pinus are lysigenous or schizogenous in origin, but in the context of botanical anatomy, they are typically described as being formed by the separation of secretory cells (schizogenous).

Multiple choice botany transpiration guttation excretion in plants long distance transport of water

Which one of the following is not related to guttation?

  1. Water is given out in the form of droplets

  2. Water given out is impure

  3. Water is given out during daytime

  4. Guttation is of universal occurance
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

In soil rich in moisture content water floods a plant root system. Leaves can retain only a finite amount of water. Excess water i.e xylem sap from the roots is given out through pores or edge of leaves in the form of droplets. This process is called guttation. As this water contains different organic and inorganic substances from the plant it is considered impure. Also, guttation is of universal occurrence. Thus the correct answer is option C.

Multiple choice botany transpiration guttation excretion in plants long distance transport of water

Which condition favors guttation?

  1. High humidity

  2. Low humidity

  3. More transpiration

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

Guttation is the phenomenon of the release of small water droplets from the pores of the plants. It is done in order to release the extra water out of the plant in very humid conditions. It is commonly seen in mesophytes.

During the absence of sunlight stomata are closed so there is minimal transpiration. Hence there is a need for guttation.
So the correct answer is 'High humidity'.

Multiple choice botany transpiration guttation excretion in plants long distance transport of water

Loss of water from tips of leaves is 

  1. Transpiration

  2. Guttation

  3. Bleeding

  4. Respiration
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
Guttation is the process of loss of impure water from plant infact, mostly from margins of leaves. It occurs when transpiration rate is very low as compared to rate of water absorption. Due to this root pressure is developed and water is pushed out through specialized pores at vein endings called hydathodes. 
So, the correct answer is option B.
Multiple choice botany transpiration guttation excretion in plants long distance transport of water

Guttation occurs through

  1. Stomata

  2. Lenticels

  3. Cuticle

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

Hydathodes release water in the form of small water droplets and hence are responsible for guttation.

Stomata causes Transpiration and exchange of gases.
Lenticels cause exchange of gases.
Cuticle is the protective covering.
So the correct answer is 'Hydathodes'.

Multiple choice botany transpiration guttation excretion in plants long distance transport of water

Guttation is found in

  1. Mirabilis

  2. Colocoasio

  3. Mango

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

Guttation is not to be confused with dew, which condenses from the atmosphere onto the plant surface. At night, transpiration usually does not occur because most plants have their stomata (pores found in the epidermis of leaves, stems and other organs that are used to control gas exchange)closed. So the correct option is ' Mirabilis’.

Multiple choice botany transpiration guttation excretion in plants long distance transport of water

Exudation of xylem sap on cutting of a shoot is due to

  1. Guttation

  2. Root pressure

  3. Transpiration

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

When a well-watered shoot is cut near the base, xylem sap often exudes out due to positive hydrostatic pressure built up in the roots, known as root pressure. Guttation involves the loss of liquid water through hydathodes, and transpiration creates negative pressure (tension), not positive exudation.

Multiple choice botany transpiration guttation excretion in plants long distance transport of water

State whether the following statement is true or false. If false rewrite the correct form of the statement by changing the last word.
Exudation of sap from the injured parts of a plant is called guttation.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The statement is correct; the exudation of sap from injured parts is indeed referred to as guttation in many biological contexts.

Multiple choice botany transpiration guttation excretion in plants long distance transport of water

Water drops present on leaf margins of Tropaeolum, balsam and grasses in early morning are due to

  1. Guttation

  2. Dew

  3. Osmosis

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

Guttation is the loss of water in liquid form through hydathodes. Guttation is usually seen under environmental conditions when transpiration is low and soil is well watered. It occurs under the influence of positive root pressure. Water droplets present on leaf margins of some plants in the early morning is not due drops but the water that has oozed out from xylem tracheids.