Which of the following facilitates opening of stomatal aperture? (a) Decrease in turgidity of guard cells (b) Radial orientation of cellulose microfibrils in the cell wall of guard cells (c) Longitudinal orientation of cellulose microfibrils in the cell wall of guard cells (d) Contraction of outer wall of guard cells

Which of the following facilitates opening of
stomatal aperture?
(a) Decrease in turgidity of guard cells
(b) Radial orientation of cellulose microfibrils in
the cell wall of guard cells
(c) Longitudinal orientation of cellulose microfibrils
in the cell wall of guard cells
(d) Contraction of outer wall of guard cells
by

1 Answer

Answer :

(a) Decrease in turgidity of guard cells
by

Related questions

Which of the following facilitates opening of stomatal aperture ? (1) Decrease in turgidity of guard cells (2) Radial orientation of cellulose microfibrils in the cell wall of guard cells (3) Longitudinal orientation of cellulose microfibrils in the cell wall of guard cells (4) Contraction of outer wall of guard cells

Description : Which of the following facilitates opening of stomatal aperture ? (1) Decrease in turgidity of guard cells (2) Radial orientation of cellulose microfibrils in the cell wall of guard cells (3) Longitudinal ... microfibrils in the cell wall of guard cells (4) Contraction of outer wall of guard cells

Last Answer : (2) Radial orientation of cellulose microfibrils in the cell wall of guard cells

Stomatal opening is based on (1) Exosrnosis (2) Endosmosis (3) Plasmolysis in guard cells (4) Decrease in concentration of cell sap

Description : Stomatal opening is based on (1) Exosrnosis (2) Endosmosis (3) Plasmolysis in guard cells (4) Decrease in concentration of cell sap

Last Answer : (2) Endosmosis Explanation: According to the K+ ion theory the guard cells absorb K+ ions from the cells around them as they produce ATP (due to photosynthesis) and become ... guard cells become turgid and the stomata opens. Decreasing light intensity and photosynthesis causes Stomatal closing.

Stomatal opening is based on (1) Exosmosis (2) Endosmosis (3) Plasmolysis in guard cells (4) Decrease in concentration of cell sap

Description : Stomatal opening is based on (1) Exosmosis (2) Endosmosis (3) Plasmolysis in guard cells (4) Decrease in concentration of cell sap

Last Answer : Endosmosis

Given below is the diagram of a stomatal apparatus. In which of the following all the four parts labelled as A, B, C and D are correctly identified? A B C D A B C D (a) Subsidiary Epidermal Guard cell Stomatal cell cell aperture (b) Guard cell Stomatal Subsidiary Epidermal aperture cell cell (c) Epidermal Guard cell Stomatal Subsidiary cell cell aperture (d) Epidermal Subsidiary Stomatal Guard cell cell cell aperture

Description : Given below is the diagram of a stomatal apparatus. In which of the following all the four parts labelled as A, B, C and D are correctly identified? A B C D A B C D ... ) Epidermal Guard cell Stomatal Subsidiary cell cell aperture (d) Epidermal Subsidiary Stomatal Guard cell cell cell aperture

Last Answer : d) Epidermal Subsidiary Stomatal Guard cell cell cell aperture

How do guard cells regulate opening and closing of stomatal pores ? -Science

Description : How do guard cells regulate opening and closing of stomatal pores ? -Science

Last Answer : The opening and closing of stomatal pores is controlled by the guard cells, when water flows into the guard cells, they swell, become curved and cause the pore to open whereas when the guard cells lose water, they shrink, become straight and close the stomatal pore

(a) Draw a diagram to show open stomatal pore and label on it: (i) guard cells (ii) chloroplast (b) State two functions of stomata. (c) How do guard cells regulate the opening and closing of stomatal pore? -Biology

Description : (a) Draw a diagram to show open stomatal pore and label on it: (i) guard cells (ii) chloroplast (b) State two functions of stomata. (c) How do guard cells regulate the opening and closing of stomatal pore? -Biology

Last Answer : (a) (b) Two functions of stomata are: (i) Exchange of gases between the plant and the atmosphere takes place through stomata. (ii)Transpiration in plants takes place through stomata. ( ... through these stomata, the plant closes these pores when it does not require carbon dioxide for photosynthesis.

The opening and closing of the stomatal pores is a function of the - (1) Guard cells (2) Chloroplast (3) Xylem (4) Phloem

Description : The opening and closing of the stomatal pores is a function of the - (1) Guard cells (2) Chloroplast (3) Xylem (4) Phloem

Last Answer : (1) Guard cells Explanation: The opening and closing of the pores is a function of the guard cells. They swell when water flows into them, causing the stomatal pore to open and likewise, the pore closes if the guard cells shrink.

Which of the following statements is not true for stomatal apparatus? (a) Guard cells invariably possess chloroplasts and mitochondria. (b) Guard cells are always surrounded by subsidiary cells. (c) Stomata are involved in gaseous exchange. (d) Inner wall of guard cells are thick

Description : Which of the following statements is not true for stomatal apparatus? (a) Guard cells invariably possess chloroplasts and mitochondria. (b) Guard cells are always surrounded by subsidiary cells. (c) Stomata are involved in gaseous exchange. (d) Inner wall of guard cells are thick

Last Answer : (b) Guard cells are always surrounded by subsidiary cells.

The special modified epiderniai cells surrounding stomatal pore are called - (1) Epithelial cells (2) Guard cells (3) Subsidiary cells (4) Accessory cells

Description : The special modified epiderniai cells surrounding stomatal pore are called - (1) Epithelial cells (2) Guard cells (3) Subsidiary cells (4) Accessory cells

Last Answer : (2) Guard cells Explanation: The pore is bordered by a pair of specialized parenchyma cells known as guard cells that are responsible for regulating the size of the opening. Guard cells are specialized cells in the epidermis of leaves, stems and other organs that are used to control gas exchange.

In guard cells when sugar is converted into starch, the stomatal pore (a) closes completely (b) opens partially (c) opens fully (d) remains unchanged.

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Last Answer : a) closes completely

The special modified epidermal cells surrounding stomatal pore are called (1) Epithelial cells (2) Guard cells (3) Subsidiary cells (4) Accessory cells

Description : The special modified epidermal cells surrounding stomatal pore are called (1) Epithelial cells (2) Guard cells (3) Subsidiary cells (4) Accessory cells

Last Answer : Guard cells

Which one gives the most valid and recent explanation for stomatal movement? (a) Starch hydrolysis (b) Guard cell photosynthesis (c) Transpiration (d) Potassium influx and efflux

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Last Answer : (d) Potassium influx and efflux

Which one of the following pairs, is not correctly matched? (a) Gibberellic acid - Leaf fall (b) Cytokinin - Cell division (c) IAA - Cell wall elongation (d) Abscissic acid - Stomatal closure

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Explain the mechanism of stomatal opening and closing. -Biology

Description : Explain the mechanism of stomatal opening and closing. -Biology

Last Answer : answer:

Water vapour comes out from the plant leaf through the stomatal opening. Through the same stomatal opening carbon dioxide diffuses into the plant duri

Description : Water vapour comes out from the plant leaf through the stomatal opening. Through the same stomatal opening carbon dioxide diffuses into the plant duri

Last Answer : Water vapour comes out from the plant leaf through the stomatal opening. Through the same stomatal ... durign day time, and the other at night.

Which of the following statements are true? 1. Cytokinins promote stomatal opening 2. Sprays of indole -3 acetic acid can inhibit premature fruit fall 3. The growth movements caused by a unilateral stimulus are known as nastic movements 4. The seeds of desert plants will not germinate unless they have been subjected to a high temperature for some time Questions Select the correct answer from the following: (a) 1, 2, and 4 (b) 2 and 4 (c) 1, 2, and 4 (d) 1, 2, 3, and 4

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Last Answer : Ans:(a)

Conversion of starch to sugar is essential for - (1) Stomatal opening (2) Stomatal closing (3) Stomatal formation (4) Stomatal growth

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Last Answer : (1) Stomatal opening Explanation: For keeping the stomata open a constant expenditure of energy is required. This is provided by the conversion of starch to sugar. The stomata! opening is, in turn ... at the leaves while their stomata are open for the passage of CO2 and 02 during photosynthesis.

Conversion of starch to organic acids is required for (a) stomatal opening (b) stomatal closing (c) stomatal formation (d) stomatal activity.

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Water vapour comes out from the plant leaf through the stomatal opening. Through the samestomatal opening carbon dioxide diffuses into the plant during photosynthesis. Reason out the above statements using one of following options. (a) The above processes happen only during night time. (b) One process occurs during day time and the other at night. (c) Both processes cannot happen simultaneously. (d) Both processes can happen together because the diffusion coefficient of water and CO2 is different

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Opening and closing of stomata is due to the (a) hormonal change in guard cells (b) change in turgor pressure of guard cells (c) gaseous exchange (d) respiration.

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Last Answer : (b) change in turgor pressure of guard cells

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Cytoskeleton is made up of (a) callose deposits (b) cellulosic microfibrils (c) proteinaceous filaments (d) calcium carbonate granules.

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Disc compensators are provided in large diameter fuel gas carrying pipelines to (A) Keep the pipe in proper orientation (B) Make the pipe joint leak-proof (C) Account for contraction/expansion of pipe due to temperature changes of the surroundings (D) Account for the pressure variation side the pipeline

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A_______ bearing supports the load acting along the axis of the shaft. a) Thrust b) Radial c) Longitudinal d) Transversal

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Differentiate between haemolysis and turgidity. -Biology

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Last Answer : answer:

Differentiate between haemolysis and turgidity. -Biology

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$ Exosmosis causes turgidity. ! Endomosis causes flaccidity.

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The outer skin most of the crustaceans are made up of a carbohydrate. This carbohydrate is (1) cellulose (2) galactose (3) chitin (4) starch

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The number of modes propagated in a multimode fiber depends on core size and numerical aperture (NA). If the core size and the NA decrease, will the number of modes propagated increase or decrease?

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In a thick cylindrical shell subjected to an internal pressure (p), the radial stress across the thickness of a cylinder is a) maximum at the outer surface and minimum at the inner surface b) maximum at the inner surface and minimum at the outer surface c) maximum at the inner surface and zero at the outer surface d) maximum at the outer surface and zero at the inner surface

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$ Cell wall of plants is formed of fungal cellulose. ! Smooth endoplasmic reticulum has ribosomes on its flagellin.

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One of the major components of cell wall of most fungi is (a) cellulose (b) hemicellulose (c) chitin (d) peptidoglycan.

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Cellulose is the chief constituent of (1) cell wall (2) cell membrane (3) secondary wall of xylem (4) body wall of insects

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Which cells secretes wax located at the outer surface of body wall ?

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