What is the roles of guard cells?

What is the roles of guard cells?
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Answer :

Guard cells in epidermis around stomata pores helps in transpiration through stomata and exchange of gases.
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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.

What is the function of guard cells of stomata? -Science-7

Description : What is the function of guard cells of stomata? -Science-7

Last Answer : Each stoma is surrounded by two guard cells. These guard cells control the opening and closing of stomata.

How do guard cells regulate transpiration? -Biology

Description : How do guard cells regulate transpiration? -Biology

Last Answer : answer:

What do guard cells do in plants? -Biology

Description : What do guard cells do in plants? -Biology

Last Answer : answer:

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.

The kidney shaped guard cells are present in – (1) Dicot plants (2) Monocat plants (3) Both the above (4) Algae

Description : The kidney shaped guard cells are present in – (1) Dicot plants (2) Monocat plants (3) Both the above (4) Algae

Last Answer : (1) Dicot plants Explanation: The guard cells in dicot plants are kidney shaped and dumbbell shaped in monocots. When guard cells expand on the outer edges of the stoma, but not on the inner side ... in kidney-shaped cells, leading to an opening or pore between the two guard cells for gas exchange.

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.

Dumb-bell shaped guard cells are present in – (1) Groundnut (2) Gram (3) Wheat (4) Mango

Description : Dumb-bell shaped guard cells are present in – (1) Groundnut (2) Gram (3) Wheat (4) Mango

Last Answer : (3) Wheat Explanation: Guard cells are dumb-bell shaped in monocots such as wheat. The central portion of the guard cells in wheat is narrow and two ends are bulbous. Guard cells are surrounded by adjacent subsidiary cells.

The exchange of gases takes place in the leaves through these pores for the purpose of photosynthesis. These pores are called – (1) Guard Cells (2) Stomata (3) Chloroplast (4) None of the above

Description : The exchange of gases takes place in the leaves through these pores for the purpose of photosynthesis. These pores are called – (1) Guard Cells (2) Stomata (3) Chloroplast (4) None of the above

Last Answer : (2) Stomata Explanation: Stomata are tiny pores present on the surface of the leaves via which exchange of gases takes place in the leaves for the purpose of photosynthesis. However, exchange of gases also occurs across the surface of stems, roots and leaves as well.

The cells which are closely associated and interacting with guard cells are - (1) Transfusion tissue (2) Complementary cells (3) Subsidiary cells (4) Hypodermal cells

Description : The cells which are closely associated and interacting with guard cells are - (1) Transfusion tissue (2) Complementary cells (3) Subsidiary cells (4) Hypodermal cells

Last Answer : (3) Subsidiary cells Explanation: Guard cells interact physiologically and mechanically with subsidiary cells. Guard cells are those which have chloroplasts and control the opening of stomata. But, subsidiary cells are those which support the guard cells and they do not have chloroplasts.

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.

What does the stomata open? (I) When the guard cells are in flaccid condition (ll) When there is an accumulation of K ions in the guard cells (III) When water enters into the guard cells (IV) When the water potential of guard cells is lower than that of adjacent cells (A) II, III and IV I and IV (B) I and III (C) (D) None

Description : What does the stomata open? (I) When the guard cells are in flaccid condition (ll) When there is an accumulation of K ions in the guard cells (III) When water enters into the guard cells (IV) When the water potential of ... of adjacent cells (A) II, III and IV I and IV (B) I and III (C) (D) None

Last Answer : (A) II, III and IV

The CO2 fixation during C4 pathway occurs in the chloroplast of (a) guard cells (b) bundle sheath cells (c) mesophyll cells (d) spongy parenchyma.

Description : The CO2 fixation during C4 pathway occurs in the chloroplast of (a) guard cells (b) bundle sheath cells (c) mesophyll cells (d) spongy parenchyma.

Last Answer : (c) mesophyll cells

In C4 plants, CO2 fixation is done by (a) sclerenchyma (b) chlorenchyma and hypodermis (c) mesophyll cells (d) guard cells.

Description : In C4 plants, CO2 fixation is done by (a) sclerenchyma (b) chlorenchyma and hypodermis (c) mesophyll cells (d) guard cells.

Last Answer : (c) mesophyll cells

In leaves of C4 plants, malic acid synthesis during CO2 fixation occurs in (a) bundle sheath (b) guard cells (c) epidermal cells (d) mesophyll cells

Description : In leaves of C4 plants, malic acid synthesis during CO2 fixation occurs in (a) bundle sheath (b) guard cells (c) epidermal cells (d) mesophyll cells

Last Answer : (d) mesophyll cells.

Stomata open and close due to (a) circadian rhythm (b) genetic clock (c) pressure of gases inside the leaves (d) turgor pressure of guard cells

Description : Stomata open and close due to (a) circadian rhythm (b) genetic clock (c) pressure of gases inside the leaves (d) turgor pressure of guard cells

Last Answer : (d) turgor pressure of guard cells.

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

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

Last Answer : a) closes completely

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.

Description : 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.

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

Guard cells help in (a) transpiration (b) guttation (c) fighting against infection (d) protection against grazing.

Description : Guard cells help in (a) transpiration (b) guttation (c) fighting against infection (d) protection against grazing.

Last Answer : (a) transpiration

In land plants, the guard cells differ from other epidermal cells in having (a) cytoskeleton (b) mitochondria (c) endoplasmic reticulum (d) chloroplasts.

Description : In land plants, the guard cells differ from other epidermal cells in having (a) cytoskeleton (b) mitochondria (c) endoplasmic reticulum (d) chloroplasts.

Last Answer : (d) chloroplasts.

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

Description : 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) ... microfibrils in the cell wall of guard cells (d) Contraction of outer wall of guard cells

Last Answer : (a) Decrease in turgidity of guard cells

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.

Specialised epidermal cells surrounding the guard cells are called (a) bulliform cells (b) lenticels (c) complementary cells (d) subsidiary cells

Description : Specialised epidermal cells surrounding the guard cells are called (a) bulliform cells (b) lenticels (c) complementary cells (d) subsidiary cells

Last Answer : d) subsidiary cells.

Companion cells are closely associated with (a) sieve elements (b) vessel elements (c) trichomes (d) guard cells.

Description : Companion cells are closely associated with (a) sieve elements (b) vessel elements (c) trichomes (d) guard cells.

Last Answer : a) sieve elements

Companion cells are closely associated with (a) sieve elements (b) vessel elements (c) trichomes (d) guard cells.

Description : Companion cells are closely associated with (a) sieve elements (b) vessel elements (c) trichomes (d) guard cells.

Last Answer : (a) sieve elements

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

Companion cells are closely associated with (1) Guard cells (2) Sieve elements (3) Vessel elements (4) Trichomes

Description : Companion cells are closely associated with (1) Guard cells (2) Sieve elements (3) Vessel elements (4) Trichomes

Last Answer : (2) Sieve elements

Whent the subsidiary or neighboring cells have a common origin with the guard cells such type of stomata ontogeny is called as –

Description : Whent the subsidiary or neighboring cells have a common origin with the guard cells such type of stomata ontogeny is called as –

Last Answer : Whent the subsidiary or neighboring cells have a common origin with the guard cells such type of stomata ontogeny is called as – Mesogenous development

The cells which are colsely associated and interacting with guard cells are (1) Transfusion tissue (2) Complementary cells (3) Subsidiary cells (4) Hypodermal cells

Description : The cells which are colsely associated and interacting with guard cells are (1) Transfusion tissue (2) Complementary cells (3) Subsidiary cells (4) Hypodermal cells

Last Answer : Subsidiary cells

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

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

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Dumb-bell shaped guard cells are present in (1) Groundnut (2) Gram (3) Wheat (4) Mango

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Last Answer : Wheat

The kidney shaped guard cells are present in (1) Dicot plants (2) Monocot plants (3) Both the above (4) Algae

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