What are sieve tubes?

What are sieve tubes?
by

1 Answer

Answer :

Sieve tubes comprise of longitudinally arranged cells. The cells are joined end to end in a

series. At maturity the cells lose the nucleus.
by

Related questions

Identify the two components of Phloem tissue that help in transportation of food in plants (a) Phloem parenchyma & sieve tubes (b) Sieve tubes & companion cell. (c) Phloem parenchyma & companion cell. (d) Phloem fibres and sieve tubes

Description : Identify the two components of Phloem tissue that help in transportation of food in plants (a) Phloem parenchyma & sieve tubes (b) Sieve tubes & companion cell. (c) Phloem parenchyma & companion cell. (d) Phloem fibres and sieve tubes

Last Answer : (b) Sieve tubes & companion cell.

State the function of a) sieve tubes b) sieve plate c) companion cells d) phloem fibres.

Description : State the function of a) sieve tubes b) sieve plate c) companion cells d) phloem fibres.

Last Answer : a) Sieve tubes: They play an important role in the conduction of food. b) Sieve plate: It allows the food to pass through the pores. c) Companion cells: They control the passage of food through the phloem. d) Phloem fibres: They provide tensile strength to the plant body.

$ Sieve tubes have "P" proteins. ! In gymnosperms, sieve tubes are associated with albuminous cells.

Description : $ Sieve tubes have "P" proteins. ! In gymnosperms, sieve tubes are associated with albuminous cells.

Last Answer : $ Sieve tubes have "P" proteins. ! In gymnosperms, sieve tubes are associated with albuminous cells. A. If ... is wrong D. If both As and R are wrong.

Minerals absorbed by root move to the leaf through (a) xylem (b) phloem (c) sieve tubes (d) none of the above.

Description : Minerals absorbed by root move to the leaf through (a) xylem (b) phloem (c) sieve tubes (d) none of the above.

Last Answer : (a) xylem

Sieve tubes are suited for translocation of food because they possess (a) bordered pits (b) no end walls (c) broader lumen and perforated cross walls (d) no protoplasm

Description : Sieve tubes are suited for translocation of food because they possess (a) bordered pits (b) no end walls (c) broader lumen and perforated cross walls (d) no protoplasm

Last Answer : (c) broader lumen and perforated cross walls

An organised and differentiated cellular structure having cytoplasm but no nucleus is (a) vessels (b) xylem parenchyma (c) sieve tubes (d) tracheids.

Description : An organised and differentiated cellular structure having cytoplasm but no nucleus is (a) vessels (b) xylem parenchyma (c) sieve tubes (d) tracheids.

Last Answer : (c) sieve tubes

Which of the following plant cells will show totipotency? (a) Sieve tubes (b) Xylem vessels (c) Meristem (d) Cork cells

Description : Which of the following plant cells will show totipotency? (a) Sieve tubes (b) Xylem vessels (c) Meristem (d) Cork cells

Last Answer : (c) Meristem

Phloem in gymnosperms lacks (a) both sieve tubes and companion cells (b) albuminous cells and sieve cells (c) sieve tubes only (d) companion cells only.

Description : Phloem in gymnosperms lacks (a) both sieve tubes and companion cells (b) albuminous cells and sieve cells (c) sieve tubes only (d) companion cells only.

Last Answer : (a) both sieve tubes and companion cells

Sieve tubes are suited for translocation of food because they possess (a) bordered pits (b) no end walls (c) broader lumen and perforated cross walls (d) no protoplasm

Description : Sieve tubes are suited for translocation of food because they possess (a) bordered pits (b) no end walls (c) broader lumen and perforated cross walls (d) no protoplasm

Last Answer : (c) broader lumen and perforated cross walls

An organised and differentiated cellular structure having cytoplasm but no nucleus is (a) vessels (b) xylem parenchyma (c) sieve tubes (d) tracheids.

Description : An organised and differentiated cellular structure having cytoplasm but no nucleus is (a) vessels (b) xylem parenchyma (c) sieve tubes (d) tracheids.

Last Answer : (c) sieve tubes

Which of the following plant cells will show totipotency? (a) Sieve tubes (b) Xylem vessels (c) Meristem (d) Cork cells

Description : Which of the following plant cells will show totipotency? (a) Sieve tubes (b) Xylem vessels (c) Meristem (d) Cork cells

Last Answer : (c) Meristem

Phloem in gymnosperms lacks (a) both sieve tubes and companion cells (b) albuminous cells and sieve cells (c) sieve tubes only (d) companion cells only

Description : Phloem in gymnosperms lacks (a) both sieve tubes and companion cells (b) albuminous cells and sieve cells (c) sieve tubes only (d) companion cells only

Last Answer : (a) both sieve tubes and companion cells

What is sieve plate?

Description : What is sieve plate?

Last Answer : Sieve plate is a plate like structure with number of pores is present in between the two cells

What is a sieve area? -Biology

Description : What is a sieve area? -Biology

Last Answer : answer:

What do sieve tube elements do? -Biology

Description : What do sieve tube elements do? -Biology

Last Answer : answer:

What are sieve tube elements? -Biology

Description : What are sieve tube elements? -Biology

Last Answer : answer:

What is the process of purifying water with a sieve ?

Last Answer : The process of purifying water with a sieve is called sieving.

Why is it necessary to sieve the soil samples using 2mm sieve?

Description : Why is it necessary to sieve the soil samples using 2mm sieve?

Last Answer : Need answer

What is the difference between a filter and a sieve?

Description : What is the difference between a filter and a sieve?

Last Answer : filter paper is paper and a sieve is a kitchen utensil used to put objects (pasta,rice) and drain water.filter paper is used to seperate smaller granules (sand etc.) and a sieve is used to seperate larger granules(peas, rice, pasta etc.)

Tyloses are: (a) Lactiferous channels (b) Secretory cells (c) Sieve plates (d) Tracheal plugs plugging the lumen of vessels and tracheids

Description : Tyloses are: (a) Lactiferous channels (b) Secretory cells (c) Sieve plates (d) Tracheal plugs plugging the lumen of vessels and tracheids

Last Answer : Ans. ((d))

200 mesh sieve size corresponds to __________ microns. (A) 24 (B) 74 (C) 154 (D) 200

Description : 200 mesh sieve size corresponds to __________ microns. (A) 24 (B) 74 (C) 154 (D) 200

Last Answer : (B) 74

Which of the following liquid-vapor contacting devices provides maximum contact surface area for a particular duty? (A) Sieve plate column (B) Bubble cap column (C) Randomly packed column (D) Wetted wall column

Description : Which of the following liquid-vapor contacting devices provides maximum contact surface area for a particular duty? (A) Sieve plate column (B) Bubble cap column (C) Randomly packed column (D) Wetted wall column

Last Answer : (D) Wetted wall column

Which of the following same diameter columns gives lowest pressure drop per unit height? (A) Bubble-cap column (B) Sieve-plate column (C) Packed column (stacked)

Description : Which of the following same diameter columns gives lowest pressure drop per unit height? (A) Bubble-cap column (B) Sieve-plate column (C) Packed column (stacked)

Last Answer : (C) Packed column (stacked)

Which of the following equipments is not used for gas dispersion? (A) Agitated vessels (B) Bubble cap tray towers (C) Perforated sieve tray towers (D) Spray towers

Description : Which of the following equipments is not used for gas dispersion? (A) Agitated vessels (B) Bubble cap tray towers (C) Perforated sieve tray towers (D) Spray towers

Last Answer : (D) Spray towers

Hydrogenation of oil is carried out in a/an __________ in Vanaspati manufacturing plant. (A) Agitated vessel (B) Sieve tray column (C) Bubble cap column (D) Packed tower

Description : Hydrogenation of oil is carried out in a/an __________ in Vanaspati manufacturing plant. (A) Agitated vessel (B) Sieve tray column (C) Bubble cap column (D) Packed tower

Last Answer : (A) Agitated vessel

Small dia distillation column can be a (A) Packed column (B) Sieve tray (C) Bubble cap (D) Any of these

Description : Small dia distillation column can be a (A) Packed column (B) Sieve tray (C) Bubble cap (D) Any of these

Last Answer : (A) Packed column

__________ columns are used for liquid dispersion in a continuous gas phase. (A) Packed (B) Pulse (C) Bubble cap (D) Sieve plate

Description : __________ columns are used for liquid dispersion in a continuous gas phase. (A) Packed (B) Pulse (C) Bubble cap (D) Sieve plate

Last Answer : (A) Packed

__________ column is used in gas absorption process. (A) Wetted wall (B) Sieve/perforated tray (C) Bubble cap (D) Packed

Description : __________ column is used in gas absorption process. (A) Wetted wall (B) Sieve/perforated tray (C) Bubble cap (D) Packed

Last Answer : (D) Packed

__________ extractor is used for the concentration of radioactive nuclear waste. (A) Pulsed column (B) Sieve plate (C) Mixer-settler (D) Bollman

Description : __________ extractor is used for the concentration of radioactive nuclear waste. (A) Pulsed column (B) Sieve plate (C) Mixer-settler (D) Bollman

Last Answer : (A) Pulsed column

Pick out the wrong statement. (A) Mechanical agitation is required, if the system has low interfacial tension (B) Sieve tray towers are generally used for systems having low interfacial tension (C) When Henry's law constant is very small, then the mass transfer rate is controlled by the gas film resistance (D) Taylor-Prandtl analogy for heat and mass transfer considers the transfer through both laminar and turbulent layers

Description : Pick out the wrong statement. (A) Mechanical agitation is required, if the system has low interfacial tension (B) Sieve tray towers are generally used for systems having low ... Prandtl analogy for heat and mass transfer considers the transfer through both laminar and turbulent layers

Last Answer : (A) Mechanical agitation is required, if the system has low interfacial tension

Pore size of the molecular sieve 5A is __________ mm. (A) 5 (B) 0.5 (C) 0.05 (D) 50

Description : Pore size of the molecular sieve 5A is __________ mm. (A) 5 (B) 0.5 (C) 0.05 (D) 50

Last Answer : (B) 0.5

The translocation of organic solutes in sieve tube members is supported by (a) cytoplasmic streaming (b) root pressure and transpiration pull (c) P-proteins (d) mass flow involving a carrier and ATP

Description : The translocation of organic solutes in sieve tube members is supported by (a) cytoplasmic streaming (b) root pressure and transpiration pull (c) P-proteins (d) mass flow involving a carrier and ATP

Last Answer : (a) cytoplasmic streaming

The principal pathway of water translocation in angiosperms is (a) sieve cells (b) sieve tube elements (c) xylem vessel system (d) xylem and phloem

Description : The principal pathway of water translocation in angiosperms is (a) sieve cells (b) sieve tube elements (c) xylem vessel system (d) xylem and phloem

Last Answer : a) sieve cells

Which of the following statements regarding mitochondrial membrane is not correct ? (a) The outer membrane resembles a sieve. (b) The outer membrane is permeable to all kinds of molecules. (c) The enzymes of the electron transfer chain are embedded in the outer membrane. (d) The inner membrane is highly convoluted forming a series of infoldings.

Description : Which of the following statements regarding mitochondrial membrane is not correct ? (a) The outer membrane resembles a sieve. (b) The outer membrane is permeable to all kinds of molecules. (c) ... in the outer membrane. (d) The inner membrane is highly convoluted forming a series of infoldings.

Last Answer : (c) The enzymes of the electron transfer chain are embedded in the outer membrane.

Bordered pits are found in (a) sieve cells (b) vessel wall (c) companion cells (d) sieve tube wall.

Description : Bordered pits are found in (a) sieve cells (b) vessel wall (c) companion cells (d) sieve tube wall.

Last Answer : (b) vessel wall

At maturity, which of the following is non-nucleated? (a) Palisade cell (b) Cortical cell (c) Sieve cell (d) Companion cel

Description : At maturity, which of the following is non-nucleated? (a) Palisade cell (b) Cortical cell (c) Sieve cell (d) Companion cel

Last Answer : c) Sieve cell

A common structural feature of vessel elements and sieve tube elements is (a) enucleate condition (b) thick secondary walls (c) pores on lateral walls (d) presence of P-protein

Description : A common structural feature of vessel elements and sieve tube elements is (a) enucleate condition (b) thick secondary walls (c) pores on lateral walls (d) presence of P-protein

Last Answer : (a) enucleate condition

Transport of food material in higher plants takes place through (a) companion cells (b) transfusion tissue (c) tracheids (d) sieve elements.

Description : Transport of food material in higher plants takes place through (a) companion cells (b) transfusion tissue (c) tracheids (d) sieve elements.

Last Answer : (d) sieve elements.

Function of companion cells is (a) providing energy to sieve elements for active transport (b) providing water to phloem (c) loading of sucrose into sieve elements by passive transport (d) loading of sucrose into sieve elements.

Description : Function of companion cells is (a) providing energy to sieve elements for active transport (b) providing water to phloem (c) loading of sucrose into sieve elements by passive transport (d) loading of sucrose into sieve elements.

Last Answer : (d) loading of sucrose into 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

Bordered pits are found in (a) sieve cells (b) vessel wall (c) companion cells (d) sieve tube wall

Description : Bordered pits are found in (a) sieve cells (b) vessel wall (c) companion cells (d) sieve tube wall

Last Answer : (b) vessel wall

At maturity, which of the following is non-nucleated? (a) Palisade cell (b) Cortical cell (c) Sieve cell (d) Companion cel

Description : At maturity, which of the following is non-nucleated? (a) Palisade cell (b) Cortical cell (c) Sieve cell (d) Companion cel

Last Answer : (c) Sieve cell

A common structural feature of vessel elements and sieve tube elements is (a) enucleate condition (b) thick secondary walls (c) pores on lateral walls (d) presence of P-protein.

Description : A common structural feature of vessel elements and sieve tube elements is (a) enucleate condition (b) thick secondary walls (c) pores on lateral walls (d) presence of P-protein.

Last Answer : (a) enucleate condition

Transport of food material in higher plants takes place through (a) companion cells (b) transfusion tissue (c) tracheids (d) sieve elements.

Description : Transport of food material in higher plants takes place through (a) companion cells (b) transfusion tissue (c) tracheids (d) sieve elements.

Last Answer : d) sieve elements.

Function of companion cells is (a) providing energy to sieve elements for active transport (b) providing water to phloem (c) loading of sucrose into sieve elements by passive transport (d) loading of sucrose into sieve elements.

Description : Function of companion cells is (a) providing energy to sieve elements for active transport (b) providing water to phloem (c) loading of sucrose into sieve elements by passive transport (d) loading of sucrose into sieve elements.

Last Answer : (d) loading of sucrose into 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

A soil sample has passing 0.075 mm sieve = 60% liquid limit = 65% and plastic limit = 40%. The group index of the soil, is (A) 5 (B) 20 (C) 40(D) None of these

Description : A soil sample has passing 0.075 mm sieve = 60% liquid limit = 65% and plastic limit = 40%. The group index of the soil, is (A) 5 (B) 20 (C) 40 (D) None of these

Last Answer : (D) None of these

Regeneration of molecular sieve requires it to be heated to a temperature of about __________ °C. (A) 80-120 (B) 200-300 (C) 600-800 (D) 1000-1100

Description : Regeneration of molecular sieve requires it to be heated to a temperature of about __________ °C. (A) 80-120 (B) 200-300 (C) 600-800 (D) 1000-1100

Last Answer : (D) 1000-1100

The group index for a soil, whose liquid limit is 40 percent, plasticity index is 10 percent and percentage passing 75 micron IS sieve (A) 0 (B) 3 (C) 5 (D) 7

Description : The group index for a soil, whose liquid limit is 40 percent, plasticity index is 10 percent and percentage passing 75 micron IS sieve (A) 0 (B) 3 (C) 5 (D) 7

Last Answer : Answer: Option A