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
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
Description : Cork cambium and vascular cambium are (a) parts of secondary xylem and phloem (b) parts of pericycle (c) lateral meristem (d) apical meristem.
Last Answer : (c) lateral meristem
Last Answer : c) lateral meristem
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
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
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.
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.
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
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
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))
Description : Which of the following plants cells with show totipotency ?
Last Answer : Which of the following plants cells with show totipotency ? A. Sieve tubes B. Xylem vessels C. Meristem D. Cork cells
Description : The balloon-shaped structures called tyloses (a) originate in the lumen of vessels (b) characterise the sapwood (c) are extensions of xylem parenchyma cells into vessels (d) are linked to the ascent of sap through xylem vessels.
Last Answer : (c) are extensions of xylem parenchyma cells into vessels
Description : Cellular totipotency is demonstrated by (a) only gymnosperm cells (b) all plant cells (c) all eukaryotic cells (d) only bacterial cells.
Last Answer : (b) all plant cells
Description : Cork is formed from (a) cork cambium (phellogen) (b) vascular cambium (c) phloem (d) xylem.
Last Answer : (a) cork cambium (phellogen)
Description : The common bottle cork is a product of (a) dermatogen (b) phellogen (c) xylem (d) vascular cambium.
Last Answer : (b) phellogen
Description : The common bottle cork is a product of (1) Vascular Cambium (2) Dermatogen (3) Phellogen (4) Xylem
Last Answer : (3) Phellogen
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.
Description : What are sieve tubes?
Last 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.
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
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
Description : $ Cellular totipotency means that single cell can give rise to a fully grown multicellular organisms ! Meristematic cells are also called "stem cells"
Last Answer : $ Cellular totipotency means that single cell can give rise to a fully grown multicellular organisms ! Meristematic ... D. If both As and R are wrong.
Description : Conifers differ from grasses in the (a) formation of endosperm before fertilization (b) production of seeds from ovules (c) lack of xylem tracheids (d) absence of pollen tubes.
Last Answer : (a) formation of endosperm before fertilization
Description : The xylem vessels of plants are part of which tissue ?
Last Answer : The xylem vessels of plants are part of the complex tissue.
Description : What are xylem vessels and tracheids?
Last Answer : Xylem vessels consist of series of elongated dead cells joined together forming end to end tube like structure for conduction of water and salts
Description : A column of water within xylem vessels of tall trees does not break under its weight because of (a) lignification of xylem vessels (b) positive root pressure (c) dissolved sugars in water (d) tensile strength of water.
Last Answer : (d) tensile strength of water.
Description : Vascular bundles in monocotyledons are considered closed because (a) there are no vessels with perforations (b) xylem is surrounded all around by phloem (c) a bundle sheath surrounds each bundle (d) cambium is absent.
Last Answer : (d) cambium is absent.
Description : The chief water conducting elements of xylem in gymnosperms are (a) vessels (b) fibres (c) transfusion tissue (d) tracheids.
Last Answer : (d) tracheids.
Description : The chief water conducting elements of xylem in gymnosperms are (a) vessels (b) fibres (c) transfusion tissue (d) tracheids
Last Answer : d) tracheids.
Description : Wood without xylem vessels are called as
Last Answer : Wood without xylem vessels are called as – Soft wood
Description : Name a gymnosperm with vessels in the Xylem.
Last Answer : Ans: Gnetum.
Description : __________ tubes are good substitute for human blood vessels on heart by-pass operation. (A) PVC (B) Polythene (C) Teflon/Dacron (D) Polystyrene
Last Answer : (C) Teflon/Dacron
Description : The form of growth wherein new cells are always being added to the plant body by the activity of the meristem is called
Last Answer : The form of growth wherein new cells are always being added to the plant body by the activity of the meristem is called
Description : Explain the term totipotency.
Last Answer : Explain the term totipotency.
Description : Define totipotency.
Last Answer : Totipotency is the capacity of a cell to differentiate into a new organism.
Description : Cellular totipotency was demonstrated by (a) Theodore Schwann (b) A.V. Leeuwenhoek (c) F.C. Steward (d) Robert Hooke.
Last Answer : (c) F.C. Steward
Description : In tissue culture medium, the embryoids formed from pollen grains is due to (a) cellular totipotency (b) organogenesis (c) double fertilization (d) test tube culture.
Last Answer : (a) cellular totipotency
Description : The xylem and phloem elements in the plant are surrounded by a layer of living cells called (a) Casparian strips (b) Pericycle (c) Stele(d) Endodermis
Last Answer : (b) Pericycle
Description : part of the dermal tissue that is made of hard, dead, cork cells is the _____. -General Knowledge
Last Answer : Part of the dermal tissue that is made of hard, dead, cork cells is the periderm.
Description : The waxy substance associated with cell walls of cork cells is or cork cells are imprevious to water becauce of the presence or what is deposited on c
Last Answer : The waxy substance associated with cell walls of cork cells is or cork cells are imprevious to water ... . Cutin B. Lignin C. suberin D. Chitin
Description : Abscission layer developed during leaf fall is made of: (a) Cork cells (b) Sclerenchymatous cells (c) Sclerenchymatous cells (d) Parenchymatous cells
Description : Meiosis is best observed in dividing (a) cells of apical meristem (b) cells of lateral meristem (c) microspores and anther wall (d) microsporocytes.
Last Answer : (d) microsporocytes.
Description : A narrow layer of thin walled cells found between phloem/bark and wood of a dicot is (a) cork cambium (b) vascular cambium (c) endodermis (d) pericycle.
Last Answer : (b) vascular cambium
Description : Name the chemical released by cork cells?
Last Answer : Suberin which makes them impervious to gases and water.
Description : Bordered pits are found in (a) sieve cells (b) vessel wall (c) companion cells (d) sieve tube wall.
Last Answer : (b) vessel wall
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.
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.
Description : Companion cells are closely associated with (a) sieve elements (b) vessel elements (c) trichomes (d) guard cells.
Last Answer : a) sieve elements