271543
As tree grow older, which of the following will increase more rapidly in thickness?
1 Heart wood
2 Sap wood
3 Xylem
4 Phloem
Explanation:
Exp:A In old trees, the grater part or secondary xylem is dark brown due to deposition of organic compounds like tannins, resins, oils, gums, aromatic substance and essential oils in the central or innermost layers of the stem. These substance make it hard, durable and resistant to the attacks of micro-organism and insects. This region comprises dead elements with highly lignified walls and is called heart wood. Heartwood is also known as duramen.
BVP-2001
Anatomy of Flowering Plants
271547
Collenchyma occurs in the stem and petioles of
1 xerophytes
2 monocots
3 dicot herbs
4 hybrophytes.
Explanation:
Exp:C Collenchyma occurs in the stem and petioles of dicot herbs. It is found either as a homogeneous or in patches. It consist of cell which are much thickened at the corners due to a deposition of cellulose, is found in epidermis of dicot stem and petioles and abundant in climbing stems.
AIPMT-1990
Anatomy of Flowering Plants
271548
Cork cambium and vascular cambium are
1 parts of secondary xylem and phloem
2 parts of pericycle
3 lateral meristem
4 apical meristem.
Explanation:
Exp:C Vascular cambium and cork cambium are the two lateral meristems. Lateral meristems are located in the stem and roots on the lateral side. It increases thickness of the plants.
AIPMT-1990
Anatomy of Flowering Plants
271549
Sieve tubes are suited for translocation of food because they possess
1 bordered lumen and
2 no end walls
3 broader lumen and perforated cross walls
4 no protoplasm.
Explanation:
Exp:C Sieve tube are suited for translocation of food because they possess broader lumen and perforated cross walls sieve tubes are elongated tubular conducting channels of phloem. The wall possess many small pores and have thin cellulosic wall.
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Anatomy of Flowering Plants
271543
As tree grow older, which of the following will increase more rapidly in thickness?
1 Heart wood
2 Sap wood
3 Xylem
4 Phloem
Explanation:
Exp:A In old trees, the grater part or secondary xylem is dark brown due to deposition of organic compounds like tannins, resins, oils, gums, aromatic substance and essential oils in the central or innermost layers of the stem. These substance make it hard, durable and resistant to the attacks of micro-organism and insects. This region comprises dead elements with highly lignified walls and is called heart wood. Heartwood is also known as duramen.
BVP-2001
Anatomy of Flowering Plants
271547
Collenchyma occurs in the stem and petioles of
1 xerophytes
2 monocots
3 dicot herbs
4 hybrophytes.
Explanation:
Exp:C Collenchyma occurs in the stem and petioles of dicot herbs. It is found either as a homogeneous or in patches. It consist of cell which are much thickened at the corners due to a deposition of cellulose, is found in epidermis of dicot stem and petioles and abundant in climbing stems.
AIPMT-1990
Anatomy of Flowering Plants
271548
Cork cambium and vascular cambium are
1 parts of secondary xylem and phloem
2 parts of pericycle
3 lateral meristem
4 apical meristem.
Explanation:
Exp:C Vascular cambium and cork cambium are the two lateral meristems. Lateral meristems are located in the stem and roots on the lateral side. It increases thickness of the plants.
AIPMT-1990
Anatomy of Flowering Plants
271549
Sieve tubes are suited for translocation of food because they possess
1 bordered lumen and
2 no end walls
3 broader lumen and perforated cross walls
4 no protoplasm.
Explanation:
Exp:C Sieve tube are suited for translocation of food because they possess broader lumen and perforated cross walls sieve tubes are elongated tubular conducting channels of phloem. The wall possess many small pores and have thin cellulosic wall.
271543
As tree grow older, which of the following will increase more rapidly in thickness?
1 Heart wood
2 Sap wood
3 Xylem
4 Phloem
Explanation:
Exp:A In old trees, the grater part or secondary xylem is dark brown due to deposition of organic compounds like tannins, resins, oils, gums, aromatic substance and essential oils in the central or innermost layers of the stem. These substance make it hard, durable and resistant to the attacks of micro-organism and insects. This region comprises dead elements with highly lignified walls and is called heart wood. Heartwood is also known as duramen.
BVP-2001
Anatomy of Flowering Plants
271547
Collenchyma occurs in the stem and petioles of
1 xerophytes
2 monocots
3 dicot herbs
4 hybrophytes.
Explanation:
Exp:C Collenchyma occurs in the stem and petioles of dicot herbs. It is found either as a homogeneous or in patches. It consist of cell which are much thickened at the corners due to a deposition of cellulose, is found in epidermis of dicot stem and petioles and abundant in climbing stems.
AIPMT-1990
Anatomy of Flowering Plants
271548
Cork cambium and vascular cambium are
1 parts of secondary xylem and phloem
2 parts of pericycle
3 lateral meristem
4 apical meristem.
Explanation:
Exp:C Vascular cambium and cork cambium are the two lateral meristems. Lateral meristems are located in the stem and roots on the lateral side. It increases thickness of the plants.
AIPMT-1990
Anatomy of Flowering Plants
271549
Sieve tubes are suited for translocation of food because they possess
1 bordered lumen and
2 no end walls
3 broader lumen and perforated cross walls
4 no protoplasm.
Explanation:
Exp:C Sieve tube are suited for translocation of food because they possess broader lumen and perforated cross walls sieve tubes are elongated tubular conducting channels of phloem. The wall possess many small pores and have thin cellulosic wall.
271543
As tree grow older, which of the following will increase more rapidly in thickness?
1 Heart wood
2 Sap wood
3 Xylem
4 Phloem
Explanation:
Exp:A In old trees, the grater part or secondary xylem is dark brown due to deposition of organic compounds like tannins, resins, oils, gums, aromatic substance and essential oils in the central or innermost layers of the stem. These substance make it hard, durable and resistant to the attacks of micro-organism and insects. This region comprises dead elements with highly lignified walls and is called heart wood. Heartwood is also known as duramen.
BVP-2001
Anatomy of Flowering Plants
271547
Collenchyma occurs in the stem and petioles of
1 xerophytes
2 monocots
3 dicot herbs
4 hybrophytes.
Explanation:
Exp:C Collenchyma occurs in the stem and petioles of dicot herbs. It is found either as a homogeneous or in patches. It consist of cell which are much thickened at the corners due to a deposition of cellulose, is found in epidermis of dicot stem and petioles and abundant in climbing stems.
AIPMT-1990
Anatomy of Flowering Plants
271548
Cork cambium and vascular cambium are
1 parts of secondary xylem and phloem
2 parts of pericycle
3 lateral meristem
4 apical meristem.
Explanation:
Exp:C Vascular cambium and cork cambium are the two lateral meristems. Lateral meristems are located in the stem and roots on the lateral side. It increases thickness of the plants.
AIPMT-1990
Anatomy of Flowering Plants
271549
Sieve tubes are suited for translocation of food because they possess
1 bordered lumen and
2 no end walls
3 broader lumen and perforated cross walls
4 no protoplasm.
Explanation:
Exp:C Sieve tube are suited for translocation of food because they possess broader lumen and perforated cross walls sieve tubes are elongated tubular conducting channels of phloem. The wall possess many small pores and have thin cellulosic wall.