271557
Which of the following cells is not totipotent?
1 Pith cell
2 Epidermal cell
3 Sieve cell
4 Pollen grain
Explanation:
Exp:C Sieve cell is not totipotent because sieve cell have a large central vacuole with thin peripheral protoplasm. - Totipotent cell have the ability of regeneration. - Sieve cell : - Sieve cells are long, conducting cells with narrow diameter that do with albuminous cells that helps in the transportation of organic materials. Sieves cells are single cells. The sieves pores are present on both lateral and walls.
JIPMER-2002
Anatomy of Flowering Plants
271560
Tyloses are the structures found in xylem vessels:
1 help in efficient flow of water
2 help in efficient flow of nutrients
3 function is neutral
4 all the time hinders the flow of water
Explanation:
Exp:D Tyloses are the balloon like structure which are developed by the adjacent xylem parenchyma and ray parenchyma cells and block the lumen of vessels. - Tyloses are commonly found in many angiospermic families normally they develop into heart wood to give extra mechanical support.
Karnataka CET-2000
Anatomy of Flowering Plants
271561
Aerenchyma is present in which of the following plants ? (1) Neptunia (2) potamogeton (3) Bryophyllum (4) Vallisneria
1 1,2 and 3 are correct
2 1 and 2 are correct
3 2 and 4 are correct
4 1 and 3 are correct
Explanation:
Exp:C Aerenchyma is present in potamogeton and vallisneria. Aerenchyma helps in buoyancy. It is well developed in hydrophytes. Aerenchyma is a modified parenchyma, tissue containing air chambers between cells. These cells facilitate the diffusion of gasses between the plants and its surroundings and provide buoyancy to aquatic plants.
BHU PMT (Mains)-2007
Anatomy of Flowering Plants
271564
Sieve tube is :
1 without nucleus
2 multinucleate
3 uninucleate
4 none of these
Explanation:
Exp:A Sieve tubes are considered living cells without a nucleus because the nucleus of companion cells controls their functional activities. Companion cells which unite with sieve tubes to form the sieve element-companion cell complex are related to sieve tube members. Note - The cell nucleus is a prominent structure that is responsible for undertaking several processes such as transcription and replication. The nucleus is considered as the controlling center of the cells . It's present mostly in all eukaryotic except a few. In plant cells, the nucleus is absent in the sieve tubes. Sieve tubes cells are conducting cells of the phloem and do not contain nucleus and ribosome.
271557
Which of the following cells is not totipotent?
1 Pith cell
2 Epidermal cell
3 Sieve cell
4 Pollen grain
Explanation:
Exp:C Sieve cell is not totipotent because sieve cell have a large central vacuole with thin peripheral protoplasm. - Totipotent cell have the ability of regeneration. - Sieve cell : - Sieve cells are long, conducting cells with narrow diameter that do with albuminous cells that helps in the transportation of organic materials. Sieves cells are single cells. The sieves pores are present on both lateral and walls.
JIPMER-2002
Anatomy of Flowering Plants
271560
Tyloses are the structures found in xylem vessels:
1 help in efficient flow of water
2 help in efficient flow of nutrients
3 function is neutral
4 all the time hinders the flow of water
Explanation:
Exp:D Tyloses are the balloon like structure which are developed by the adjacent xylem parenchyma and ray parenchyma cells and block the lumen of vessels. - Tyloses are commonly found in many angiospermic families normally they develop into heart wood to give extra mechanical support.
Karnataka CET-2000
Anatomy of Flowering Plants
271561
Aerenchyma is present in which of the following plants ? (1) Neptunia (2) potamogeton (3) Bryophyllum (4) Vallisneria
1 1,2 and 3 are correct
2 1 and 2 are correct
3 2 and 4 are correct
4 1 and 3 are correct
Explanation:
Exp:C Aerenchyma is present in potamogeton and vallisneria. Aerenchyma helps in buoyancy. It is well developed in hydrophytes. Aerenchyma is a modified parenchyma, tissue containing air chambers between cells. These cells facilitate the diffusion of gasses between the plants and its surroundings and provide buoyancy to aquatic plants.
BHU PMT (Mains)-2007
Anatomy of Flowering Plants
271564
Sieve tube is :
1 without nucleus
2 multinucleate
3 uninucleate
4 none of these
Explanation:
Exp:A Sieve tubes are considered living cells without a nucleus because the nucleus of companion cells controls their functional activities. Companion cells which unite with sieve tubes to form the sieve element-companion cell complex are related to sieve tube members. Note - The cell nucleus is a prominent structure that is responsible for undertaking several processes such as transcription and replication. The nucleus is considered as the controlling center of the cells . It's present mostly in all eukaryotic except a few. In plant cells, the nucleus is absent in the sieve tubes. Sieve tubes cells are conducting cells of the phloem and do not contain nucleus and ribosome.
271557
Which of the following cells is not totipotent?
1 Pith cell
2 Epidermal cell
3 Sieve cell
4 Pollen grain
Explanation:
Exp:C Sieve cell is not totipotent because sieve cell have a large central vacuole with thin peripheral protoplasm. - Totipotent cell have the ability of regeneration. - Sieve cell : - Sieve cells are long, conducting cells with narrow diameter that do with albuminous cells that helps in the transportation of organic materials. Sieves cells are single cells. The sieves pores are present on both lateral and walls.
JIPMER-2002
Anatomy of Flowering Plants
271560
Tyloses are the structures found in xylem vessels:
1 help in efficient flow of water
2 help in efficient flow of nutrients
3 function is neutral
4 all the time hinders the flow of water
Explanation:
Exp:D Tyloses are the balloon like structure which are developed by the adjacent xylem parenchyma and ray parenchyma cells and block the lumen of vessels. - Tyloses are commonly found in many angiospermic families normally they develop into heart wood to give extra mechanical support.
Karnataka CET-2000
Anatomy of Flowering Plants
271561
Aerenchyma is present in which of the following plants ? (1) Neptunia (2) potamogeton (3) Bryophyllum (4) Vallisneria
1 1,2 and 3 are correct
2 1 and 2 are correct
3 2 and 4 are correct
4 1 and 3 are correct
Explanation:
Exp:C Aerenchyma is present in potamogeton and vallisneria. Aerenchyma helps in buoyancy. It is well developed in hydrophytes. Aerenchyma is a modified parenchyma, tissue containing air chambers between cells. These cells facilitate the diffusion of gasses between the plants and its surroundings and provide buoyancy to aquatic plants.
BHU PMT (Mains)-2007
Anatomy of Flowering Plants
271564
Sieve tube is :
1 without nucleus
2 multinucleate
3 uninucleate
4 none of these
Explanation:
Exp:A Sieve tubes are considered living cells without a nucleus because the nucleus of companion cells controls their functional activities. Companion cells which unite with sieve tubes to form the sieve element-companion cell complex are related to sieve tube members. Note - The cell nucleus is a prominent structure that is responsible for undertaking several processes such as transcription and replication. The nucleus is considered as the controlling center of the cells . It's present mostly in all eukaryotic except a few. In plant cells, the nucleus is absent in the sieve tubes. Sieve tubes cells are conducting cells of the phloem and do not contain nucleus and ribosome.
271557
Which of the following cells is not totipotent?
1 Pith cell
2 Epidermal cell
3 Sieve cell
4 Pollen grain
Explanation:
Exp:C Sieve cell is not totipotent because sieve cell have a large central vacuole with thin peripheral protoplasm. - Totipotent cell have the ability of regeneration. - Sieve cell : - Sieve cells are long, conducting cells with narrow diameter that do with albuminous cells that helps in the transportation of organic materials. Sieves cells are single cells. The sieves pores are present on both lateral and walls.
JIPMER-2002
Anatomy of Flowering Plants
271560
Tyloses are the structures found in xylem vessels:
1 help in efficient flow of water
2 help in efficient flow of nutrients
3 function is neutral
4 all the time hinders the flow of water
Explanation:
Exp:D Tyloses are the balloon like structure which are developed by the adjacent xylem parenchyma and ray parenchyma cells and block the lumen of vessels. - Tyloses are commonly found in many angiospermic families normally they develop into heart wood to give extra mechanical support.
Karnataka CET-2000
Anatomy of Flowering Plants
271561
Aerenchyma is present in which of the following plants ? (1) Neptunia (2) potamogeton (3) Bryophyllum (4) Vallisneria
1 1,2 and 3 are correct
2 1 and 2 are correct
3 2 and 4 are correct
4 1 and 3 are correct
Explanation:
Exp:C Aerenchyma is present in potamogeton and vallisneria. Aerenchyma helps in buoyancy. It is well developed in hydrophytes. Aerenchyma is a modified parenchyma, tissue containing air chambers between cells. These cells facilitate the diffusion of gasses between the plants and its surroundings and provide buoyancy to aquatic plants.
BHU PMT (Mains)-2007
Anatomy of Flowering Plants
271564
Sieve tube is :
1 without nucleus
2 multinucleate
3 uninucleate
4 none of these
Explanation:
Exp:A Sieve tubes are considered living cells without a nucleus because the nucleus of companion cells controls their functional activities. Companion cells which unite with sieve tubes to form the sieve element-companion cell complex are related to sieve tube members. Note - The cell nucleus is a prominent structure that is responsible for undertaking several processes such as transcription and replication. The nucleus is considered as the controlling center of the cells . It's present mostly in all eukaryotic except a few. In plant cells, the nucleus is absent in the sieve tubes. Sieve tubes cells are conducting cells of the phloem and do not contain nucleus and ribosome.
