271668
Vascular bundles in monocotyledons are considered closed because:
1 Cambium is absent
2 There are no vessels with perforations
3 Xylem is surrounded all around by phloem
4 A bundle sheath surrounds each bundle
Explanation:
Exp:A Vascular bundles in monocotyledons are considered as closed because cambium is absent in the vascular system and thus they lack secondary growth in the thickness. - The xylem and phloem are the two vascular tissues found in plants. Xylem is specialized tissue that involves in the water transportation and movement of nutrients from root to tip of the leaves of a plant. The xylem is present in the inner surface and phloem in the outer surface and cambium is not present in monocot plants.
AIPMT-2015
Anatomy of Flowering Plants
271670
You are given a fairly old piece of dicot stem and a dicot root. Which of the following anatomical structures will you use to distinguish between the two?
1 Secondary xylem
2 Secondary phloem
3 Protoxylem
4 Cortical cells
Explanation:
Exp:C Protoxylem develops during the primary growth of a plant. In stems the protoxylem lies towards the centre (pith) and the metaxylem lies towards the periphery. This type of primary xylem is called endarch. In root, the protoxylem lies towards periphery and metaxylem lies towards the centre, such arrangement is called Exarch.
AIPMT-2014
Anatomy of Flowering Plants
271672
In the sieve elements, which one of the following is the most likely function of \(\mathrm{P}\) proteins?
1 Deposition of callose on sieve plates
2 Providing energy for active translocation
3 Autolytic enzymes
4 Sealing mechanism on wounding
Explanation:
Exp:D Phloem protein is another name for P-protien. The most important function of P-protein is the sealing mechanism on wounding. They generally play a role during an unfavorable condition where they quickly aggregate at the sieve plate to form a clot when the sieve element is disrupted. It prevents the flow of the phloem sap.
AIIMS-2006
Anatomy of Flowering Plants
271673
Which one of the following statements pertaining to plant structure is correct?
1 cork lacks stomata, but lenticels carry out transpiration
2 passage cells help in transfer of food from cortex to phloem
3 sieve tube elements possess cytoplasm but no nuclei
4 the shoot apical meristem has a quiescent centre
Explanation:
Exp:C Sieve tube elements are the relative type of phloem cells found is angiosperms. Mature sieve tube elements are deep, tublar and do not contain nucleus in the cells with no secondary wall and terminal sieve plate.
271668
Vascular bundles in monocotyledons are considered closed because:
1 Cambium is absent
2 There are no vessels with perforations
3 Xylem is surrounded all around by phloem
4 A bundle sheath surrounds each bundle
Explanation:
Exp:A Vascular bundles in monocotyledons are considered as closed because cambium is absent in the vascular system and thus they lack secondary growth in the thickness. - The xylem and phloem are the two vascular tissues found in plants. Xylem is specialized tissue that involves in the water transportation and movement of nutrients from root to tip of the leaves of a plant. The xylem is present in the inner surface and phloem in the outer surface and cambium is not present in monocot plants.
AIPMT-2015
Anatomy of Flowering Plants
271670
You are given a fairly old piece of dicot stem and a dicot root. Which of the following anatomical structures will you use to distinguish between the two?
1 Secondary xylem
2 Secondary phloem
3 Protoxylem
4 Cortical cells
Explanation:
Exp:C Protoxylem develops during the primary growth of a plant. In stems the protoxylem lies towards the centre (pith) and the metaxylem lies towards the periphery. This type of primary xylem is called endarch. In root, the protoxylem lies towards periphery and metaxylem lies towards the centre, such arrangement is called Exarch.
AIPMT-2014
Anatomy of Flowering Plants
271672
In the sieve elements, which one of the following is the most likely function of \(\mathrm{P}\) proteins?
1 Deposition of callose on sieve plates
2 Providing energy for active translocation
3 Autolytic enzymes
4 Sealing mechanism on wounding
Explanation:
Exp:D Phloem protein is another name for P-protien. The most important function of P-protein is the sealing mechanism on wounding. They generally play a role during an unfavorable condition where they quickly aggregate at the sieve plate to form a clot when the sieve element is disrupted. It prevents the flow of the phloem sap.
AIIMS-2006
Anatomy of Flowering Plants
271673
Which one of the following statements pertaining to plant structure is correct?
1 cork lacks stomata, but lenticels carry out transpiration
2 passage cells help in transfer of food from cortex to phloem
3 sieve tube elements possess cytoplasm but no nuclei
4 the shoot apical meristem has a quiescent centre
Explanation:
Exp:C Sieve tube elements are the relative type of phloem cells found is angiosperms. Mature sieve tube elements are deep, tublar and do not contain nucleus in the cells with no secondary wall and terminal sieve plate.
271668
Vascular bundles in monocotyledons are considered closed because:
1 Cambium is absent
2 There are no vessels with perforations
3 Xylem is surrounded all around by phloem
4 A bundle sheath surrounds each bundle
Explanation:
Exp:A Vascular bundles in monocotyledons are considered as closed because cambium is absent in the vascular system and thus they lack secondary growth in the thickness. - The xylem and phloem are the two vascular tissues found in plants. Xylem is specialized tissue that involves in the water transportation and movement of nutrients from root to tip of the leaves of a plant. The xylem is present in the inner surface and phloem in the outer surface and cambium is not present in monocot plants.
AIPMT-2015
Anatomy of Flowering Plants
271670
You are given a fairly old piece of dicot stem and a dicot root. Which of the following anatomical structures will you use to distinguish between the two?
1 Secondary xylem
2 Secondary phloem
3 Protoxylem
4 Cortical cells
Explanation:
Exp:C Protoxylem develops during the primary growth of a plant. In stems the protoxylem lies towards the centre (pith) and the metaxylem lies towards the periphery. This type of primary xylem is called endarch. In root, the protoxylem lies towards periphery and metaxylem lies towards the centre, such arrangement is called Exarch.
AIPMT-2014
Anatomy of Flowering Plants
271672
In the sieve elements, which one of the following is the most likely function of \(\mathrm{P}\) proteins?
1 Deposition of callose on sieve plates
2 Providing energy for active translocation
3 Autolytic enzymes
4 Sealing mechanism on wounding
Explanation:
Exp:D Phloem protein is another name for P-protien. The most important function of P-protein is the sealing mechanism on wounding. They generally play a role during an unfavorable condition where they quickly aggregate at the sieve plate to form a clot when the sieve element is disrupted. It prevents the flow of the phloem sap.
AIIMS-2006
Anatomy of Flowering Plants
271673
Which one of the following statements pertaining to plant structure is correct?
1 cork lacks stomata, but lenticels carry out transpiration
2 passage cells help in transfer of food from cortex to phloem
3 sieve tube elements possess cytoplasm but no nuclei
4 the shoot apical meristem has a quiescent centre
Explanation:
Exp:C Sieve tube elements are the relative type of phloem cells found is angiosperms. Mature sieve tube elements are deep, tublar and do not contain nucleus in the cells with no secondary wall and terminal sieve plate.
271668
Vascular bundles in monocotyledons are considered closed because:
1 Cambium is absent
2 There are no vessels with perforations
3 Xylem is surrounded all around by phloem
4 A bundle sheath surrounds each bundle
Explanation:
Exp:A Vascular bundles in monocotyledons are considered as closed because cambium is absent in the vascular system and thus they lack secondary growth in the thickness. - The xylem and phloem are the two vascular tissues found in plants. Xylem is specialized tissue that involves in the water transportation and movement of nutrients from root to tip of the leaves of a plant. The xylem is present in the inner surface and phloem in the outer surface and cambium is not present in monocot plants.
AIPMT-2015
Anatomy of Flowering Plants
271670
You are given a fairly old piece of dicot stem and a dicot root. Which of the following anatomical structures will you use to distinguish between the two?
1 Secondary xylem
2 Secondary phloem
3 Protoxylem
4 Cortical cells
Explanation:
Exp:C Protoxylem develops during the primary growth of a plant. In stems the protoxylem lies towards the centre (pith) and the metaxylem lies towards the periphery. This type of primary xylem is called endarch. In root, the protoxylem lies towards periphery and metaxylem lies towards the centre, such arrangement is called Exarch.
AIPMT-2014
Anatomy of Flowering Plants
271672
In the sieve elements, which one of the following is the most likely function of \(\mathrm{P}\) proteins?
1 Deposition of callose on sieve plates
2 Providing energy for active translocation
3 Autolytic enzymes
4 Sealing mechanism on wounding
Explanation:
Exp:D Phloem protein is another name for P-protien. The most important function of P-protein is the sealing mechanism on wounding. They generally play a role during an unfavorable condition where they quickly aggregate at the sieve plate to form a clot when the sieve element is disrupted. It prevents the flow of the phloem sap.
AIIMS-2006
Anatomy of Flowering Plants
271673
Which one of the following statements pertaining to plant structure is correct?
1 cork lacks stomata, but lenticels carry out transpiration
2 passage cells help in transfer of food from cortex to phloem
3 sieve tube elements possess cytoplasm but no nuclei
4 the shoot apical meristem has a quiescent centre
Explanation:
Exp:C Sieve tube elements are the relative type of phloem cells found is angiosperms. Mature sieve tube elements are deep, tublar and do not contain nucleus in the cells with no secondary wall and terminal sieve plate.
