1 tumors formed due to bacterial injection of wounds
2 outgrowth of secondary tissue over wounds
3 injury caused by insects
4 none of these
Explanation:
(b)Roots: When wounds around cells undergo rapid cell division, the wound is covered by cells but the wound is not completely healed up, and so in adult stem knots are established.
NCERT 92
Anatomy of Flowering Plants(NCERT)
285786
Trees near sea do not have annual rings because
1 soil is sandy
2 there is climatic variation
3 there is no marked climate variation
4 there is enough moisture in the atmosphere
Explanation:
(c)Because in seashore area, being isothermal zones, temperature in constant throughout the year, so there will be the annual ring formation.
NCERT 96
Anatomy of Flowering Plants(NCERT)
285787
Study statements regarding roots and select the incorrect one(s).
(i) Lateral roots develop from pericycle.
(ii) Endodermis is the inner most layer of cortex.
(iii) Sapwood is the central, dark coloured, nonconducting part of secondary xylem.
1 i and ii
2 ii and iii
3 i only
4 iii only
Explanation:
(d)An old stem’s central wood is duramen (heartwood). It is dark without living cells which is a part of secondary xylem. Tracheary elements, plugged by tyloses, have deposition of tannins, reins, gums, etc. Heartwood is more durable, is heavier and has less susceptibility from attack of pathogens and insects. It is mechanical in function. Peripheral portion of trunk is light in colour and soft which performs the function of conduction of water and minerals. It is known as sapwood or alburnum.
NCERT 90
Anatomy of Flowering Plants(NCERT)
285788
The collective term used for phelloderm (secondary cortex) cork cambium (phellogen) and cork (phellem) is
1 pericycle
2 periderm
3 protoderm
4 procambium
Explanation:
(b)To prevent harm and to increase the girth on the outer ground tissues due to the formation of secondary vascular tissues, dicot stems produce a cork cambium or phellogen in the outer cortical cells. The cells of this phellogen divide periclinally to produce phellem or cork on the outer side and secondary cortex or phelloderm on the inner side. Phellem, phellogen, phelloderm collectively constitute peridium.
1 tumors formed due to bacterial injection of wounds
2 outgrowth of secondary tissue over wounds
3 injury caused by insects
4 none of these
Explanation:
(b)Roots: When wounds around cells undergo rapid cell division, the wound is covered by cells but the wound is not completely healed up, and so in adult stem knots are established.
NCERT 92
Anatomy of Flowering Plants(NCERT)
285786
Trees near sea do not have annual rings because
1 soil is sandy
2 there is climatic variation
3 there is no marked climate variation
4 there is enough moisture in the atmosphere
Explanation:
(c)Because in seashore area, being isothermal zones, temperature in constant throughout the year, so there will be the annual ring formation.
NCERT 96
Anatomy of Flowering Plants(NCERT)
285787
Study statements regarding roots and select the incorrect one(s).
(i) Lateral roots develop from pericycle.
(ii) Endodermis is the inner most layer of cortex.
(iii) Sapwood is the central, dark coloured, nonconducting part of secondary xylem.
1 i and ii
2 ii and iii
3 i only
4 iii only
Explanation:
(d)An old stem’s central wood is duramen (heartwood). It is dark without living cells which is a part of secondary xylem. Tracheary elements, plugged by tyloses, have deposition of tannins, reins, gums, etc. Heartwood is more durable, is heavier and has less susceptibility from attack of pathogens and insects. It is mechanical in function. Peripheral portion of trunk is light in colour and soft which performs the function of conduction of water and minerals. It is known as sapwood or alburnum.
NCERT 90
Anatomy of Flowering Plants(NCERT)
285788
The collective term used for phelloderm (secondary cortex) cork cambium (phellogen) and cork (phellem) is
1 pericycle
2 periderm
3 protoderm
4 procambium
Explanation:
(b)To prevent harm and to increase the girth on the outer ground tissues due to the formation of secondary vascular tissues, dicot stems produce a cork cambium or phellogen in the outer cortical cells. The cells of this phellogen divide periclinally to produce phellem or cork on the outer side and secondary cortex or phelloderm on the inner side. Phellem, phellogen, phelloderm collectively constitute peridium.
1 tumors formed due to bacterial injection of wounds
2 outgrowth of secondary tissue over wounds
3 injury caused by insects
4 none of these
Explanation:
(b)Roots: When wounds around cells undergo rapid cell division, the wound is covered by cells but the wound is not completely healed up, and so in adult stem knots are established.
NCERT 92
Anatomy of Flowering Plants(NCERT)
285786
Trees near sea do not have annual rings because
1 soil is sandy
2 there is climatic variation
3 there is no marked climate variation
4 there is enough moisture in the atmosphere
Explanation:
(c)Because in seashore area, being isothermal zones, temperature in constant throughout the year, so there will be the annual ring formation.
NCERT 96
Anatomy of Flowering Plants(NCERT)
285787
Study statements regarding roots and select the incorrect one(s).
(i) Lateral roots develop from pericycle.
(ii) Endodermis is the inner most layer of cortex.
(iii) Sapwood is the central, dark coloured, nonconducting part of secondary xylem.
1 i and ii
2 ii and iii
3 i only
4 iii only
Explanation:
(d)An old stem’s central wood is duramen (heartwood). It is dark without living cells which is a part of secondary xylem. Tracheary elements, plugged by tyloses, have deposition of tannins, reins, gums, etc. Heartwood is more durable, is heavier and has less susceptibility from attack of pathogens and insects. It is mechanical in function. Peripheral portion of trunk is light in colour and soft which performs the function of conduction of water and minerals. It is known as sapwood or alburnum.
NCERT 90
Anatomy of Flowering Plants(NCERT)
285788
The collective term used for phelloderm (secondary cortex) cork cambium (phellogen) and cork (phellem) is
1 pericycle
2 periderm
3 protoderm
4 procambium
Explanation:
(b)To prevent harm and to increase the girth on the outer ground tissues due to the formation of secondary vascular tissues, dicot stems produce a cork cambium or phellogen in the outer cortical cells. The cells of this phellogen divide periclinally to produce phellem or cork on the outer side and secondary cortex or phelloderm on the inner side. Phellem, phellogen, phelloderm collectively constitute peridium.
1 tumors formed due to bacterial injection of wounds
2 outgrowth of secondary tissue over wounds
3 injury caused by insects
4 none of these
Explanation:
(b)Roots: When wounds around cells undergo rapid cell division, the wound is covered by cells but the wound is not completely healed up, and so in adult stem knots are established.
NCERT 92
Anatomy of Flowering Plants(NCERT)
285786
Trees near sea do not have annual rings because
1 soil is sandy
2 there is climatic variation
3 there is no marked climate variation
4 there is enough moisture in the atmosphere
Explanation:
(c)Because in seashore area, being isothermal zones, temperature in constant throughout the year, so there will be the annual ring formation.
NCERT 96
Anatomy of Flowering Plants(NCERT)
285787
Study statements regarding roots and select the incorrect one(s).
(i) Lateral roots develop from pericycle.
(ii) Endodermis is the inner most layer of cortex.
(iii) Sapwood is the central, dark coloured, nonconducting part of secondary xylem.
1 i and ii
2 ii and iii
3 i only
4 iii only
Explanation:
(d)An old stem’s central wood is duramen (heartwood). It is dark without living cells which is a part of secondary xylem. Tracheary elements, plugged by tyloses, have deposition of tannins, reins, gums, etc. Heartwood is more durable, is heavier and has less susceptibility from attack of pathogens and insects. It is mechanical in function. Peripheral portion of trunk is light in colour and soft which performs the function of conduction of water and minerals. It is known as sapwood or alburnum.
NCERT 90
Anatomy of Flowering Plants(NCERT)
285788
The collective term used for phelloderm (secondary cortex) cork cambium (phellogen) and cork (phellem) is
1 pericycle
2 periderm
3 protoderm
4 procambium
Explanation:
(b)To prevent harm and to increase the girth on the outer ground tissues due to the formation of secondary vascular tissues, dicot stems produce a cork cambium or phellogen in the outer cortical cells. The cells of this phellogen divide periclinally to produce phellem or cork on the outer side and secondary cortex or phelloderm on the inner side. Phellem, phellogen, phelloderm collectively constitute peridium.
