166956
Which hormone promotes internode/petiole elongation in deep water rice?
1 2, 4-D
2 $\mathrm{GA}_{3}$
3 Kinetin
4 Ethylene
Explanation:
D Ethylene is regarded as a multifunctional phytohormone that regulates both growth and senescence. - It is a gaseous hormone. - Ethylene promotes internode or petiole elongation in deep water rice plants. - Ethylene is a natural product of metabolism in plants. It enhance the respiration rate during the ripening of fruits.
[NEET (UG) 07.05.2023]
Plant growth and development
166961
Which of the following statement is wrong about auxin?
1 2,4-D prevents the growth of dicot weeds
2 2,4-D prevents the growth of monocot weeds
3 It promotes parthenoncarpy
4 IAA is natural auxin
Explanation:
B Phytohormones are growth promoters of auxins. Indole acetic acid (IAA) is an auxin of a natural plant. Artificial auxins used as weedicides are 2,4,-D and 2,4,5-T. Also, naphthalene acetic acid (NAA) is a commonly used an artificial auxin in agriculture. - 2,4- dichlorophenoxy acetic acid is synthetic auxin. It is widely used to remove broad leaved weeds or dicotyledonous weeds in cereal crops. It is also used to prepare weed-free lawns by gardeners. - Auxin is applied to the indole-3- acetic acid (IAA) and to other natural and synthetic compounds having certain growth regulating properties. It also helps to initiate rooting in stem cuttings.
[AIIMS-27.05.2018 Shift-I]
Plant growth and development
166962
Cytokinin involves:
1 Kinetin, zeatin, BAP
2 $\mathrm{GA}_{3}$, IBA, Kinetin
3 Zeatin, $\mathrm{GA}_{3}$, BAP
4 IAA, Zeatin, Kinetin
Explanation:
A Cytokinins are of two types:- - Adenine-type cytokinins, which are represented by kinetin, zeatin and 6- benzylaminopurine (BAP). - Phenylurea-type cytokinins, which are represented by diphenylurea and thidiazuron (TDZ). - $\mathrm{GA}_{3}$ is another phytohormone, gibberellins. IBA and IAA are forms of auxin.
[AIIMS-26.05.2018 Shift-I]
Plant growth and development
166963
Which among the following belong to Auxin?
1 IAA, IBA, CK
2 $\mathrm{GA}_{3}, 2,4-\mathrm{D}$, IAA
3 IAA, IBA, NAA
4 2,4-D, IAA, ABA
Explanation:
C Auxin is naturally occurring plant growth hormone it is produced at the tip of growing shoot and roots and promotes cell elongation. - IAA-Indole -3-acetic acid is universal natural auxin. - IBA-Indole-3- butyric acid with auxin like activity it is both naturally occurring and synthetically prepared. - NAA- Napthalene acetic acid is a synthetic auxin.
166956
Which hormone promotes internode/petiole elongation in deep water rice?
1 2, 4-D
2 $\mathrm{GA}_{3}$
3 Kinetin
4 Ethylene
Explanation:
D Ethylene is regarded as a multifunctional phytohormone that regulates both growth and senescence. - It is a gaseous hormone. - Ethylene promotes internode or petiole elongation in deep water rice plants. - Ethylene is a natural product of metabolism in plants. It enhance the respiration rate during the ripening of fruits.
[NEET (UG) 07.05.2023]
Plant growth and development
166961
Which of the following statement is wrong about auxin?
1 2,4-D prevents the growth of dicot weeds
2 2,4-D prevents the growth of monocot weeds
3 It promotes parthenoncarpy
4 IAA is natural auxin
Explanation:
B Phytohormones are growth promoters of auxins. Indole acetic acid (IAA) is an auxin of a natural plant. Artificial auxins used as weedicides are 2,4,-D and 2,4,5-T. Also, naphthalene acetic acid (NAA) is a commonly used an artificial auxin in agriculture. - 2,4- dichlorophenoxy acetic acid is synthetic auxin. It is widely used to remove broad leaved weeds or dicotyledonous weeds in cereal crops. It is also used to prepare weed-free lawns by gardeners. - Auxin is applied to the indole-3- acetic acid (IAA) and to other natural and synthetic compounds having certain growth regulating properties. It also helps to initiate rooting in stem cuttings.
[AIIMS-27.05.2018 Shift-I]
Plant growth and development
166962
Cytokinin involves:
1 Kinetin, zeatin, BAP
2 $\mathrm{GA}_{3}$, IBA, Kinetin
3 Zeatin, $\mathrm{GA}_{3}$, BAP
4 IAA, Zeatin, Kinetin
Explanation:
A Cytokinins are of two types:- - Adenine-type cytokinins, which are represented by kinetin, zeatin and 6- benzylaminopurine (BAP). - Phenylurea-type cytokinins, which are represented by diphenylurea and thidiazuron (TDZ). - $\mathrm{GA}_{3}$ is another phytohormone, gibberellins. IBA and IAA are forms of auxin.
[AIIMS-26.05.2018 Shift-I]
Plant growth and development
166963
Which among the following belong to Auxin?
1 IAA, IBA, CK
2 $\mathrm{GA}_{3}, 2,4-\mathrm{D}$, IAA
3 IAA, IBA, NAA
4 2,4-D, IAA, ABA
Explanation:
C Auxin is naturally occurring plant growth hormone it is produced at the tip of growing shoot and roots and promotes cell elongation. - IAA-Indole -3-acetic acid is universal natural auxin. - IBA-Indole-3- butyric acid with auxin like activity it is both naturally occurring and synthetically prepared. - NAA- Napthalene acetic acid is a synthetic auxin.
166956
Which hormone promotes internode/petiole elongation in deep water rice?
1 2, 4-D
2 $\mathrm{GA}_{3}$
3 Kinetin
4 Ethylene
Explanation:
D Ethylene is regarded as a multifunctional phytohormone that regulates both growth and senescence. - It is a gaseous hormone. - Ethylene promotes internode or petiole elongation in deep water rice plants. - Ethylene is a natural product of metabolism in plants. It enhance the respiration rate during the ripening of fruits.
[NEET (UG) 07.05.2023]
Plant growth and development
166961
Which of the following statement is wrong about auxin?
1 2,4-D prevents the growth of dicot weeds
2 2,4-D prevents the growth of monocot weeds
3 It promotes parthenoncarpy
4 IAA is natural auxin
Explanation:
B Phytohormones are growth promoters of auxins. Indole acetic acid (IAA) is an auxin of a natural plant. Artificial auxins used as weedicides are 2,4,-D and 2,4,5-T. Also, naphthalene acetic acid (NAA) is a commonly used an artificial auxin in agriculture. - 2,4- dichlorophenoxy acetic acid is synthetic auxin. It is widely used to remove broad leaved weeds or dicotyledonous weeds in cereal crops. It is also used to prepare weed-free lawns by gardeners. - Auxin is applied to the indole-3- acetic acid (IAA) and to other natural and synthetic compounds having certain growth regulating properties. It also helps to initiate rooting in stem cuttings.
[AIIMS-27.05.2018 Shift-I]
Plant growth and development
166962
Cytokinin involves:
1 Kinetin, zeatin, BAP
2 $\mathrm{GA}_{3}$, IBA, Kinetin
3 Zeatin, $\mathrm{GA}_{3}$, BAP
4 IAA, Zeatin, Kinetin
Explanation:
A Cytokinins are of two types:- - Adenine-type cytokinins, which are represented by kinetin, zeatin and 6- benzylaminopurine (BAP). - Phenylurea-type cytokinins, which are represented by diphenylurea and thidiazuron (TDZ). - $\mathrm{GA}_{3}$ is another phytohormone, gibberellins. IBA and IAA are forms of auxin.
[AIIMS-26.05.2018 Shift-I]
Plant growth and development
166963
Which among the following belong to Auxin?
1 IAA, IBA, CK
2 $\mathrm{GA}_{3}, 2,4-\mathrm{D}$, IAA
3 IAA, IBA, NAA
4 2,4-D, IAA, ABA
Explanation:
C Auxin is naturally occurring plant growth hormone it is produced at the tip of growing shoot and roots and promotes cell elongation. - IAA-Indole -3-acetic acid is universal natural auxin. - IBA-Indole-3- butyric acid with auxin like activity it is both naturally occurring and synthetically prepared. - NAA- Napthalene acetic acid is a synthetic auxin.
166956
Which hormone promotes internode/petiole elongation in deep water rice?
1 2, 4-D
2 $\mathrm{GA}_{3}$
3 Kinetin
4 Ethylene
Explanation:
D Ethylene is regarded as a multifunctional phytohormone that regulates both growth and senescence. - It is a gaseous hormone. - Ethylene promotes internode or petiole elongation in deep water rice plants. - Ethylene is a natural product of metabolism in plants. It enhance the respiration rate during the ripening of fruits.
[NEET (UG) 07.05.2023]
Plant growth and development
166961
Which of the following statement is wrong about auxin?
1 2,4-D prevents the growth of dicot weeds
2 2,4-D prevents the growth of monocot weeds
3 It promotes parthenoncarpy
4 IAA is natural auxin
Explanation:
B Phytohormones are growth promoters of auxins. Indole acetic acid (IAA) is an auxin of a natural plant. Artificial auxins used as weedicides are 2,4,-D and 2,4,5-T. Also, naphthalene acetic acid (NAA) is a commonly used an artificial auxin in agriculture. - 2,4- dichlorophenoxy acetic acid is synthetic auxin. It is widely used to remove broad leaved weeds or dicotyledonous weeds in cereal crops. It is also used to prepare weed-free lawns by gardeners. - Auxin is applied to the indole-3- acetic acid (IAA) and to other natural and synthetic compounds having certain growth regulating properties. It also helps to initiate rooting in stem cuttings.
[AIIMS-27.05.2018 Shift-I]
Plant growth and development
166962
Cytokinin involves:
1 Kinetin, zeatin, BAP
2 $\mathrm{GA}_{3}$, IBA, Kinetin
3 Zeatin, $\mathrm{GA}_{3}$, BAP
4 IAA, Zeatin, Kinetin
Explanation:
A Cytokinins are of two types:- - Adenine-type cytokinins, which are represented by kinetin, zeatin and 6- benzylaminopurine (BAP). - Phenylurea-type cytokinins, which are represented by diphenylurea and thidiazuron (TDZ). - $\mathrm{GA}_{3}$ is another phytohormone, gibberellins. IBA and IAA are forms of auxin.
[AIIMS-26.05.2018 Shift-I]
Plant growth and development
166963
Which among the following belong to Auxin?
1 IAA, IBA, CK
2 $\mathrm{GA}_{3}, 2,4-\mathrm{D}$, IAA
3 IAA, IBA, NAA
4 2,4-D, IAA, ABA
Explanation:
C Auxin is naturally occurring plant growth hormone it is produced at the tip of growing shoot and roots and promotes cell elongation. - IAA-Indole -3-acetic acid is universal natural auxin. - IBA-Indole-3- butyric acid with auxin like activity it is both naturally occurring and synthetically prepared. - NAA- Napthalene acetic acid is a synthetic auxin.
