NEET Test Series from KOTA - 10 Papers In MS WORD
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Plant growth and development
166845
Which of the following is not a secondary metabolite ?
1 Anthocyanin
2 Lecithin
3 Curcumin
4 Morphine
Explanation:
B Secondary metabolites are produced by certain micro-organism. It's not essential for the growth and reproduction of organisms from which they are not formed. "Secondary metabolites are the chemical compounds that do not participate in plant metabolism". - Lecithin is not a secondary metabolites because it is a phospholipid. They are found in cell membrane. - Anthocyanin, curcumin and morphine are the secondary metabolites.
[RE-NEET (UG)-06.06.2023 (Manipur)]
Plant growth and development
166849
The gaseous plant growth regulator is used in plants to :
1 kill dicotyledonous weeds in the fields
2 speed up the malting process
3 promote root growth and root hair formation to increase the absorption surface
4 help overcome apical dominance
Explanation:
C The gaseous plant growth regulator is used in plants to promote root growth and root hair formation to increase the absorption surface. Gaseous plant growth regulator is ethylene which helps in root growth and root hair absorption and therefore increases the surface area for absorption. Ethylene promotes water absorption by increasing the root's absorption surface.
[NEET-2022]
Plant growth and development
166851
Which of the following statements are false regarding ethephon?
1 A, B, C only
2 B,C, D only
3 A, C, D only
4 A, B, D only
Explanation:
B Ethephon is a plant growth regulator used to promote fruit ripening, abscission, flower induction and other responses. $\mathrm{C}_{2} \mathrm{H}_{6} \mathrm{ClO}_{3} \mathrm{P}$ is the formula of ethephon. Ethephon is an herbicide, has advantages in controlling the invasive species of Ipomea cairica. - Ethephon in an aqueous solution is readily absorbed and transported within the plant and release ethylene slowly.
[TS EAMCET-30.07.2022 Shift-II]
Plant growth and development
166855
Zeatin isolated from
1 Rice
2 Wheat
3 Agro-bacterium
4 Maize
Explanation:
D The first natural cytokinin was obtained from unripe maize grains of kernels by Letham 1964. It is known as Zeatin ( 6 - hydroxy 3 - methyl 2 - butenyl amino - purine). It also occurs in coconut milk. Zeatin is a plant hormone derived from the purine base called adenine. Zeatin belong to the family growth hormone called cytokinins.
166845
Which of the following is not a secondary metabolite ?
1 Anthocyanin
2 Lecithin
3 Curcumin
4 Morphine
Explanation:
B Secondary metabolites are produced by certain micro-organism. It's not essential for the growth and reproduction of organisms from which they are not formed. "Secondary metabolites are the chemical compounds that do not participate in plant metabolism". - Lecithin is not a secondary metabolites because it is a phospholipid. They are found in cell membrane. - Anthocyanin, curcumin and morphine are the secondary metabolites.
[RE-NEET (UG)-06.06.2023 (Manipur)]
Plant growth and development
166849
The gaseous plant growth regulator is used in plants to :
1 kill dicotyledonous weeds in the fields
2 speed up the malting process
3 promote root growth and root hair formation to increase the absorption surface
4 help overcome apical dominance
Explanation:
C The gaseous plant growth regulator is used in plants to promote root growth and root hair formation to increase the absorption surface. Gaseous plant growth regulator is ethylene which helps in root growth and root hair absorption and therefore increases the surface area for absorption. Ethylene promotes water absorption by increasing the root's absorption surface.
[NEET-2022]
Plant growth and development
166851
Which of the following statements are false regarding ethephon?
1 A, B, C only
2 B,C, D only
3 A, C, D only
4 A, B, D only
Explanation:
B Ethephon is a plant growth regulator used to promote fruit ripening, abscission, flower induction and other responses. $\mathrm{C}_{2} \mathrm{H}_{6} \mathrm{ClO}_{3} \mathrm{P}$ is the formula of ethephon. Ethephon is an herbicide, has advantages in controlling the invasive species of Ipomea cairica. - Ethephon in an aqueous solution is readily absorbed and transported within the plant and release ethylene slowly.
[TS EAMCET-30.07.2022 Shift-II]
Plant growth and development
166855
Zeatin isolated from
1 Rice
2 Wheat
3 Agro-bacterium
4 Maize
Explanation:
D The first natural cytokinin was obtained from unripe maize grains of kernels by Letham 1964. It is known as Zeatin ( 6 - hydroxy 3 - methyl 2 - butenyl amino - purine). It also occurs in coconut milk. Zeatin is a plant hormone derived from the purine base called adenine. Zeatin belong to the family growth hormone called cytokinins.
166845
Which of the following is not a secondary metabolite ?
1 Anthocyanin
2 Lecithin
3 Curcumin
4 Morphine
Explanation:
B Secondary metabolites are produced by certain micro-organism. It's not essential for the growth and reproduction of organisms from which they are not formed. "Secondary metabolites are the chemical compounds that do not participate in plant metabolism". - Lecithin is not a secondary metabolites because it is a phospholipid. They are found in cell membrane. - Anthocyanin, curcumin and morphine are the secondary metabolites.
[RE-NEET (UG)-06.06.2023 (Manipur)]
Plant growth and development
166849
The gaseous plant growth regulator is used in plants to :
1 kill dicotyledonous weeds in the fields
2 speed up the malting process
3 promote root growth and root hair formation to increase the absorption surface
4 help overcome apical dominance
Explanation:
C The gaseous plant growth regulator is used in plants to promote root growth and root hair formation to increase the absorption surface. Gaseous plant growth regulator is ethylene which helps in root growth and root hair absorption and therefore increases the surface area for absorption. Ethylene promotes water absorption by increasing the root's absorption surface.
[NEET-2022]
Plant growth and development
166851
Which of the following statements are false regarding ethephon?
1 A, B, C only
2 B,C, D only
3 A, C, D only
4 A, B, D only
Explanation:
B Ethephon is a plant growth regulator used to promote fruit ripening, abscission, flower induction and other responses. $\mathrm{C}_{2} \mathrm{H}_{6} \mathrm{ClO}_{3} \mathrm{P}$ is the formula of ethephon. Ethephon is an herbicide, has advantages in controlling the invasive species of Ipomea cairica. - Ethephon in an aqueous solution is readily absorbed and transported within the plant and release ethylene slowly.
[TS EAMCET-30.07.2022 Shift-II]
Plant growth and development
166855
Zeatin isolated from
1 Rice
2 Wheat
3 Agro-bacterium
4 Maize
Explanation:
D The first natural cytokinin was obtained from unripe maize grains of kernels by Letham 1964. It is known as Zeatin ( 6 - hydroxy 3 - methyl 2 - butenyl amino - purine). It also occurs in coconut milk. Zeatin is a plant hormone derived from the purine base called adenine. Zeatin belong to the family growth hormone called cytokinins.
166845
Which of the following is not a secondary metabolite ?
1 Anthocyanin
2 Lecithin
3 Curcumin
4 Morphine
Explanation:
B Secondary metabolites are produced by certain micro-organism. It's not essential for the growth and reproduction of organisms from which they are not formed. "Secondary metabolites are the chemical compounds that do not participate in plant metabolism". - Lecithin is not a secondary metabolites because it is a phospholipid. They are found in cell membrane. - Anthocyanin, curcumin and morphine are the secondary metabolites.
[RE-NEET (UG)-06.06.2023 (Manipur)]
Plant growth and development
166849
The gaseous plant growth regulator is used in plants to :
1 kill dicotyledonous weeds in the fields
2 speed up the malting process
3 promote root growth and root hair formation to increase the absorption surface
4 help overcome apical dominance
Explanation:
C The gaseous plant growth regulator is used in plants to promote root growth and root hair formation to increase the absorption surface. Gaseous plant growth regulator is ethylene which helps in root growth and root hair absorption and therefore increases the surface area for absorption. Ethylene promotes water absorption by increasing the root's absorption surface.
[NEET-2022]
Plant growth and development
166851
Which of the following statements are false regarding ethephon?
1 A, B, C only
2 B,C, D only
3 A, C, D only
4 A, B, D only
Explanation:
B Ethephon is a plant growth regulator used to promote fruit ripening, abscission, flower induction and other responses. $\mathrm{C}_{2} \mathrm{H}_{6} \mathrm{ClO}_{3} \mathrm{P}$ is the formula of ethephon. Ethephon is an herbicide, has advantages in controlling the invasive species of Ipomea cairica. - Ethephon in an aqueous solution is readily absorbed and transported within the plant and release ethylene slowly.
[TS EAMCET-30.07.2022 Shift-II]
Plant growth and development
166855
Zeatin isolated from
1 Rice
2 Wheat
3 Agro-bacterium
4 Maize
Explanation:
D The first natural cytokinin was obtained from unripe maize grains of kernels by Letham 1964. It is known as Zeatin ( 6 - hydroxy 3 - methyl 2 - butenyl amino - purine). It also occurs in coconut milk. Zeatin is a plant hormone derived from the purine base called adenine. Zeatin belong to the family growth hormone called cytokinins.
