Match the following concerning the activity/function and the phytohormone involved:

NEET-(Oct)2020 [Plant-Growth-and-Development] [class-xi ]

• (A)-(II), (B)-(III), (C)-(IV), (D)-(I)
• (A)-(III), (B)-(IV), (C)-(II), (D)-(I)
• (A)-(IV), (B)-(III), (C)-(II), (D)-(I)
• (A)-(IV), (B)-(II), (C)-(I), (D)-(III)
Correct Option: C  [ (A)-(IV), (B)-(III), (C)-(II), (D)-(I) ]

Remark:

A species which was introduced for ornamentation but has become a trouble-some weed in India:

NEET-(Oct)2020 [Plant-Growth-and-Development] [class-xi ]

• Parthenium hysterophorus
• Eichhornia crassipes
• Prosopis juliflora
• Trapa spinosa
Correct Option: B  [ Eichhornia crassipes ]

Remark:

Which of the following is not an inhibitory substance governing seed dormancy?

NEET-(Sept)2020 [Plant-Growth-and-Development] [class-xi ]

• Gibberellic acid
• Abscisic acid
• Phenolic acid
• Para-ascorbic acid
Correct Option: A  [ Gibberellic acid ]

Remark:

The process of growth is maximum during:

NEET-(Sept)2020 [Plant-Growth-and-Development] [class-xi ]

• Log phase
• Lag phase
• Senescence
• Dormancy
Correct Option: A  [ Log phase ]

Remark:

Name the plant growth regulator which upon spraying on sugarcane crop, increases the length of stem, thus increasing the yield of sugarcane crop.

NEET-(Sept)2020 [Plant-Growth-and-Development] [class-xi ]

• Cytokinin
• Gibberellin
• Ethylene
• Abscisic acid
Correct Option: B  [ Gibberellin ]

Remark:

It takes very long time for pineapple plants to produce flowers. Which combination of hormones can be applied to artificially induce flowering in pineapple plants throughout the year to increase yield?

NEET-2019 [Plant-Growth-and-Development] [class-xi ]

• Gibberellin and Cytokinin
• Gibberellin and Abscisic acid
• Cytokinin and Abscisic acid
• Auxin and Ethylene
Correct Option: D  [ Auxin and Ethylene ]

Remark:

What is the site of perception of photoperiod necessary for induction of flowering in plants:

NEET-2019 [Plant-Growth-and-Development] [class-xi ]

• Lateral buds
• Pulvinus
• Leaves
• Shoot apex
Correct Option: C  [ Leaves ]

Remark:

Formation of interfascicular cambium from fully developed parenchyma cells is an example for:

NEET-2024 [Plant-Growth-and-Development] [class-xi ]

• Redifferentiation
• Differentiation
• Maturation
• Dedifferentiation
Correct Option: D  [ Dedifferentiation ]

Remark: Explanation: NCERT Page no. 245

Auxin is used by gardeners to prepare weed-free lawns. But no damage is caused to grass as auxin:

NEET-2024 [Plant-Growth-and-Development] [class-xi ]

• promotes abscission of mature leaves only.
• promotes apical dominance.
• can help in cell division in grasses, to produce growth.
• does not affect mature monocotyledonous plants.
Correct Option: D  [ does not affect mature monocotyledonous plants. ]

Remark: Explanation: NCERT Page No.176, (Topic-13.4.3.1 Auxins)

Spraying sugarcane crop with which of the following plant growth regulators, increases the length of stem, thus, increasing the yield?

NEET-2024 [Plant-Growth-and-Development] [class-xi ]

• Gibberellin
• Auxin
• Abscisic acid
• Cytokinin
Correct Option: A  [ Gibberellin ]

Remark: Explanation: NCERT Page No.176, (Topic-13.4.3.2 13.4.3.2 Gibberellins)