During non-cyclic photophosphorylation, when electrons are lost from the reaction centre at PS II, what is the source which replaces these electrons?

NEET-(Oct)2020 Photosynthesis-in-Higher-Plants [class-xi ]

• Oxygen
• Water
• Carbon dioxide
• Light
Correct Option: B  [ Water ]

Remark:

Pyruvate dehydrogenase activity during aerobic respiration requires:

NEET-(Oct)2020 Respiration-in-Plants [class-xi ]

• Calcium
• Iron
• Cobalt
• Magnesium
Correct Option: D  [ Magnesium ]

Remark:

The number of substrate level phosphorylations in one turn of citric acid cycle is:

NEET-(Sept)2020 Respiration-in-Plants [class-xi ]

• Zero
• One
• Two
• Three
Correct Option: B  [ One ]

Remark:

Inhibitory substances in dormant seeds cannot be removed by subjecting seeds to:

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

• Gibberellic acid
• Nitrate
• Ascorbic acid
• Chilling conditions
Correct Option: C  [ Ascorbic acid ]

Remark:

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:

Which of the following is incorrect for wind-pollinated plants?

NEET-(Oct)2020 Sexual-Reproduction-in-Flowering-Plants [class-xii ]

• Well exposed stamens and stigma
• Many ovules in each ovary
• Flowers are small and not brightly coloured
• Pollen grains are light and non-sticky
Correct Option: B  [ Many ovules in each ovary ]

Remark: