Light is the dominant environmental signal that controls stomatal movement in leaves of well-watered plants grown in a natural environment. Which one of the following wavelengths of light is responsible for such regulation?

• Red light

• Blue light

• Green light

• Far-red light

The quantum yield of oxygen evolution during photosynthesis drastically drops in far-red light. This effect is known as:

• Far-red drop

• Red drop

• Blue drop

• Visible spectrum drop

Following are certain statements regarding seed development in plants:

A. During final phase of development, embryos of "orthodox" seeds become tolerant to desiccation, dehydrate losing up to 90% of water.

B. Dormant seeds will germinate upon rehydration while quiescent seeds require additional treatments or signals for germination.

C. Precocious germination is germination of seeds without passing through the normal quiescent and/ or dormant stage of development.

D. Abscisic acid is known to inhibit precocious germination.

Which one of the following combinations is correct? 

• A, B, and C

• A, B, and D

• B, C, and D

• A, C, and D

Which one of the following statements regarding seed germination of a wild type plant is NOT correct?

• Low ABA and high bioactive GA can break seed dormancy.

• Light accompanied with high temperature can break seed dormancy.

• GA induces synthesis of hydrolytic enzymes in cereal grains.

• Degradation of carbohydrates and storage proteins provide nourishment and energy to support seedling growth.

Which one of the following enzymes is NOT a part of the pyruvate dehydrogenase enzyme complex in glycolysis pathway?

• Pyruvate dehydrogease

• Dihydrolipoyl transferase

• Dihydrolipoyl dehydrogenase

• Dihydrolipoyl oxidase

Carbohydrates synthesizes by photosynthesis are converted into sucrose and transported via phloem to other parts of the plant. The following aspects are associated with sucrose uploading in phloem and its transport:

A. Both reducing and non-reducing sugars are transported efficiently through phloem.

B. Sucrose uploading can be both symplastic and apoplastic.

C. The route of phloem uploading is mesophyll cells → phloem parenchyma → companion cells → sieve tubes.

D. Transport in sieve tubes is as per the 'pressure-flow model'.?

Which one of the following combinations is correct

• A, B and C

• B, C and D

• C, D and A

• D, B and A

Which one of the following compounds is generally translocated in the phloem?

• Sucrose

• D-glucose

• D-mannose

• D-fructose

Nitrogen gas is reduced to ammonia by the nitrogen fixation method. In order to execute the process, which one of the following compounds is usually required?

• ATP

• GTP

• UDP

• ADP

A 'Z' scheme describes electron transport in O₂-evolving photosynthetic organisms. The direction of electron flow is presented in the following sequences:

A. P680* → Pheophytin → Q_A → Q_B → PC → cytochrome b₆f → P700

B. P700* → Phylloquinone-FeS_A → FeS_B → FeS_x → Fd

C. P680* → Pheophytin → Q_A → Q_B → cytochrome b₆f → PC → P700

D. P700* → Phylloquinone → FeS_X → FeS_A → FeS_B → Fd

Which one of the following combinations is correct?

• A and B

• B and C

• C and D

• D and A

Symbiotic nitrogen fixation in legume nodules involves complex interaction between Rhizobium and legume roots. This complex interaction is governed by

A. Integration of sym plasmid of Rhizobium in the root nuclear genome.

B. Sensing of plant flavonoids by rhizobia.

C. Activation of nod genes in rhizobia.

D. Activation of NODULIN genes in legume roots.

Which one of thefollowign combinations is correct?

• A, B and C

• A, C and D

• B, C and D

• A, B and D