What Is Dark Reaction

Q.

The Calvin cycle proceeds in three stages:

1. Reduction, during which carbohydrate is formed at the expense of the photochemically made ATP and NADPH.

2. Regeneration, during which the carbon dioxide acceptor ribulose-1, 5-bisphosphate is formed.

3. Carboxylation, during which carbon dioxide combines with rubulose-1, 5-biphosphate.

Identify the correct sequence.

1. 3-1-2

2. 2-1-3

3. 3-2-1

4. 1-2-3

5. 1-3-2

Q. Biosynthetic phase of photosynthesis Involves

1. Photolysis of water
2. Reduction of carbon dioxide to the level of organic compounds.
3. Photophosphorylation.
4. Activation of chlorophyll molecule.
   

Q.

In the process of carbon fixation, RuBP attaches a CO2 to produce a 6 carbon molecule, which is then split intwo. After phosphorylation and reduction, what more needs to happen in the Calvin cycle?

1. addition of a pair of electrons from NADPH

2. inactivation of RuBP carboxylase enzyme

3. regeneration of ATP from ADP

4. regeneration of rubisco

Q. The primary function of the light-independent reaction in photosynthesis is

1. to synthesize ATP and NADPH
2. to provide food to plant in form of glucose
3. to produce carbon dioxide
4. all of these

Q.

What are the steps in photosynthesis?

Q. In the higher plants, stroma in the chloroplasts contains

1. chlorophyll a
2. chlorophyll b
3. light-­dependent reaction enzymes
4. light­-independent reaction enzymes

Q.

Why is the colour of a leaf kept in the dark frequently yellow, or pale green? Which pigment do you think is more stable?

Q. In the following question, a statement of assertion is followed by a statement of reason. Mark the correct choice as:
Assertion: In light reaction of photosynthesis, light is required for the functioning of PS I and PS II, and production of NADPH and ATP.
Reason: Dark reaction does not occur in light.

1. If both assertion and reason are true and reason is the correct explanation of assertion.
   
2. If both assertion and reason are true but reason is not the correct explanation of assertion.
   
3. If assertion is true but reason is false.
   
4. If both assertion and reason are false.

Q. Choose the incorrect statement regarding pteridophytes.

1. Sporophyte is dominant phase
2. Prothallus is unicellular
3. Gametophyte is independent
4. Pteridophytes are frequently grown as ornamentals and also used for medicinal purposes

Q. A fern is

1. non-vascular and non-flowering
2. vascular and non-flowering
3. non-vascular and flowering
4. vascular and flowering

Q. Pteridophytes are not the first group of plants to have true roots, stem and leaves.

1. False
2. True

Q.

The dark reaction in photosynthesis is called so because

1. It can occur in dark also.

2. It occurs more rapidly at night.

3. It cannot occur during day light.

4. It does not depend on light energy.

Q.

NADH is produced during

1. the Krebs cycle

2. the oxidation of pyruvate

3. glycolysis

4. all of the above

Q. Which of the following products from light dependent reaction is used as a source of energy in the light independent reactions?

1. NADPH
2. Oxygen
3. Glucose
4. ADP

Q.

WHAT IS THE ROLE OF RuBP IN BIOSYNTHETIC PROCESS ?

Q. Pteridophytes are intermediates between

1. bryophytes and gymnosperms
2. gymnosperms and angiosperms
3. thallophytes and bryophytes
4. bryophytes and angiosperms

Q. Pteridophyte plants differ from bryophytes on which basis ?

1. Vascular tissue
2. Zoospores
3. Male reproductive organ
4. Aplanospores

Q.

Why is RuBisCo more appropriately called RUBP carboxylase - oxygenase and what important role does it play in photosynthesis.

Q.

why interphase is called resting phase of the cell?

Q. Ferns have horizontal stems called

1. fronds
2. rhizoids
3. rhizomes
4. rhizophore

Q.

Define Photosynthesis.

Q. In photosynthesis energy from light reaction to dark reaction is transferred in the form of:

1. ADP
2. ATP
3. RuDP
4. Chlorophyll

Q. In a chloroplast, enzymatic reaction to synthesize sugar takes place in

1. the lumen of the thylakoids
2. stroma
3. ribosome
4. stroma lamellae

Q. First terrestrial plants to possess vascular tissues are:

1. Bryophytes
2. Gymnosperms
3. Pteridophytes
4. Angiosperms

Q. Botanical name of Sanjeevani is:

1. S. chrysocaulous
2. Selaginella pallescens
3. Selaginella bryopteris
4. S. kraussiana

Q. Which is a ‘rootless fern’?

1. Pteris
2. Dryopteris
3. Azolla
4. Salvinia

Q. During photosynthesis, light is not necessary for

1. Electron transport
2. excitement of chlorophyll molecule
3. Photolysis
4. Reduction of $C{O}_2$ to the level of carbohydrate

Q. Mosses and ferns are found in moist and shady places as both:

1. Require presence of water for fertilisation.
2. Depend for their nutrients on microorganisms which can survive only in low temperature.
3. Do not need sunlight for photosynthesis.
4. Cannot compete with sun loving plants.

Q. Pteridophytes grow well in partly shade locations where soil is moist and well drained.

1. False
2. True

Q.

In Pteridophytes, the xylem mainly consists of:

1. Sclereids

2. Vessels

3. Tracheids

4. All of the above