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The Sign of Life - 2

Description: The Sign of Life – 2
Number of Questions: 15
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Tags: The Sign of Life – 2 Plant Cell Nutrition in Other Organisms Excretion in Plants Photosynthesis: Light Reaction Photosynthesis: Dark Reaction
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Which among the following statements does not characterise the chloroplasts of the plant cells?

  1. All chloroplasts have at least three membrane systems.

  2. Many chloroplast DNAs contain numerous inverted repeats.

  3. Cyanobacteria are considered the ancestors of chloroplasts.

  4. In land plants, chloroplasts are generally lens-shaped.

  5. The inner chloroplast membrane regulates the passage of material.

Show answer
Correct Option: B
Explanation:

Many chloroplast DNAs contain two inverted repeats, which separate a long single copy section (LSC) from a short single copy section (SSC). While a given pair of inverted repeats is rarely completely identical, they are always very similar to each other, apparently resulting from concerted evolution.

Which of the following statements is/are false?

a. Chromoplasts are white in colour. b. Leucoplasts can change to other types of plastids. c. Chromoplasts provide colour to organs to attract pollinators and disseminators.

  1. Only a

  2. Only a and b

  3. Only b

  4. Only b and c

  5. Only c

Show answer
Correct Option: A
Explanation:

This is the correct option as this is a false statement. The chromoplasts are the coloured plastids.

Match the following:

 
a. Chromoplasts 1. Green-coloured plastids
b. Chloroplasts 2. Coloured plastids (except green colour)
c. Leucoplasts 3. The colourless plastids

  1. a - 2, b - 1, c - 3

  2. a - 2, b - 3, c - 1

  3. a - 1, b - 3, c - 2

  4. a - 1, b - 2, c - 3

  5. a - 3, b - 1, c - 2

Show answer
Correct Option: A
Explanation:

This is the correct option. Chromoplasts are the coloured plastids (except green colour). Chloroplasts are the green-coloured plastids. Leucoplasts are the colourless plastids.

During light reaction of photosynthesis, which of the following happens?

  1. Polysaccharides are generated in pyrenoid.

  2. Carbohydrates are synthesised from CO2 and water.

  3. Photons from sunlight are trapped to produce ATP and O2.

  4. All of the above

Show answer
Correct Option: C
Explanation:

Photons from sunlight are trapped to produce ATP and O2. The light reaction of photosynthesis is also called Hill reaction. This is the first step of photosynthesis where light energy from the sun is absorbed by chlorophyll and hydrolyses H2O to produce O2 and H+ ions. This H+ further reduces NADP to NADPH which finally produces ATP from ADP and Pi. This total step is called photophosphorylation.

Which of the following is the waste product produced by plants during photosynthesis?

  1. Carbon dioxide

  2. Water vapour

  3. Nitrogen

  4. Oxygen

  5. Hydrogen

Show answer
Correct Option: D
Explanation:

This is the correct option as oxygen is the waste product produced by plants during photosynthesis. Oxygen is the waste product produced by plants during photosynthesis.

Which of the following statements is/are false?

a. The aquatic plants use the carbon dioxide gas dissolved in water for carrying out photosynthesis. b. In narrow-leaved plants, the stomata occurs only in the narrow surface of the leaf. c. The opening and closing of the stomatal pores is controlled by the guard cells.

  1. Only a

  2. Only a and b

  3. Only b

  4. Only b and c

  5. Only c

Show answer
Correct Option: C
Explanation:

This is the correct option as this statement is false. In narrow-leaved plants, the stomata are equally distributed on both the sides of the leaf.

Which of the following statements is/are false?

a. In autotrophic nutrition, inorganic material, i.e. food is made from inorganic materials like carbon dioxide and water by utilising the solar energy. b. The organisms which can make their own food from carbon dioxide and water are called autotrophs. c. The autotrophic organisms contain the green pigment called chlorophyll which is capable of trapping solar energy.

  1. Only a

  2. Only a and b

  3. Only b

  4. Only b and c

  5. Only c

Show answer
Correct Option: A
Explanation:

This is the correct option as this statement is false. In autotrophic nutrition, organic material, i.e. food, and not inorganic material is made from inorganic materials like carbon dioxide and water by utilising the solar energy.

Which of the following processes primarily occurs in photosynthesis?

  1. Carbon dioxide is reduced to carbohydrates.

  2. NADH is reduced to NAD.

  3. ATP is generated.

  4. Oxidative phosphorylation occurs.

  5. -

Show answer
Correct Option: A
Explanation:

The main feature of photosynthesis is the reduction of carbon dioxide to carbohydrates in the presence of light energy obtained by sunlight in green plants.

Which of the following statements is/are false?

a. The xylem vessel is a non-living, long tube which runs like a drain pipe through the plant. b. Xylem vessels contain cytoplasm and nuclei. c. In flowering plants, either only xylem vessels transport water or both xylem vessels and tracheids transport water.

  1. Only a

  2. Only a and b

  3. Only b

  4. Only b and c

  5. Only c

Show answer
Correct Option: C
Explanation:

This is the correct option as this statement is false. Xylem vessels do not contain cytoplasm or nuclei.

During photosynthesis, water is split into its constituents. This process is known as

  1. hydrolysis

  2. photolysis

  3. plasmolysis

  4. hemolysis

  5. -

Show answer
Correct Option: B
Explanation:

Photolysis occurs in photosynthesis. The splitting of water in the presence of sunlight is called photolysis.

Which of the following events does not occur during photosynthesis?

  1. Absorption of light energy by roots

  2. Conversion of light energy to chemical energy

  3. Splitting of water molecules into hydrogen and oxygen

  4. Reduction of carbon dioxide into carbohydrates

Show answer
Correct Option: A
Explanation:

During photosynthesis, light energy is absorbed by chlorophyll which is present in the leaves of a plant.

Where does the dark reaction of photosynthesis occur?

  1. Grana

  2. Stroma

  3. Matrix

  4. Cytoplasm

Show answer
Correct Option: B
Explanation:

The dark reaction of photosynthesis occurs in stroma.

Photosynthesis consists of two phases; a light reaction and a dark reaction. Dark reaction in photosynthesis is called 'dark' because

  1. it can also occur in dark

  2. it does not require light energy

  3. None of these

  4. Both of these

  5. -

Show answer
Correct Option: B
Explanation:

Dark reaction is the second phase of photosynthesis. In dark reaction, the energy absorbed in light reaction is assimilated in the form of carbohydrates.

The products formed at the end of a 'dark reaction' are

  1. RuBP, ADP, ip, NADP and glucose

  2. RuBP, ATP, NADPH and glucose

  3. glucose

  4. oxygen and glucose

Show answer
Correct Option: A
Explanation:

The products formed at the end of a 'dark reaction' are RuBP, ADP, ip, NADP and glucose.

Dark reaction is traced by

  1. X-rays

  2. O18

  3. 14CO2

  4. P32

Show answer
Correct Option: C
Explanation:

Dark reaction is traced by 14CO2.

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