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The Sign of Life - 1

Description: The Sign of Life – 1
Number of Questions: 15
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Tags: The Sign of Life – 1 The Sign of Life Plant Cell Photosynthesis: Light Reaction Photosynthesis: Dark Reaction Nutrition in Other Organisms
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Which among the following is found in the inner chloroplast membrane?

  1. Pyrenoids

  2. Chloroplast ribosomes

  3. Plastoglobuli

  4. Stroma

  5. Peripheral reticulum

Show answer
Correct Option: D
Explanation:

The protein-rich alkaline aqueous fluid within the inner chloroplast membrane and outside of the thylakoid space is called the stroma, which corresponds to the cytosol of the original cyanobacterium.  

Which among the following functions is not done by the cell wall of plant cells?

  1. Carbohydrate storage

  2. Communication with other cells

  3. Cell signaling

  4. Passage of substances

  5. Controlling turgor pressure

Show answer
Correct Option: B
Explanation:

The protein molecules in the cell membrane receive signals from other cells or the outside environment and convert the signals to messages that are passed to the organelles inside the cell.

Which of the following is an olive green colored chlorophyll?

  1. Chlorophyll a

  2. Chlorophyll b

  3. Chlorophyll c

  4. Chlorophyll d

  5. Chlorophyll f

Show answer
Correct Option: B
Explanation:

Chlorophyll b is an olive green pigment found only in the chloroplasts of plants, green algae, any secondary chloroplasts obtained through the secondary endosymbiosis of a green alga, and a few cyanobacteria. It is the chlorophylls a and b together that make most plant and green algal chloroplasts green.

Which of the following statements is/are false?

a. In plant cells, a cell wall, composed mainly of cellulose, is located inside the cell membrane. b. Chromoplasts that contain chlorophyll are called chloroplasts and they perform photosynthesis. c. The energy required for various chemical activities needed for life is released by mitochondria in the form of adenosine triphopshate molecules.

  1. Only a

  2. Both a and b

  3. Only b

  4. Both b and c

  5. Only c

Show answer
Correct Option: A
Explanation:

This is the correct option. In plant cells, a cell wall, composed mainly of cellulose, is located outside the cell membrane.

Which of the following statements is/are false?

a. Stroma are the main functioning unit of the chloroplasts. b. The food vacuole of a single-celled organism contains the food item that the animal has consumed. c. Chloroplasts add colour to the organs for attracting animals to perform pollination and fruit dispersal.

  1. Only a

  2. Both a and b

  3. Only b

  4. Both b and c

  5. Only c

Show answer
Correct Option: A
Explanation:

This is the correct option.

Match the following:

 
Cell Organelles Functions they perform
a. Ribosomes 1. Food synthesis
b. Chloroplasts 2. They digest excess or worn-out organelles and food particles.
c. Lysosomes 3. They are the sites of protein manufacture.

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

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

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

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

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

Show answer
Correct Option: B
Explanation:

This is the correct option.

Which of the following statements is/are false?

a. Plant cells are larger than animal cells. b. Vacuoles in plant cells are many, small and temporary. c. Plant cells lack centrosome and centrioles.

  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 is a wrong statement. Most mature plant cells have a permanent and large central sap vacuole.

Which of the following is the site of 'dark reaction' during photosynthesis, that involves chloroplasts?

  1. Granum

  2. Thylakoid

  3. Lamella

  4. Stroma

  5. Ribosome

Show answer
Correct Option: D
Explanation:

This is the correct option. Stroma is the site of 'dark reaction' during photosynthesis, that involves chloroplasts. Ribosome is a minute particle consisting of RNA and associated proteins found in large numbers in the cytoplasm of living cells. They bind messenger RNA and transfer RNA to synthesise polypeptides and proteins.

Which of the following serves as an internal energy reserve in plants?

  1. Glucose

  2. Starch

  3. Glycogen

  4. Protein

Show answer
Correct Option: B
Explanation:

Carbohydrates, which are not used immediately, are stored in the form of starch, which serves as an internal energy reserve to be used by plants. 

Which type of energy conversion takes place during photosynthesis?

  1. Solar energy to mechanical energy

  2. Solar energy to chemical energy

  3. Wind energy to chemical energy

  4. Chemical energy to mechanical energy

Show answer
Correct Option: B
Explanation:

During the process of photosynthesis, solar energy is converted into chemical energy and is stored as organic matter.

The first step in the dark reaction of photosynthesis is

  1. formation of ATP

  2. ionisation of water

  3. attachment of CO2 to a pentose sugar

  4. excitement of an electron of chlorophyll by a photon of light

Show answer
Correct Option: C
Explanation:

The first step in the dark reaction of photosynthesis is carboxylation in which one molecule of CO2 combines with one molecule of ribulose 1, 5-biphosphate (RuBP) to form unstable six carbon compounds. Carboxylation of RuBP is catalysed by the enzyme RuBP carboxylase or Rubisco.

Which of the following statements about dark reaction are FALSE?

P. Source of energy for dark reaction is ATP synthesised in light reaction. Q. Raw materials of dark reaction are water, ADP and H3PO4. R. Oxygen is by-product of dark reaction and released to atmosphere. S. Dark reaction occurs in stroma of chloroplast.

  1. Only P and Q

  2. Only P and R

  3. Only P and S

  4. Only Q and R

  5. Only R and S

Show answer
Correct Option: D
Explanation:

Water, ADP and H3PO4 are raw materials for light reaction. Raw materials of dark reaction are CO2, NADPH2 and ATP. Oxygen is the by-product of light reaction and is released in the atmosphere.

Which of the following provide(s) electrons for reduction of CO2 in light reaction of photosynthesis?

  1. Sunlight

  2. Minerals

  3. Water

  4. Soil

Show answer
Correct Option: C
Explanation:

Photolysis of water in photosystem liberates electrons which reduce CO2.

What is the conversion of ADP to ATP using the energy of sunlight called?

  1. Phosphotransfer

  2. Photosynthesis

  3. Photophosphorylation

  4. Oxidative phosphorylation

Show answer
Correct Option: C
Explanation:

Conversion of ADP to ATP using the energy of sunlight is called photophosphorylation.

Which type of light is absorbed the most by plants where maximum photosynthesis takes place?

  1. Red light

  2. Green light

  3. Blue light

  4. Ultraviolet light

Show answer
Correct Option: A
Explanation:

It is the most absorbed light. Maximum photosynthesis occurs in red part. #

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