Plant Nutrition and Tests Quiz

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What color indicates a positive Biuret test for proteins?

Blue

Purple (correct)

Green

Yellow

What is the purpose of the Fehling test?

Identify the absence of chlorophyll

Detect the presence of proteins

Determine the levels of microelements

Detect the presence of reducing sugars (correct)

What result would indicate a negative result in the Fehling test?

Brown color

Clear solution

Brick red precipitate

Blue solution (correct)

Which microelement is involved in chlorophyll formation?

Iron Signup and view all the answers

How do microelements like iron and manganese contribute to plant productivity?

They improve enzyme activity and chlorophyll formation Signup and view all the answers

What is the primary function of nitrogen in plant growth?

It is crucial for amino acid synthesis. Signup and view all the answers

Which mineral is essential for the production of energy molecules like ATP and GTP in plants?

Phosphate Signup and view all the answers

What indicates a deficiency of potassium in plants?

Yellowish/green color of leaves Signup and view all the answers

What is one of the roles of magnesium in plants?

It is a component of chlorophyll. Signup and view all the answers

What effect does growing plants in nitrogen-deficient media have?

Poor overall growth Signup and view all the answers

What color indicates a positive result for the presence of starch in the iodine test?

Dark blue Signup and view all the answers

What observable change occurs in limewater to confirm the presence of carbon dioxide?

It turns turbid (cloudy) Signup and view all the answers

What phenomenon occurs when heating water in a closed test tube?

Appearance of water droplets inside the tube Signup and view all the answers

What does the black precipitate formed after heating plants represent?

Carbon content from burned organic matter Signup and view all the answers

What is the expected color change in an iodine test if starch is absent?

Yellowish brown Signup and view all the answers

What is the primary purpose of photosynthesis?

To synthesize organic matter from inorganic matter Signup and view all the answers

What color indicates the presence of starch when iodine is applied to a leaf?

Dark blue Signup and view all the answers

Which step is NOT part of the procedure to detect starch in green leaves?

Heating the leaves in water Signup and view all the answers

What hypothesis can be drawn regarding light and starch production?

Light is essential for starch production Signup and view all the answers

Which of the following is a product of photosynthesis?

Sugars Signup and view all the answers

What is the primary role of chloroplasts in plant cells?

Site of photosynthesis Signup and view all the answers

Which of the following best describes plastids?

Hollow sacs surrounded by a double membrane Signup and view all the answers

What is the primary function of chromoplasts?

Synthesis and storage of pigments Signup and view all the answers

In which part of the plant does photosynthesis predominantly occur?

Leaves containing chloroplasts Signup and view all the answers

What distinguishes leucoplasts from other types of plastids?

They lack pigment and are used for storage Signup and view all the answers

What is the primary function of chloroplasts in plants?

Site of photosynthesis Signup and view all the answers

Which type of pigment is specifically stored inside plastids and is used in photosynthesis?

Plastidic pigments Signup and view all the answers

What is the name of the fluid found inside chloroplasts?

Stroma Signup and view all the answers

What are the stacked structures inside chloroplasts called?

Grana Signup and view all the answers

Which of the following statements about pigments is incorrect?

Chlorophyll is a vacuolar pigment. Signup and view all the answers

What color indicates the presence of CO₂ in the medium when using Cresol Red?

Yellow Signup and view all the answers

Which indicator can be used to determine the absence of CO₂ in a medium?

Cresol Red Signup and view all the answers

What does a yellow color in Cresol Red indicate about a plant's activity?

Respiration is occurring Signup and view all the answers

In what type of medium will Cresol Red appear red?

Alkaline medium Signup and view all the answers

Which statement is true regarding the indicators used for gas exchange in plants?

Cresol Red indicates photosynthesis only when it turns yellow. Signup and view all the answers

Where does the light reaction of photosynthesis occur?

Thylakoid Signup and view all the answers

What is the main product of the dark reaction during photosynthesis?

Glucose Signup and view all the answers

During photosynthesis, which gas is absorbed by plants?

Carbon dioxide Signup and view all the answers

What occurs primarily during the light reactions of photosynthesis?

Conversion of light energy into ATP Signup and view all the answers

What is the overall chemical equation for photosynthesis?

6CO_2 + 6H_2O ightarrow C_6H_{12}O_6 + 6O_2 Signup and view all the answers

What action should be taken to confirm the presence of oxygen using a match?

Partially light a match and bring it near the test subject Signup and view all the answers

Which combination of constants and variables is correct for Experiments A and B?

Variables: Presence or absence of light; Constants: Water, sodium bicarbonate, some plant Signup and view all the answers

Why is the control experiment A important in the context of the experiments?

It serves as a baseline for comparison against the other experiments Signup and view all the answers

What hypothesis is supported by the results of Experiment A and B?

Plants do not produce oxygen in the absence of light Signup and view all the answers

What is the critical variable in Experiment A and C that influences the production of oxygen?

Presence or absence of sodium bicarbonate Signup and view all the answers