Absorption of Water

Q.

What is the difference between active absorption and passive absorption?

Q.

How do living things get their food.

Q.

The correct sequence of radial movement of water in root is:

1. Epidermis $\to$ Cortex $\to$ Pericycle $\to$ Endodermis $\to$ Xylem

2. Soil water $\to$ Root hair $\to$ Epidermis $\to$ Pericycle $\to$ Endodermis $\to$ Xylem

3. Soil water $\to$ Root hair $\to$ Cortex $\to$ Endodermis $\to$ Pericycle $\to$ Xylem

4. Root hair $\to$ Cortex $\to$ Pericycle $\to$ Phloem $\to$ Xylem

Q.

How does the transportation of food and other substances occur in plants?

Q.

Assertion (A): Active transport is uphill transport.

Reason (R): Active transport uses energy to pump molecules against its concentration gradient.

Choose the correct option.

1. Both A & R are true and R explains A

2. A is true and R is false

3. Both A & R are true and R doesn't explain A

4. Both A & R are false

Q.

How is root pressure linked to guttation?

Q.

Define root pressure. How is it associated with the ascent of sap?

Q.

Describe an experiment to demonstrate the path of the ascent of sap through the xylem.

Q. Explain Ascent of Sap.(5 marks)

Q.

Name the following:

Positive pressure developed in the xylem channels due to metabolic activity of root.

Q.

Root cap has no role in water absorption because:

1. it has no direct connection with vascular system

2. it has no cells contaning chloroplasts

3. it has no root hairs

4. it has loosely arranged cells

Q.

Wilting of the plant occurs when

1. phloem is blocked
   

2. xylem is blocked
   

3. both xylem and phloem are blocked
   

4. a few old roots are removed

Q.

From the diagram given below, choose the most appropriate option.

1. A = Xylem, B = pericycle, C = Protoxylem

2. A = Xylem, B = pericycle, C = Cortex

3. A = Phloem, B = pericycle, C = Cortex

4. A = Phloem, B = Endodermis, C = Cortex

Q.

The path of water and solutes from the soil to the conducting tissue of the root is

1. soil→root hair→cortex→pericycle→endodermis→protoxylem→metaxylem

2. soil→epidermal cell of the rootcortex→ endodermis → pericycle → protoxylem→ metaxylem →secondary xylem

3. soil→ root hair→cortex→endodermis→pericycle→ protoxylem→metaxylem

4. soil→root hair→cortex→endodermis→pericycle→protoxylem→phloem

Q.

Give the biological/technical term for the following:

The process of uptake of mineral ions against a concentration gradient using energy from the cell.

Q. Name the process by which root hairs absorb water from the soil.

Q.

What is meant by cell sap ?

Q.

Many transplanted plants do not survive due to

1. They do not like new soil

2. They do not get required mineral soil.

3. Most of the root hairs are lost during transplantation

4. Leaves get damaged

Q. Assertion :Most minerals must enter the root by active absorption into the cytoplasm of epidermal cells. Reason: This transportation needs energy in the form of ATP. Some ions also move into the epidermal cells passively.

1. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
2. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
3. Assertion is correct but Reason is incorrect
4. Both Assertion and Reason are incorrect

Q. factors affecting the absorption of water by roots from the soil

Q.

Which among these conduct water and minerals from root?

1. B

2. A

3. Both A and B

Q. Mark the incorrect statement regarding the image shown below.

1. Part 2 - Soil particles, Part 3 - Xylem
2. The solution outside the cell has a lower solute concentration than the fluids inside the cell.
3. Part 2 - Cortical cells, Part 4 - Xylem
4. Root pressure is responsible for the inward movement of water as shown.

Q.

What is the importance of nutrients for 1, 2&3marks

Why are green plants called producers

Q.

The stimulus of touch is conveyed in a sensitive plant by ______ means.

1. Electrical

2. Chemical

3. Specialized proteins

4. Electro-chemical

Q.

What are the openings present on the margins of leaves, especially in places which are humid throughout the year, called?

Enter 1 word only.

Q. Water absorption by root hairs occurs until

1. Concentration of water in the cell sap is higher
2. salt concentration in soil is higher.
3. water potential is lower
4. they are separated from soil by a selectively permeable membrane

Q.

The pressure developed in tracheary elements of the xylem due to the metabolic activity of roots is called

1. O.P.

2. T.P.

3. Root Pressure

4. Atmospheric pressure

Q. Water absorbed by the roots reaches the leaves and is used in producing food for the entire plant.

1. True
2. False

Q. Which of the following factors affect the absorption of water by roots?

1. Soil aeration
2. Relative humidity of the atmosphere
3. All of the above
4. Soil temperature

Q.

Why is the stem of hydrometer made thin?