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Absorption by Roots - 1

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Which of the following plant structures are responsible for absorption of minerals?

  1. Stomata

  2. Stem

  3. Roots

  4. Leaves


Correct Option: C
Explanation:

Roots are responsible for absorption of minerals.

Which of the following functions is NOT carried out by roots?

  1. Fixation of plant in soil

  2. Producing a suction force through transpiration

  3. Absorption of nitrates

  4. Conduction of absorbed water to the upper parts of the plant


Correct Option: B
Explanation:

Transpiration occurs through stomata, which is absent in roots.

Which of the following is NOT absorbed by the roots?

  1. Nitrate

  2. Sulphate

  3. Phosphate

  4. Carbon dioxide


Correct Option: D
Explanation:

CO2 absorption occurs through stomata, which is absent in roots.

Which of the following is NOT a characteristic of roots for absorbing water?

  1. Huge surface area

  2. Presence of solution at higher concentration than soil water

  3. Presence of pores for inflow of water

  4. Thin wall of root hair


Correct Option: C
Explanation:

Roots do not have pores for absorption of water.

Which of the following form root hair?

  1. Epidermal cells

  2. Guard cells

  3. Mesophyll cells

  4. Xylem vessels


Correct Option: A
Explanation:

Root hairs are extension of epidermal cells.

Which of the following is TRUE for the concentration of vacuoles present in epidermal cells?

  1. It is hypertonic to soil water.

  2. It is hypotonic to soil water.

  3. It is isotonic to soil water.

  4. It is an empty vacuole.


Correct Option: A
Explanation:

Its concentration is higher than soil water.

Which of the following phenomena is responsible for rupturing coats of germinating seeds?

  1. Osmosis

  2. Diffusion

  3. Assimilation

  4. Imbibition


Correct Option: D
Explanation:

Imbibition pressure causing rupture of seed coat is a case of germinating seeds.

What is the process of absorption of water by surface attraction called?

  1. Osmosis

  2. Imbibition

  3. Diffusion

  4. Active transport


Correct Option: B
Explanation:

Imbibition is the process of absorption of water by surface attraction.

What is the process of movement of molecules of a gas from higher concentration to the region of lower concentration called?

  1. Imbibition

  2. Diffusion

  3. Absorption

  4. Osmosis


Correct Option: B
Explanation:

Diffusion is the process of movement of molecule of a gas from higher concentration to region of lower concentration.

Which of the following processes involves a semi-permeable membrane?

  1. Imbibition

  2. Active transport

  3. Osmosis

  4. Sedimentation


Correct Option: C
Explanation:

Osmosis involves movement across a semi-permeable membrane.

Which of the following phenomena leads to swelling of cell?

  1. Phagocytosis

  2. Endomosis

  3. Exosmosis

  4. Plasmolysis


Correct Option: B
Explanation:

Endosmosis is the inward movement of water that swells up the cell.

When a sugar cube is kept in a beaker containing water, it slowly dissolves and spreads in the liquid. Which of the following processes is taking place?

  1. Melting

  2. Absorption

  3. Diffusion

  4. Imbibition


Correct Option: C
Explanation:

Diffusion is taking place in this case.

Which of the following is NOT a semi-permeable membrane?

  1. Cell membrane

  2. Cellophane paper

  3. Muslin cloth

  4. Visking bag


Correct Option: C
Explanation:

Musclin cloth does not act as a semi-permeable membrane as it allows passage of solutes.

If a cell is placed in pure water, which of the following will occur?

  1. Movement of water outside the cell

  2. Movement of water into the cell

  3. No movement

  4. Movement of solutes only


Correct Option: B
Explanation:

Endosmosis will occur with movement of water into the cell across cell membrane.

Which of the following processes allows absorption of nutrients like nitrates, potassium, zinc, etc.?

  1. Endosmosis

  2. Diffusion

  3. Active transport

  4. Imbibition


Correct Option: C
Explanation:

Active transport allows transport of nutrients (like nitrates, potassium, etc.) against the concentration gradient.

Which of the following processes requires energy to take place?

  1. Imbitition

  2. Osmosis

  3. Diffusion

  4. Active transport


Correct Option: D
Explanation:

Active transport requires energy from the cell to take place.

Which of the following takes place in active transport?

  1. Movement of a substance from its lower to higher concentration

  2. Movement of a substance form its higher to lower concentration

  3. Movement of water from its lower to higher concentration

  4. Movement of water from its higher to lower concentration


Correct Option: A
Explanation:

In active transport, a substance (ion or salt) moves from its lower concentration to higher concentration.

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