Important Questions for Class 11 Biology 11th Chapter Transport in Plants MCQ, Very Short, Short Type, Long Type
CBSE Class 11 Important Questions for Class 11 Biology Chapter 11 Transport in Plants all MCQ Type, Very Short Type, Assertion Reason Type, Case Study, Short Type and Long Type Questions with Answers by Expert. Important Questions for Section A, B, C, D Class 11 Biology Chapter 11.
- MCQs
1) Elements that are immobilized include________
a.) Calcium
b.) Phosphorus
c.) Sulphur
d.) Nitrogen
2.) Assertion: There is increase in humidity in atmosphere.
Reason: due to increased humidity rate of transpiration will increase.
a.) Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.
b.) Both Assertion and Reason are correct and Reason is not the correct explanation for Assertion.
c.) If assertion is true but the reason is false.
d.) if both assertion and reason are false.
3.) When molecule moves across a membrane independent of other molecules, the,process is called
a) Symport
b) Uniport
c) Antiport
d) Diport
4.) Assertion: The greater the concentration of water in a system, the greater is its kinetic energy or ‘water potential’.
Reason: Hence, it is obvious that pure water will have the greatest water potential.
a.) Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.
b.) Both Assertion and Reason are correct and Reason is not the correct explanation for Assertion.
c.) If assertion is true but the reason is false.
d.) if both assertion and reason are false.
5.) Which is the feature of active transport
a.) Requires ATP
b.) from higher concentration to lower concentration
c.) non- selective
d.) Unsaturated transporter
6.) Assertion: Transport rate reaches a maximum when all of the protein transporters are being used (saturation).
Reason: different proteins in the membrane play a major role in only active transport.
a.) Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.
b.) Both Assertion and Reason are correct and Reason is not the correct explanation for Assertion.
c.) If assertion is true but the reason is false.
d.) if both assertion and reason are false.
7.) Opening and closing of stomata is affected by
a.) light
b.) humidity
c.) carbon dioxide
d.) all the above
8.) Which hormone is involved in stomatal closure?
a.) auxin
b.) abscisic acid
c.) ethylene
d.) gibberellins
9.) Turgor pressure is ______
a.) causes pressure against cell wall
b.) due to hypertonic solution
c.) responsible for plasmolysis
d.) All the above
10.) Assertion: Solute potential is always negative
Reason: When solute is dissolved in pure water, the solution has fewer free water molecules and the concentration (free energy) of water decreases, reducing its water potential.
a.) Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.
b.) Both Assertion and Reason are correct and Reason is not the correct explanation for Assertion.
c.) If assertion is true but the reason is false.
d.) if both assertion and reason are false.
- Answer in one sentence
Q.1 What are the two components of water potential?
Ans. The concept of water potential (Yw) is crucial to comprehending water movement. The two basic components that determine water potential are solute potential (Ys) and pressure potential (Yp).
Q.2) What is guttation?
Ans. Guttation is the loss of water in its liquid state. The excess water collects in the form of droplets around special openings of veins near the tip of grass blades and leaves of many herbaceous parts at night and early morning.
Q.3) How is water transported from roots to leaves?
Ans. Water transported from roots to leaves by the action on transpiration or root pressure etc.
Q.4) What is transpiration?
Ans. Transpiration is the evaporative loss of water by plants through stomata. The stomata also allow for the exchange of oxygen and carbon dioxide in the leaf, in addition to the loss of water vapor.
Q.5) Define: imbibition
Ans. When water is absorbed by solids, colloids and causes them to expand in volume, is known as imbibition process in plants.
Q.6) What is translocation?
Ans. Translocation is the mass transport of chemicals via the conducting or vascular tissues of plants.
Q.7) What is osmosis?
Ans. Osmosis is the movement of solvent molecules from higher concentration to lower concentration through semipermeable membrane.
- Answer in short
Q.1) Why is solute potential always negative?
Ans. a) The water potential of pure water at standard temperatures and pressure is assumed to be zero by convention.
b) When a solute is dissolved in pure water, the solution has fewer free water molecules, lowering the concentration (free energy) of water thus lowering the water potential.
c) As a result, all solutions have a lower water potential than pure water; the magnitude of this reduction owing to solute dissolution is known as solute potential, and it is always negative.
Q.2) Why is the endodermis in root cell impervious to water?
Ans.1.) Because of a band of suberized matrix termed the casparian strip, the inner margin of the cortex, the endodermis, is impermeable to water.
2.) Water molecules are unable to penetrate the layer and they are guided to non-suberized wall areas, and then into the cells themselves via the membranes.
Q.3) Transpiration driven ascent of xylem sap depends mainly on which physical properties of water?
Ans. 1.) Mutual attraction between water molecules is known as cohesion.
2.) Adhesion is the attraction of water molecules to polar surfaces (such as tracheary elements’ surfaces).
3.) Water molecules in the liquid phase are more attracted to each other than water molecules in the gas phase due to surface tension.
Q.4.) Explain why most minerals must enter the root by active absorption into the cytoplasm of epidermal cells.
Ans. 1.) Minerals exist in the soil as charged particles (ions) that cannot cross cell membranes, and their concentration in the soil is often lower than that in the root.
2.) As a result, most minerals must be actively absorbed into the cytoplasm of epidermal cells in order to reach the root.
- Answer in Brief
Q.1) What is symplast? Describe the process in brief.
Ans. 1.) The symplastic system is a network of protoplasts that are linked together.
2.) The cytoplasmic threads of protoplasm that extend through plasmodesmata join neighboring cells.
3.) Water moves through the cytoplasm of the cells during symplastic movement; intercellular movement occurs through the plasmodesmata.
4.) Because water must pass through the cell membrane to enter the cells, the movement is slower. Movement is down a potential gradient once more.
5.) Cytoplasmic streaming may promote symplastic movement.
6.) Cytoplasmic streaming in Hydrilla leaf cells; the movement of chloroplast as a result of streaming is clearly visible.
Q.2) What is osmosis? State its types
Ans. 1.) Osmosis is the transport of water molecules or solvent through a semi-permeable membrane from an area of higher concentration to a area of lower concentration until equilibrium is attained.
2.) There are 2 different types of osmosis:
a.) When a cell is placed in a hypotonic solution, endosmosis occurs, which is the transport of water molecules into the cell.
b.) When a cell is placed in a hypertonic solution, exosmosis occurs, which is the movement of water molecules out of the cell.
Q.3) What is bulk flow in plants?
Ans. 1.) Special long distance transport systems become necessary so as to move substances across long distances and at a much faster rate.
2.) Water and minerals, and food are generally moved by a mass or bulk flow system.
3.) Mass flow is the movement of substances in bulk or from one point to another as a result of pressure differences between the two points.
4.) It is a characteristic of mass flow that substances, whether in solution or in suspension, are swept along at the same pace, as in a flowing river.