Vidaara.orgClass 11 · Mathematics
CodeVID-M11-WS
Transport in Plants — Practice Worksheet
Name: ____________________
Roll No.: __________
Date: ____________
General Instructions
- All questions are compulsory.
- Choose the correct option (A, B, C or D) for each question.
- The answer key is at the end — try the paper first!
Section A — Multiple Choice (1 mark each)
15 × 1 = 15 marks
1.
Movement of molecules from higher to lower concentration without energy is:
- A.Active transport
- B.Diffusion
- C.Translocation
- D.Transpiration
2.
Osmosis is the movement of water across a:
- A.Thick wall
- B.Semi-permeable membrane
- C.Xylem vessel only
- D.Stoma
3.
Pure water has a water potential of:
- A.Highly negative
- B.Zero (the highest)
- C.Always positive and large
- D.Undefined
4.
A plant cell in a hypertonic solution undergoes:
- A.Turgidity
- B.Plasmolysis
- C.No change
- D.Cell division
5.
Transport that uses ATP to move substances against the gradient is:
- A.Diffusion
- B.Osmosis
- C.Active transport
- D.Facilitated diffusion
6.
Water and minerals are mainly absorbed by:
- A.Leaves
- B.Root hairs
- C.Stomata
- D.Flowers
7.
Water rises from roots to leaves through the:
- A.Phloem
- B.Xylem
- C.Cortex
- D.Epidermis
8.
The main force for the ascent of sap in tall trees is:
- A.Root pressure alone
- B.Transpiration pull
- C.Gravity
- D.Wind
9.
Most transpiration takes place through the:
- A.Lenticels
- B.Stomata
- C.Roots
- D.Bark
10.
Stomatal opening and closing is controlled by:
- A.Guard cells
- B.Root hairs
- C.Xylem vessels
- D.Sieve tubes
11.
Besides water loss, transpiration also:
- A.Stops photosynthesis
- B.Cools the plant
- C.Blocks the xylem
- D.Makes food
12.
Transport of food in plants is called:
- A.Transpiration
- B.Translocation
- C.Osmosis
- D.Diffusion
13.
Food is translocated mainly as:
- A.Glucose
- B.Sucrose
- C.Starch
- D.Cellulose
14.
Unlike the xylem, the phloem can transport food:
- A.Only upward
- B.Only downward
- C.In any direction (source to sink)
- D.Not at all
15.
The accepted mechanism of phloem transport is the:
- A.Cohesion–tension theory
- B.Pressure-flow hypothesis
- C.Lock-and-key model
- D.Five-kingdom system
Section B — Challenge / Olympiad (2 marks each)
6 × 2 = 12 marks
16.
If a cell's water potential is more negative than its surroundings, water will:
- A.Enter the cell
- B.Leave the cell
- C.Not move
- D.Freeze
17.
Wilting of a plant on a hot day happens because the rate of transpiration:
- A.Exceeds the rate of water absorption
- B.Is less than absorption
- C.Is zero
- D.Equals photosynthesis
18.
A continuous, unbroken water column in the xylem is maintained by:
- A.Cohesion between water molecules
- B.Active transport
- C.Gravity
- D.Phloem loading
19.
A storage root that is filling with sugar acts as a ____, but when it sprouts it acts as a ____.
- A.Sink; source
- B.Source; sink
- C.Sink; sink
- D.Source; source
20.
Translocation in the phloem is an active process mainly because:
- A.Loading sugar at the source requires energy
- B.Water moves down a gradient
- C.It uses transpiration pull
- D.It needs no membranes
21.
Ringing (removing a ring of bark including phloem) causes the bark above the ring to swell because:
- A.Sugars accumulate above the cut as downward transport is blocked
- B.Water stops rising
- C.The xylem is removed
- D.Stomata close
Answer Key
Section A — Multiple Choice (1 mark each)
- (B) Diffusion
- (B) Semi-permeable membrane
- (B) Zero (the highest)
- (B) Plasmolysis
- (C) Active transport
- (B) Root hairs
- (B) Xylem
- (B) Transpiration pull
- (B) Stomata
- (A) Guard cells
- (B) Cools the plant
- (B) Translocation
- (B) Sucrose
- (C) In any direction (source to sink)
- (B) Pressure-flow hypothesis
Section B — Challenge / Olympiad (2 marks each)
- (A) Enter the cell
- (A) Exceeds the rate of water absorption
- (A) Cohesion between water molecules
- (A) Sink; source
- (A) Loading sugar at the source requires energy
- (A) Sugars accumulate above the cut as downward transport is blocked
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