MCQ 1_2B Osmosis & Diffusion

Marking Guide

1.	A plant cell, which was placed in a liquid, lost water by osmosis. When compared to the liquid, the cell contents are described as being
	A.	plasmolysed
	B.	hypertonic
	C.	hypotonic
	D.	flaccid

 

2.	The diagram below shows the initial diameter of a potato disc. The potato disc was placed in a hypertonic solution for one hour. Which of the diagrams below correctly shows the change in the diameter of the disc?
	A.			B.
	C.			D.

3.	When animal cells are placed in a hypertonic solution they
	A.	shrink
	B.	burst
	C.	become turgid
	D.	become plasmolysed

4.	Which structural feature is common to both plant and animal cells?
	A.	Cell wall
	B.	Chloroplast
	C.	Cell membrane
	D.	Large central vacuole

5.	What does a plant cell contain that an animal cell does not?
	A.	cytoplasm
	B.	nucelus
	C.	large vacuole
	D.	cell membrane

6.	Both animal and plant cells usually have a
	A.	nucleus, cell membrane and cytoplasm
	B.	nucleus, cell wall and chloroplasts
	C.	nucleus, vacuole and cell wall
	D.	nucleus, cell wall and cytoplasm

7.	An important feature of the nucleus is that it
	A.	is full of water
	B.	has a round shape
	C.	contains information
	D.	makes a thin barrier

8.	Red blood cells burst when they are placed in water because
	A.	the cell contents are hypotonic to the water
	B.	the cell contents are isotonic to the water
	C.	the water is hypotonic to the cell contents
	D.	the water is hypertonic to the cell contents

9.	Which term best describes how water enters and leaves cells?
	A.	diffusion
	B.	osmosis
	C.	evaporation
	D.	permeation

10.	Which statement best describes a selectively permeable membrane?
	A.	it lets all substances through
	B.	it does not let substances through
	C.	it is equally permeable to all substances
	D.	it lets some substances through but not others

11.	A 5% sugar solution contains
	A.	5% water and 95% sugar
	B.	5% sugar and 95% water
	C.	95% water and 95% sugar
	D.	5% water and 5% sugar

Three plant cells P, Q and R are found on a microscope slide.

Cell P is hypotonic to cell Q.
Cell R is hypertonic to cell Q.

12.	Which cell has the highest water concentration?
	A.	P
	B.	Q
	C.	R
	D.	They all have the same water concentration

13.	Which of the following best explains why red blood cells burst when they are placed in water?
	A.	water enters the cell by osmosis, from a low water concentration to a higher water concentration inside the cell
	B.	water leaves the cell by osmosis, from a high water concentration to a lower water concentration outside the cell
	C.	water enters the cell by osmosis, from a high water concentration to a lower water concentration inside the cell
	D.	water leaves the cell by osmosis, from a high water concentration to a lower water concentration outside the cell

14.	A sample of red blood cells were place in a solution of unknown concentration. After 20 minutes, the cells were examined under the microscope.Of 400 cells examined, 160 had burst.From this experiment, what percentage of the red blood cells were hypertonic to the solution they were placed in?
	A.	40%
	B.	60%
	C.	154%
	D.	250%

Choose letter A, B, C or D from the following diagram to answer questions 15 and 16 below.
The diagram shows the ways in which molecules may move into or out of an animal cell.

15.	Which of the molecules could represent the movement of carbon dioxide?
	A.	A		B.	B		C.	C		D.	D

16.	Which of the molecules could represent the movement of oxygen?
	A.	A		B.	B		C.	C		D.	D

17.	Stentor is a single-celled organism living in freshwater ponds. It gains water by osmosis, which is removed by contractile vacuoles, which gradually fill and are then emptied by the Stentor.In an experiment, Stentor were placed in solutions of increasing salt concentration. The contractile vacuoles were found to empty less often.The best explanation for this observation is
	A.	less water is entering the Stentor
	B.	less salt is entering the Stentor
	C.	the salt has poisoned the Stentor
	D.	salt blocks the pores in the cell membrane

18.	The cell membrane contains
	A.	cellulose and protein
	B.	phospholipids and cellulose
	C.	phospholipids and proteins
	D.	proteins, phospholipids and cellulose

19.	A student was studying the responses of cells to solutions of varying salt concentrations. Which solution below would cause no change in cell size?
	A.			B.
	C.			D.