interactive questions 05 1

7/25/2019 Interactive Questions 05 1

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INTERACTIVE

MULTIPLE-CHOICE

QUESTIONS

Flowering Plants

The answers are ro!i"e"#

E$lanations o% wh& the alternati!esare 'nsatis%a(tor& are also o%%ere"


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These multiple choice questions are similar to the ones set

by the GCSE and IGCSE Examination Boards except that,in some cases, there may be more than one acceptable

answer.

For this reason, een i! you select a correct answer at your!irst attempt, it is worth loo"in# at all the alternaties

$a% to see i! there is a better answer and

$b% to see why some o! the alternaties are

unacceptable&uestion '


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&uestion '

In a !lowerin# plant, thespongy mesophyllis to be !ound in (

$a% the roots

$b% the stem

$c% the lea!

$d% the !ruit

&uestion )


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*o


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*o


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palisade

mesophyll

spongy

mesophyll

Vertical section through leaf

1mm

+es


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*o


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&uestion )

In a !lowerin# plant, su#ars are transported (

$a% upwards in the xylem

$a% upwards in the phloem

$c% upwards or downwards in the phloem

$d% upwards or downwards in the xylem

&uestion


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*o

-ater and mineral ions are transported in the xylem

but not su#ars


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+esand*o

Su#ars aretransported in the phloem but not exclusiely

in an upward direction


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+es

Su#ars are transported in the phloem. The direction may

be upwards, e.#. !rom the leaes to the #rowin# point or

the !ruits, or downwards, e.#. !rom the leaes to the

roots or stora#e or#ans.


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*o

-ater and mineral ions are transported in the xylem

but not su#ars


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&uestion

The root o! a !lowerin# plant absorbs water and mineral

ions mainly throu#h (

$d% the xylem

$c% the phloem

$b% the root hairs

$a% the epidermis

&uestion


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The epidermis is lar#ely impermeable except in the

re#ion where root hairs deelop

*o


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Transverse section

through a root

root hair

epidermis

phloem

xylem

0.05mm

Root hair cell

root hair

+es

The root hairs are

extensions !rom some o!

the epidermal cells.They hae ery thin cell

walls and absorb water

and mineral ions.


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*o

The phloem conducts su#ars and amino acids to the

root but is not inoled in the upta"e o! water


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*o

The xylem carries water !rom the root to the rest o!

the plant but it is not the structure inoled in the

entry o! water


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&uestion

The !orce responsible !or water traellin# up a tree is

#enerated mainly by (

$d% osmosis

$c% actie transport

$b% root pressure

$a% eaporation !rom the leaes

&uestion /


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+es

Eaporation o! water !rom the

leaes creates a tension which

draws water up the trun"

evaporation


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*o

0oot pressure can !orce water some distance up the

trun" but is insu!!icient to ta"e it all the way


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*o

1ctie transport enables the roots to ta"e up dissoled

substances a#ainst a di!!usion #radient. It is not

responsible !or the !low o! water up the trun"


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*o

2smosis #enerates root pressure but this is

insu!!icient to !orce water all the way up the trun"


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&uestion /

-hich o! the !ollowin# are the reproductie or#ans

o! a !lowerin# plant3

$d% Stamens and oary

$a% 4etals and sepals

$b% Style and sti#ma

$c% 4ollen nucleus and e## cell

&uestion 5


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*o

The sepals protect the !lower when it is in bud. The colour

and scent o! the petals $in insect6pollinated plants% attract

insects which pollinate the !lower


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*o

The style and sti#ma are attached to the oary and play a

part in the trans!er o! the pollen nucleus to the e## cell in

the oule


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The pollen nucleus and the e## cell are thegametes. The

pollen nucleus is the male #ameteand the e## cell is the

!emale #amete

*o


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+es petal

sepal

stamen

ovary

style and

stigma

Stamens are the male

or#ans and the oary

is the !emale or#an

Flower structure of Stitchwort


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&uestion 5

The seeds in this !ruit will be

dispersed by (

$d% animals

$c% wind

$b% water

$a% an explosie method

&uestion 7


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+es

The pod $!ruit% wall dries out,

splits and curls bac" suddenly,

!lic"in# out the seeds.

Examples are #orse and lupin


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*o

I! the seeds landed in a stream they mi#ht be

dispersed by the current, proided they did not sin",

but they are not adapted !or water dispersal


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*o

The seeds are smooth with no !eathery or !lu!!y

structures which would be expected !or wind dispersal.

1lso they are too heay


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*o

Seeds dispersed by mammals hae tiny hoo"s which

catch in the animal8s !ur. Sometimes the hoo"s are on

the !ruit, and the seeds !all out as the animal moes

about.

Seeds dispersed by birds are usually contained in anedible !ruit.


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&uestion 7

-hich o! the !ollowin# statements is the most accurate3

In order to #erminate most seeds need(

$c% water, oxy#en and a suitable temperature

$b% water, oxy#en, nitrates, and a suitable

temperature

$a% water, carbon dioxide, sunli#ht and a suitable

temperature

$d% water, oxy#en and li#ht

&uestion 9


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*o

Carbon dioxide and sunli#ht are not needed !or

#ermination but they will be needed when photosynthesis

be#ins in the seedlin#.


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*o

*itrates are not needed !or #ermination, but they will

be when the seedlin# #rows and starts to ma"e amino

acids and proteins


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+es

:ost seeds need only these three conditions althou#h some

seeds need to under#o a period o! low temperature be!ore

they will #erminate.


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It depends

:ost seeds do not need li#ht to #erminate but a !ew do.

e.#. some species o! lettuce.These seeds need a li#ht

stimulus only in order to #et started. 2nce #ermination

has be#un, li#ht is not needed


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&uestion 9

The drawin# shows a beanseed #erminatin#. -hich o!

the structures is the

hypocotyl

!

"#

#

"

!

&uestion ;


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*o

This is the cotyledonbein# withdrawn !rom the testa


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+es

The hypocotylis the part o! the stem below the

cotyledons


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*o

This is a lateral root


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&uestion ;

1 #roup o! plants deried by e#etatie reproduction !rom a

sin#le parent is called(

$b% a colony

$c% a clone

$d% a community

$a% a population


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*o

1populationis made up o! all the members o! the

same species in a habitat. It does not matter whether

they are deried sexually or asexually.


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*o

The plants may well !orm a colonybut this could be

produced !rom seed as well as e#etatiely


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+es

1ny population o! or#anisms deried asexually !rom a

sin#le parent is called a clone. The or#anisms will be

#enetically identical.


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*o

1 communityconsists o! all the liin# or#anisms

occupyin# the same habitat


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