Download 5 - Bal Bharati Public School

BAL BHARATI PUBLIC SCHOOL
PITAMPURA
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CLASS-6
CHAPTER NO- 7
GETTING TO KNOW ABOUT PLANTS
NOTES
Q1. Differentiate between herbs and shrubs?
Ans. Herbs: Plants with green and tender stemsare called herbs. They are usually
short and may not have many branches. Herbs have short life span. Ex .mustard,
raddish, wheat, ,paddy.
Shrubs :Some plants have the stem branching out near the base. The stem is
hard but not very thick. Such plantsare called shrubs.ex. rose, jasmine, tulsi,
lemon.
Q2. Define tree? Give it's examples?
Ans. Trees are tall and big plants with main thick and woody stem called
trunk.The stem have branches in the upper part, much above the ground.The life
span of tree's is very long. Ex. neem , mango.
Q3. How does creeper plant differ from climber plant? Give examples?
Ans. Creepers: Plants with weakstems that cannot stand upright and spread on
the ground are called creepers. Ex. strawberry and money plant.
Climbers : while those that take support on neighbouring structures and climb
up are called climbers. Ex .pea plant and grape wine.
Q4.Classify the following as herbs , shrubs , trees , crrepers , climbers.
Jasmine , neem , rose , pea plant , money plant , radish
a. Jasmine : shrub
b. neem : tree
c. Rose : shrub
d. Pea plant :climber
e. money plant ; creeper
f. radish : herbs
Q5. What is a root ? What are various functions of it ?
Ans. The part of plant which grows below the ground are called root.Functions of
root are :
1. root anchor the plants to the soil.
2. root absorbs water and minetals from soil.
Q6. Name the two type of roots?
Ans. Roots are of two types:
(a).Tap root : Tap root is a straight tapering root which grows vertically down
and gives lateral roots.tap root is the main root and side roots are called lateral
root.Ex. mango, carrot.
(b). Fibrous root : These plants don't have main root .They have bunch of similar
roots called fibrous root.Ex. wheat , paddy, grass.
tap root
fibrous root
Q7. Define stem. enlist its functions.
Ans. The part of plant which grows vertically up from the ground is called stem.
The stem supports branches and leaves. It is a link between root and rest of
plant.
Functions1. It holds the plant upright.
2. the stem of a plant carries water and minerals from the roots to the leaves and
other parts of plants.
3.the stem carries the prepared food from the leaves to the other parts of plant.
Q8. Explain the structure of leaf?
Ans. The part of a leaf by which it is attached to the stem is called petiole. The
broad, green part of the leaf is called lamina.These lines on the leaf are called
veins. The main vein in the centre of lamina is called the midrib.
Q9. What is venation? discuss it's types?
Ans. The design made by veins in a leaf is called the leaf venation. There are two
main types of venation
Reticulate : If this design is net-like on both sides of midrib, the venation is
reticulate.
Ex. pea plant , neem tree.
Parallel : In the leaves when the veins are parallel to one another called
parallel venation Ex. wheat , paddy , maize
Q10 .What is a relationship between venation and types of root?
Ans. 1.the plants having leaves with reteculate venation have tap roots.
2. the plants having leaves with parallel venation have fibrous roots.
Q11. Write down two functions performed by leaves?
Ans. 1. Photosynthesis:The leaves of a plant contain a green coloured pigment
called chlorophyll .The green leaves make food(starch) in the presence of carbon
dioxide,water and sunlight.
2. Transpiration :The lower surface of leaves contain stomatas which help in get
rid of excess of water and exchange of gases.
Q12. Name the 4 whorls of flower.
Ans. There are 4 whorls of flower:
1. Sepals: The green leaf like part in the outermost circle of flowers is called
sepals.it protects young buds. Sepals may be separate or joint from one another.
2. Petals : petals are the most attractive and colourful part of flower. Petals also
attract insects. Petals may be either separate from one another or joint together.
3. Stamen : It is the male part of the flower. It is made up of two parts : a
filament and anther . Anther contains yel low powder like substance called pollen
grains. There are many stamens in a flower.
4. Pistil (carpel) : It is a female part of flower. It is a flask shaped found in the
centre of ovary.
The pistil is made up of three parts ; stigma, style , ovary. Stigma is very sticky
so that pollen can stick on it. The middle part of pistil is called style which
connects to swollen bottom part called ovary. The ovary contains egg like
structure called ovules.
Que.13. In a flower :
a. What do ovaries become after fertilisation?
ans. Fruit
b. What do ovules become after fertilisation?
ans. Seed.
Q14. A student keep twig in red ink after few hours , he observed red lines in
stem and leaves . Explain what had happened?
Ans. This experiment shows that the stem of the plant carries red coloured water
upwards to the to the leaves and flowers. It is this red coloured water which
producesred lines in the leaves and when the red coloured water reaches the
white petals of the flower,they turn red .Just like red ink ,the minerals dissolved
in water also moves up the stem alongwith water.
Q15. A boy covers a leaf with a polythene bag and leaves it for 24 hours. What
will he observe and why?
Ans. He will observe tiny droplets of water sticking to the inner side of polythene
bag. The leaves of plants gives out water constantly in the form of water vapours
through stomata ( transpiration) .the water vapours given out by covered leaves
keeps on collecting inside the polythene bag and these water vapours get
condensed to form tiny drops of watet. This experiment shows that the leaves of
plants lose water throgh transpiration
Q16. How will you detect the preesence of starch in a given food sample?
Ans. Take a food sample and add few drops of iodine if it turns blue-black shows
the presence of starch
Q17. Why it is difficult to seperate the sprouted young plants from the cotton
wool?
Ans.17 It is difficult to seperate sprouted seeds from cotton wool because roots
have grown up and fixed the seed in the cotton wool just like roots help in holding
or anchor the plant firmly in the soil.
Q 18. Discuss an experiment to show that sunlight is necessary for
photosynthesis.
A 18. 1.The green leaves of plant can be destarched by keeping the plant in
a dark place in a room for 2 to 3 days.
2. Cover a portion of a leaf of the plant competely with black paper and leave the
plant in the sun for a day.
3. Remove the leaf covered in a black paper and pour dilute iodine solution over
the covered part.
4. The part of leaf which was covered with black paper , does not turn blue black
on adding iodine solution showing no starch.
This means that the middle part of leaf which did not get sunlight could not make
starch food by photosynthesis.
Modification of stem
1. Undergroud stems of potato and ginger are modified to store food.
2. Some stems are modified into tendrils which are slender and spirally coiled
and help plants to climb such as in gourds and grapewine.
Leaf modifications
1. The fleshy leaves of onion and garlic store food.
2. leaves of pea plant are modified into tendrils for climbing.
Root modification ;
Roots in certain plants change their shape and become modified to perform
function other than absorption and conduction of water and minerals
1. Roots are modified to store food Ex. carrot , turnip.
2. Prop roots in banyan tree are modified to support.