REVISION PPT FOR SA- II

CLASS VI

PLANT WORLD

PREPARED BY:

VIKRANT V. PURANDARE

1] NAME THE FOLLOWING :

i) An example of non-flowering plant.

- Fern, mosses

ii) The roots that arises from the thin stem in maize plant to provide extra support.

- Stilt roots

iii) The male reproductive part of a flower.

-Stamens

iv) The upper part of the pedicle.

-Thalamus

v) Transfer of pollen grains from the anther to the stigma of flower.

- Pollination

2] DISTINGUISH :

Herbs Shrubs

Short plants with height less than 1 m Medium-sized plants with

height around 1-3 m

Green and tender stem, have a few

branches

Hard and woody stem, not

very thick

No branching or sparse Branches arises from the

base of the stem, bushy

appearance

Ex. Mint, tomato and spinach Ex. Rose, lemon and hibiscus

B) CREEPERS AND CLIMBERS:

Creepers Climbers

The stem of a plant is weak

and is not upright. It may

spread or trail on the ground

The stem of a plant is weak.

Weak stem take the support

of their surrounding

structures such as trees,

walls and railings and climb

up.

Ex. Pumpkin, water-melon Ex. Money plant, pea plant

Node Internode

• A point on the stem where a leaf,

branch or bud arises.

• The portion of stem between two

nodes and internode.

c) Node and internode:

D) SELF POLLINATION AND CROSS POLLINATION

Self pollination Cross pollination

• When the pollens reach

the stigma of the same

flower or another flower

of the same plant.

• When the pollens reach

the stigma of a flower

on another plant.

3] DEFINE THE FOLLOWING:

a) Photosynthesis:

The process in which plants use carbon dioxide and water to prepare food in the presence of sunlight and chlorophyll

b) Transpiration:

Loss of water from the aerial parts of the plant in the form of vapour

4] Identify the type of venation and the type of root system it possess.

- [A] Parallel venation, Fibrous root

- [B] Reticulate venation, Tap root

5] IDENTIFY THE MODIFICATIONS GIVEN IN THE FOLLOWING FIGURES.

WHY?

- (Pitcher plant) Modification of leaves

- To fulfill the need of nitrogen

-(sweet potato) Modification of roots

- Food storage , also known as edible roots

-(GRAPE VINE) MODIFICATION OF

STEMS

- (Tendrils)Provide support to the weak

stems

- (Maize plant) modification of roots

- (Stilt roots)To support the thin

(weak) stem

- (Banyan tree) modification of roots

- (Prop roots) To support a weak stem

or heavy branches

3) THE STEM CARRIES THE PREPARED FOOD FROM THE LEAVES TO OTHER PARTS OF THE PLANT.

1) THE STEM HOLDS THE PLANT UPRIGHT.

6] MENTION THE FUNCTIONS OF STEM.

2) THE STEM OF A PLANT CARRIES WATER AND MINERALS FROM THE ROOTS TO THE LEAVES.

7) WHAT IS VENATION? EXPLAIN THE TWO TYPES OF VENATION.

- THE PATTERN OF ARRANGEMENT OF VEINS ON THE LEAF / LAMINA IS CALLED VENATION.

- THE TWO TYPES OF VENATION ARE: 1) PARALLEL VENATION ,2) RETICULATE VENATION

1) PARALLEL VENATION: THE PATTERN OF VEINS WHERE THE VEINS RUN PARALLEL TO EACH OTHER FROM THE PETIOLE TO THE TIP OF A LEAF. EXAMPLE: GRASSES, BANANA LEAF.

2) RETICULATE VENATION: THE PATTERN OF VEINS WHERE SMALL VEINLETSARISE FROM THE MAIN VEIN OF A LEAF.EXAMPLE: MANGO LEAF, HIBISCUS LEAF.

8) NAME THE PRODUCT OF PHOTOSYNTHESIS.

- THE MAJOR PRODUCT OF PHOTOSYNTHESIS ARE :1) GLUCOSE / FOOD2) OXYGEN

9) WHAT IS THE FUNCTION OF STOMATA?

- STOMATA HELPS IN EXCHANGE OF GASES DURING PHOTOSYNTHESIS.

10) FLOWERS ARE BRIGHTLY COLORED AND HAVE FRAGRANCE. GIVE REASON.

- TO ATTRACT POLLINATORS SUCH AS INSECTS AND BIRDS.

11) WHAT IS TRANSPIRATION?

- TRANSPIRATION IS THE LOSS OF WATER IN THE FORM OF VAPOURS FROM THE AERIAL PARTS OF THE PLANT.

12) HOW DOES THE PROCESS OF TRANSPIRATION HELP THE PLANT?

- THIS HELPS IN KEEPING THE PLANT COOL.

6] DRAW A NEAT LABELED DIAGRAM OF A LEAF.

Vein

Petiole Midrib

Lamina

7] What are the main functions of stem?

• It keeps the plant upright.

• It helps in transportation of water, minerals and food to all other plant parts .

8] Stem prepares food in cactus instead of leaves.

• Due to scarcity of water in desert, the leaves are modified into spines to prevent the loss of

water through them and stem is modified to take over the function of making food.

IDENTIFY AND DEFINE THE ROOT SYSTEM GIVEN BELOW:

-TAP ROOT

- WHEN THE RADICLE GROWS

INTO A THICK PRIMARY ROOT

VERTICALLY DOWNWARD AND

GIVES OF SMALL LATERAL

ROOTS

- FIBROUS ROOT

- THE RADICLE IS

SHORT LIVED AND

MANY ROOTS ARE

ARISES AS A TUFT

FROM THE BASE OF

THE STEM

LABEL THE PARTS IN THE GIVEN DIAGRAM

FILAMENT

ANTHER

STIGMA

STYLE

OVARY

SEPAL

THALAMUS

PETAL

OVULE

THANK YOU