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Adaptations : Cactus Plants

hello friends

my name is bertie and today

we are going to learn about the cactus

plant which is one of the lone survivors

of heat introduction to cacti we have

all heard of this strange plant called

as cactus

a cactus is a kind of plant which is

adapted to living in

very hot and dry weather conditions

these types of plants are called as

xerophytes

you might have noticed how i've written

cacti instead of cactus

that is no mistake cactus is the plural

form

of the word cacti there are over

2 000 species of cactus did you know

that

habitat of a cacti where do cactus live

of course they live in deserts or at

least most of them live naturally in

deserts

not deserts which you eat deserts are

extremely hot places and they do not

have a lot of water but

occasionally there are small pools and

some vegetation around them

these are called as oasis even if the

area is

boiling hot in the day it is chilling

cold at night

this extreme climate is because of the

absence of clouds

which cannot form without water

how do cacti survive it must be really

difficult to live in such a climatic

condition

and yes it is that's why the cactus have

adapted

what do i mean by the adaptation of

cactus

well these plants have shown some change

in their structure to help them to be

better suited to their surrounding

environment

let's have a look at what are the

different features of a cactus plant

adaptation stems the outer skin of the

stem

is thick and waxy so that the plant does

not end up losing

precious water to evaporation

large and fleshy stems help the cactus

to store water

adaptation roots cat tie have two types

of roots

they are long and shallow roots which

spread over a huge surface for any sign

of water

and deep roots for groundwater

it's question time do cacti perform the

process of photosynthesis

and where are the leaves of this plant

well i found out the answers

so here they are yes indeed cacti

performed the process of photosynthesis

with their stems

that's why the stems are green because

they have chlorophyll inside them

but it will be wrong to say that they do

not have leaves at all

so let's have a look at where those

leaves have gone

adaptation leaves leaves of the cacti

are changed completely to form

spines that's right those spiky parts

are really the leaves

so it won't be wrong if i write it like

that

why there are two reasons firstly these

spines can stop

any thirsty animal from chewing off all

that precious water

in that stem it doesn't mean to say that

the animals haven't adapted so that they

can bigger the spines but that's a whole

different topic

let's have a look at the second reason

transpiration the cactus is enemy

transpiration is the process by which

the water leaves the leaf through this

tomato

assume in the form of water vapor which

is a gas

but that means loss of water for the

cacti which it cannot allow

that's why it requires to minimize the

total surface area of the leaf

so that the water cannot escape and the

spines

do precisely that as they do not have

a lot of total surface area you can see

that for yourself

in the two diagrams given above where

the one on the right is a magnified

image of a spine and the one on the left

is that of a normal leaf

it's quiz time fill in the blanks the

leaves of a cactus plant are modified

into dash

there are dash types of roots of a

cactus

the small pools with some vegetation

around them which are located in deserts

are called as dash

let's have a look at the solutions the

leave of a cactus plant are

modified into spines there are two types

of roots of a cactus

the small pools with some vegetation

around them which are located in deserts

are called as

oasis

select the correct option what are the

modified leaves of the cactus called

a thorns b spines

see the leaves are not modified

got your answer that's great let's have

a look at the solution

spines are the modified leaves of the

cactus

the two types of fruits of the cactus

are

blue and red porous and non-porous

shallow and deep

let's have a look at the answer this is

a really easy one

shallow and deep

the outer stem of cactus are dashed to

avoid losing

precious water a thick and waxy

b wet and porous c thin and hard

well the answer is thin and hard

right no oh um

then how about chicken waxy

that's right thank you for watching this

video

if you have any questions or suggestions

don't hesitate to put it down in the

comment box

also if you want to check out any nice

adaptations of animals

you can click on the i button for a

playlist

until the next session bye