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Natural sciences

Grade 9

Plants: structure, including genetics

Module 26

Structure of a plant cell

Activity:

To understand the structure of a plant cell

[lo 2.1, 2.2, 2.3, 2.4]

Ask your educator for a leaf from a moss plant, or some other example, to study through a microscope.

You could study the structure of a typical leaf. The following illustration is a simple line drawing providing a two-dimensional image of what you might see:

The cell consists of a framework filled with a special liquid – PROTOPLASM – with a variety of structures floating in it. Some of these are too small to be seen through an ordinary microscope. We need to use an electron microscope to examine these small structures. Remember that you see the cell from one side only. It is actually shaped like a brick and we say that it is three-dimensional. Ask your educator to explain this concept to you.

Find out about microscopes and electron microscopes.

Assignment 1:

1. Provide a caption for the sketch.

2. Add labels in the numbered boxes.

3. What are the functions of each?

LabelNumber Labels
1.
2.
3.
4.
5.
6.
7.
8.

Assignment 2 : The nucleus contains fine details that you need to get to know before working through the rest of the module:

Discuss each of the labels of the nucleus in class and summarise their functions.

Label
1. Nucleole
2. Chromatin network
3. Nuclear membrane
4. Nucleoplasm

Can you remember the main function of the nucleus?

Although the nucleus is the control centre of the cell, there are two other organelles that require closer investigation because of the important functions that they perform.

Plants engage in PHOTOSYNTHESIS and RESPIRATION. The organelles that are involved in this are the CHLOROPLAST (photosynthesis) and the MITOCHONDRION (respiration). You will be learning more about these organelles in future.

Your educator will show detailed sketches of these organelles to introduce them in greater detail.

Assessment: The identification of cellular structure

Were you able to distinguish the basic structures?

[ LO 2.1; LO 2.3]

Assignment 3:

Make simple line drawings of the organelles,

Which of the structures and aspects that form part of the plant cell would you not expect to come across in an animal cell? Supply reasons:

(Suggestion: Look at yourself and at a plant, and feel what you are like and what a plant is like.)

Assessment: Line drawings and deductions

Were you able to do the sketches and make deductions? [LO 2.3; LO 2.4]

By now, you probably understand that plant cells have particular characteristics but that they do not all look the same, because they are adapted to fulfil specific functions. These adaptations in their structure are referred to as DIFFERENTIATION and the accompanying change of function is known as SPECIALISATION . Both terms are important in cellular studies.

A group of cells that are adapted to perform a particular function is called a particular kind of TISSUE . Some conduct water through the plant. Other groups of cells are responsible for strengthening the plant. More, still, are adapted for photosynthesis.

Questions & Answers

what does nano mean?
Anassong Reply
nano basically means 10^(-9). nanometer is a unit to measure length.
Bharti
do you think it's worthwhile in the long term to study the effects and possibilities of nanotechnology on viral treatment?
Damian Reply
absolutely yes
Daniel
how to know photocatalytic properties of tio2 nanoparticles...what to do now
Akash Reply
it is a goid question and i want to know the answer as well
Maciej
characteristics of micro business
Abigail
for teaching engĺish at school how nano technology help us
Anassong
Do somebody tell me a best nano engineering book for beginners?
s. Reply
what is fullerene does it is used to make bukky balls
Devang Reply
are you nano engineer ?
s.
fullerene is a bucky ball aka Carbon 60 molecule. It was name by the architect Fuller. He design the geodesic dome. it resembles a soccer ball.
Tarell
what is the actual application of fullerenes nowadays?
Damian
That is a great question Damian. best way to answer that question is to Google it. there are hundreds of applications for buck minister fullerenes, from medical to aerospace. you can also find plenty of research papers that will give you great detail on the potential applications of fullerenes.
Tarell
what is the Synthesis, properties,and applications of carbon nano chemistry
Abhijith Reply
Mostly, they use nano carbon for electronics and for materials to be strengthened.
Virgil
is Bucky paper clear?
CYNTHIA
so some one know about replacing silicon atom with phosphorous in semiconductors device?
s. Reply
Yeah, it is a pain to say the least. You basically have to heat the substarte up to around 1000 degrees celcius then pass phosphene gas over top of it, which is explosive and toxic by the way, under very low pressure.
Harper
Do you know which machine is used to that process?
s.
how to fabricate graphene ink ?
SUYASH Reply
for screen printed electrodes ?
SUYASH
What is lattice structure?
s. Reply
of graphene you mean?
Ebrahim
or in general
Ebrahim
in general
s.
Graphene has a hexagonal structure
tahir
On having this app for quite a bit time, Haven't realised there's a chat room in it.
Cied
what is biological synthesis of nanoparticles
Sanket Reply
what's the easiest and fastest way to the synthesize AgNP?
Damian Reply
China
Cied
types of nano material
abeetha Reply
I start with an easy one. carbon nanotubes woven into a long filament like a string
Porter
many many of nanotubes
Porter
what is the k.e before it land
Yasmin
what is the function of carbon nanotubes?
Cesar
I'm interested in nanotube
Uday
what is nanomaterials​ and their applications of sensors.
Ramkumar Reply
what is nano technology
Sravani Reply
what is system testing?
AMJAD
preparation of nanomaterial
Victor Reply
how did you get the value of 2000N.What calculations are needed to arrive at it
Smarajit Reply
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Source:  OpenStax, Natural sciences grade 9. OpenStax CNX. Sep 15, 2009 Download for free at http://cnx.org/content/col11069/1.1
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