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Natural sciences

Grade 9

Plants

Module 29

Plant organs: flowers

Flowering plants (Angiosperms) are the most prolific and successful group of plants on earth. Their secret is partly related to the way in which they are propagated. The key to this secret lies in the structure of the flowers and in how they operate. The fact that propagation is SEXUAL , adds to their success.

The flower is a structure that contains both the male and female structures of the plant. Male and female structures do sometimes occur in separate plants, but they mostly occur in a single bisexual (gynandrous) flower.

Activity 1:

To describe flowers as structures for propagation

[lo 2.2, 2.3]

Assignment 1:

1. Take a flower and make a lengthwise cut through it to divide it in two. The Petunia is a good example to use. Make a drawing of the flower, showing all its parts (without labels).

Name the functions of each of the following (find the answers yourself or enlist the educator's help):

Anther:
Filament:
Stigma:
Style:
Ovary:
Seedbud / ovulum:
Petal:
Sepal / calyx-leaf:
Stamen:
Pistil:
Footstalk / peduncle:
  1. Try to identify all the parts listed in no. 2, in your sketch for no. 1.

4. Answer the following questions:

What is the term we use to refer to the group of plants that bear flowers?

Are all types of flowers equally colourful? Provide an explanation.

Are all flowers fragrant? Provide an explanation.

What is the function of all flowers?

Assessment: Sketches

Were you able to distinguish the basic differences?

[LO 2.2; LO 2.3]

Activity 2:

To describe pollination as a necessary process for the propagation of flowering plants

[lo 1.1, 1.2, 13, 2.4]

Pollination is the process by which a mature (ripe) grain of pollen lands on the mature pistil of a similar plant.

Assignment 1:

1. Why must the grain of pollen be mature?

2. Why should the pistil be mature and receptive?

3. Why must the plant that is pollinated be similar to the one from which the pollen is derived?

The pollen of each type of plant has a unique structure and are microscopically different from the pollen of the plants. This means that a grain of pollen has to fit like onto the pistil like a key in a lock.

A ripe grain of pollen will begin to germinate as soon as it has landed on an appropriate surface.

Assignment 2:

Undertake an investigation to obtain information about the pollen and pistils of different kinds of plants.

Assemble a sheet of sketches of the different kinds of pollen and pistils that you discover.

Assessment: Investigation

Were you able to distinguish basic differences?

[LO 1.1; 1.2; 1.3]

Assignment 2:

Design a flower of your own with the help of the following guidelines:

Your flower is of a very rare, exotic type. It grows in the upper reaches of mountains where there are hardly any insects. It has to rely on wind for pollination. The mechanism by which pollination occurs will be the absolute deciding factor for what the flower's structure will be like.

Assessment: Flower design

Were you able to distinguish basic differences?

[LO 2.4]

Activity 3:

To describe fertilisation as a necessary process for the propagation of flowering plants

[lo 2.1, 2.2]

We have mentioned that two main processes during reproduction occur, namely pollination and fertilisation. We know what pollination is, and that the ultimate goal of the grain of pollen is to reach the mature ovule to fertilise it.

Questions & Answers

where we get a research paper on Nano chemistry....?
Maira Reply
what are the products of Nano chemistry?
Maira Reply
There are lots of products of nano chemistry... Like nano coatings.....carbon fiber.. And lots of others..
learn
Even nanotechnology is pretty much all about chemistry... Its the chemistry on quantum or atomic level
learn
Google
da
no nanotechnology is also a part of physics and maths it requires angle formulas and some pressure regarding concepts
Bhagvanji
hey
Giriraj
Preparation and Applications of Nanomaterial for Drug Delivery
Hafiz Reply
revolt
da
Application of nanotechnology in medicine
what is variations in raman spectra for nanomaterials
Jyoti Reply
I only see partial conversation and what's the question here!
Crow Reply
what about nanotechnology for water purification
RAW Reply
please someone correct me if I'm wrong but I think one can use nanoparticles, specially silver nanoparticles for water treatment.
Damian
yes that's correct
Professor
I think
Professor
Nasa has use it in the 60's, copper as water purification in the moon travel.
Alexandre
nanocopper obvius
Alexandre
what is the stm
Brian Reply
is there industrial application of fullrenes. What is the method to prepare fullrene on large scale.?
Rafiq
industrial application...? mmm I think on the medical side as drug carrier, but you should go deeper on your research, I may be wrong
Damian
How we are making nano material?
LITNING Reply
what is a peer
LITNING Reply
What is meant by 'nano scale'?
LITNING Reply
What is STMs full form?
LITNING
scanning tunneling microscope
Sahil
how nano science is used for hydrophobicity
Santosh
Do u think that Graphene and Fullrene fiber can be used to make Air Plane body structure the lightest and strongest. Rafiq
Rafiq
what is differents between GO and RGO?
Mahi
what is simplest way to understand the applications of nano robots used to detect the cancer affected cell of human body.? How this robot is carried to required site of body cell.? what will be the carrier material and how can be detected that correct delivery of drug is done Rafiq
Rafiq
if virus is killing to make ARTIFICIAL DNA OF GRAPHENE FOR KILLED THE VIRUS .THIS IS OUR ASSUMPTION
Anam
analytical skills graphene is prepared to kill any type viruses .
Anam
Any one who tell me about Preparation and application of Nanomaterial for drug Delivery
Hafiz
what is Nano technology ?
Bob Reply
write examples of Nano molecule?
Bob
The nanotechnology is as new science, to scale nanometric
brayan
nanotechnology is the study, desing, synthesis, manipulation and application of materials and functional systems through control of matter at nanoscale
Damian
Is there any normative that regulates the use of silver nanoparticles?
Damian Reply
what king of growth are you checking .?
Renato
What fields keep nano created devices from performing or assimulating ? Magnetic fields ? Are do they assimilate ?
Stoney Reply
why we need to study biomolecules, molecular biology in nanotechnology?
Adin Reply
?
Kyle
yes I'm doing my masters in nanotechnology, we are being studying all these domains as well..
Adin
why?
Adin
what school?
Kyle
biomolecules are e building blocks of every organics and inorganic materials.
Joe
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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