Biology/Life Sciences Class Notes: Reproduction In Plants- Part 1
13 views 0 purchase
Course
Life Sciences
Institution
12th Grade
In-depth class notes on Reproduction In Plants (Part 1 out of 2) in accordance to the Grade 12 (IEB - SAGS document) syllabus
Covers the following areas: Asexual Reproduction (vegetative propagation - natural and artificial methods), cuttings, grafting, advantages and disadvantages of asexual rep...
🌱
Reproduction In Plants - Part 1
All animals need energy to live. To obtain this energy, animal rely directly/indirectly
on plants.
Plants convert the energy of sunlight into chemical energy. The chemical energy
becomes part of the organic substances such as glucose, starch, fats and proteins
that the plants make.
These substances, stored in storage organs: fruits or seeds can be used in the
manufacture of food products e.g. flour, cooking oil, maize meal
To feed the Earth’s growing population it has become essential to grow more and/or
increase the yield of food producing crops. It is therefore important to understand
how plants reproduce.
Asexual Reproduction
Asexual reproduction in plants is the production of a new generation of the same
species by one parent. As asexual reproduction takes place by means of mitosis, the
new organisms produced are genetically identical to the parents and each other. The
value of asexual reproduction in plants is that there will be no variation: any
commercial crop that reproduces asexually will therefore be of a known, consistent
quality.
A group of genetically identical organisms is called a clone.
Types of asexual reproduction
Reproduction In Plants - Part 1 1
, There are different types of asexual reproduction for propagating plants grown for
the manufacture of food:
🌱 VEGETATIVE PROPAGATION
Vegetative propagation occurs when new individuals are formed from cells that are
not involved in sexual reproduction.
Vegetative propagation either occurs:
A) naturally
B) artificially, induced by man in which case it occurs more rapidly than a plant
grown from seed
A) Natural Methods
Plants can reproduce asexually by means of special structures such as tubers, bulbs
and rhizomes. Propagation by these structures is quick cheap and easy.
Tubers and bulbs
Some plants produce underground structures such as tubers (swollen stems) or
bulbs (swollen leaves) that can produce new plants. These structures are swollen
with food (starch) for the growth of the new plant. This allows the plant to carry on
from one year to the next.
It is these storage organs that are often a valuable source of food for humans e.g.
potatoes and onion.
e.g. Stem tuber (potato)
When one potato tuber is planted it will grow into a plant with an aerial stem and
underground stems.
The tips of its underground stems develop into new tubers.
Each tuber develops axillary buds or ‘eyes’.
New potato plants can develop:
- naturally: each tuber can give rise to a new plant
- artificially: many potato plants can be propagated by cutting tubers into
sections, each
Reproduction In Plants - Part 1 2
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller zeeepeee786. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $2.82. You're not tied to anything after your purchase.
