2. Grade-7-Q2-Module-3-Asexual-Reproduction-2nd-Ed.pdf

Science 7 Q2.3

1. “Una satanan, BATA: Buligan, Amligan, Tudluan, Alalayan!”


DIVISION OF BACOLOD CITY


Science
Quarter 2
Self Learning Module 3:
Asexual and Sexual Reproduction
















Self-Learning Module









7

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Science - Grade 7
Quarter 2
Self Learning Module 3- Asexual and Sexual Reproduction
Second Edition, 2021

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Writer: Irene G. Danganan
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This module was designed and written with you in mind. It is here to help you
differentiate asexual from sexual reproduction in terms of: a. number of
individuals involved, b. similarities of offspring to parents; (S7LT-IIg-7). The
scope of this module allows you to use it in many different learning situations. The
language used recognizes the diverse vocabulary level of students. The lessons are
arranged to follow the standard sequence of the course. But the order in which you
read them can be changed to correspond with the textbook you are now using.
This module is composed of one lesson:
• Lesson 1 – Asexual Reproduction
After going through this module, you are expected to
1. describe Asexual Reproduction,
2. identify the types of Asexual Reproduction,
3. explain how some organisms reproduce asexually,
4. discuss the similarities of the offspring from the parents involved in
asexual reproduction,
5. describe the number of individuals involved in Asexual
Reproduction,
6. differentiate each type of Asexual Reproduction,
7. understand the importance of Asexual Reproduction, and
8. examine the different kinds of organisms around them that
reproduce asexually.









I Need to Know

4. 4



Lesson
1
Asexual Reproduction

Reproduction also known as procreation or breeding is an important part of
life wherein new individual organisms or what we call the “offspring” are produced
from their “parents”. It is a biological process which makes it possible for different
kind of organisms to exist. Each new living organism that we see around us is a
result of reproduction. It is a way to continue the presence of different kind of species
in our environment. There are two forms of reproduction: Asexual and Sexual.










Figure 1. Organisms that reproduce asexually

Asexual Reproduction is the formation of new individual organisms from a
single parent. The offspring is considered to be the “clone” because they show the
exact same characteristics and traits from their parent. So, it means that the parent
and the offspring are genetically identical.
Asexual reproduction can take place by natural or artificial means wherein
human activity can facilitate the process of reproduction. It can be advantageous
because reproduction can be more energy efficient and faster than sexual
reproduction. Thus, there is an increased rate of maturity and adaptability to the
changing environment.
There are different types of Asexual Reproduction: there can be asexual
reproduction in plants and also different types of asexual reproduction in animals.

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a. Asexual Reproduction in plants - also called Vegetative Propagation is
a common asexual reproduction in plants. The roots, stems and leaves of plants
are “special vegetative structures” that naturally give rise to new plant individuals
with similar genetic makeup with the parent plants. They are commonly used in
horticulture and agricultural areas and employed various methods to multiply the
production of plants faster. There are different forms of Vegetative Reproduction.









Figure 2. Bryophyllum (Kataka-taka)


Table 1: Different Forms of Vegetative Reproduction
Form of Vegetative
Reproduction
Description Example

Figure 3. Axonopus
Compressus Stolon
1. Runners or Stolon
- this is a form of vegetative
reproduction wherein slender
stems are growing horizontally
at the base of the plants along
the ground. They develop roots
when the nodes touch the soil
and new shoots begin to grow
into new plants.


Strawberry and
Bermuda grass

Figure 4. Ginger Shoots

2. Rhizomes – they are
usually underground plants
that naturally produce root
and shoot systems of new
plants above the ground.



Ginger and Turmeric

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Figure 5. Potatoes
growing buds
3. Tubers – they are fleshy
thickened underground
stems or roots where new
plants are formed from the
“eyes” or buds found around
them.


Potatoes and Yams




Figure 6. Onion bulbs
4. Bulbs – they usually grow
just below the surface of the
ground and produce stems
with fleshy and leafy shoots
above the ground


Onions and Garlic
Figure 7. Saffron crocus
5. Corms – they are rounded
plant stem that serves as a
storage organ for food or
nutrients for some plants.
They do not have layers of
modified leaves.



Crocus and Gladiolas.

Figure 8. Cactus

6. Budding - is a mean of
asexual reproduction in
which a new organism is
developed from an outgrowth
or grows out of the body of a
parent. The outgrowth then
splits off or separates from
the parent then it can live
independently as a new
individual.


Cactus and Succulents

There is also what we call as Artificial Vegetative Propagation which is a
type of plant reproduction that involves human intervention. Usually, horticulturists
and gardeners employ this kind of vegetative reproduction to give rise to new and
sometimes novel plants and give diversity to the plant kingdom. The two most
common methods are GRAFTING and CUTTING.

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Table 2: Artificial Vegetative Propagation
Form of Artificial
Vegetative Propagation
Description Example
Figure 9. Grafted plant

1. Grafting – a widely used
method wherein a branch is cut
then a twig from the desired plant
is inserted in a notch made on the
stump.


Commonly done on
fruit bearing and
ornamental plants.

Figure 10. Camote leaves
2. Cutting – it is a process
whereby a stem is cut from the
main plant and then planted in
the soil. Roots form the lower
end and new shoots arise from
the planted stem.



Some of the leafy
vegetables like
camote leaves and
alugbati

b. Asexual reproduction in animals or other organisms- asexual
reproduction is not only limited to plants but also other organisms wherein a single
parent is involved and the offspring has the exact same characteristics that they
have. The following are: Fission, Budding, Spore Formation, Regeneration and
Fragmentation.

Table 3: Asexual Reproduction in animals or other organisms
Form of Asexual
Reproduction in animals
or other organisms
Description Example


Figure 11. An Amoeba
undergoing fission

1. Fission - it is commonly
known as Binary Fission
wherein a single celled
organism reproduces with
their exact same
organelles copied and
dividing themselves into
two equal halves called
the daughter cells. Each
daughter cell continues to
grow until it becomes as
large as the parent cell.


Bacteria and Protists (Amoeba
and Paramecium) are the most
common example of organisms
that uses this type of asexual
reproduction.

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Figure 12. Yeast in bread
2. Budding in other
organisms – the same
happens in budding with
plants and other
organisms, an outgrowth
grows out and separates
from the parent and live as
a new organism.

Yeast which is a kind of Fungi
is also another organism that
reproduces through budding.
It is mixed with flour and
helps the bread rise after
being left for a certain amount
of time.
Figure 13. Molds on rotten
tomato
Figure 14. Fern spores
3. Spore Formation
– also called Sporulation.
They reproduce spores
that are released and may
be carried by wind or
water. Once the spore
lands on a favorable
environment, they
germinate and develop
into new organisms. When
you see a piece of bread
or leftover food that has
molds on them, this type
of asexual reproduction is
happening. It is common
among molds or fungi and
some plants.


Bread Molds or Fungi and some
plants.

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Figure 15. Gecko
Figure 16. Starfish
4. Regeneration - is a type
of asexual reproduction
where the organism is
capable of re growing
certain parts of its body
when it loses them. So,
when a body part of an
organism has broken off, it
can grow a new one. Just
like a starfish when one arm
is detached or a lizard cut
its tail, they grow it back
after a certain amount of
time as if nothing has
happened.


Starfish and Tail of a Lizard





Figure 17. A visual
representation on how
fragmentation happens
5. Fragmentation – it is a
form of asexual
reproduction whereby a
single parent breaks into
parts and regenerates into
whole new individuals. The
body of the parent is broken
down into several pieces
then the broken parts
develop into new complete
offspring.


It can be seen on
cyanobacteria, fungi and
some animals including
flatworms and sponges.





Activity 1: Table of Asexual Reproduction

Materials activity sheet pen
Procedure
Box A




Vegetative Reproduction Budding Regeneration
Fission Spore Formation
I Will Do This

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Box B













1. Read the lesson overview regarding Asexual Reproduction for 10 minutes.
2. Looking at the pictures of different organisms on column one of the table,
complete the second and third column with the Type of Reproduction and its
description. Answers can be based on Box A and Box B above.
3. Write your answers on the spaces provided on the table.

Table of Asexual Reproduction

Organisms Type of Asexual
Reproduction
Description
a. b.
c. d.
e. f.
• a single celled organism reproduces with their exact same organelles
copied and dividing themselves into two equal halves.
• Organisms reproduce spores that are released and may be carried by
wind or water. Once the spore lands on a favorable environment, they
germinate and develop into new organisms.
• An organism is capable of re growing certain parts of its body when it
loses them.
• A new organism is developed from an outgrowth or grows out of the
body of a parent.
• The roots, stems and leaves of plants are “special vegetative
structures” that naturally give rise to new plant individuals

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g. h.
i. j.

Analysis Questions:

1. Write your answers briefly regarding the different types of Asexual
Reproduction.
a. What is Vegetative Reproduction?
_____________________________________________________________
_____________________________________________________________

b. What happens to organisms that undergo Fission?
_____________________________________________________________
_____________________________________________________________
c. How does Budding occur?
_____________________________________________________________
_____________________________________________________________
d. What happens to the organisms during Spore Formation?
_____________________________________________________________
_____________________________________________________________
e. What is Regeneration?
_____________________________________________________________
______________________________________________________ _______

2. Based on the sample pictures and descriptions of Asexual Reproduction,
How would you describe the characteristics of the parent and the offspring?





_____________________________________________________________
_____________________________________________________________
_____________________________________________________________

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3. What do you think would be the advantage of an organism that reproduces
asexually?
_____________________________________________________________
_____________________________________________________________
_____________________________________________________________





Each organism on the picture reproduces asexually. Write their type of
asexual reproduction on the spaces provided below each picture. Choose from the
answers on the box below.


























Grafting Budding Regeneration
Fission Spore Formation
I Will Practice
1._________________ 2._________________
3._________________
4._________________
5._________________

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Give an example of an organism that is reproduced through this type of
asexual reproduction.
1. Cutting - _________________________
2. Fission - __________________________
3. Budding on plants - _________________
4. Spore Formation - __________________
5. Regeneration - _____________________





















Mariana Trench

Mariana Trench

Mariana Trench

Mariana Trench

I Will Practice
1. Grafting 2. Budding 3. Regeneration
4. Spore Formation 5. Fission




I Will Apply
1. alugbati 2. amoeba 3. Cactus
4. molds 5.starfish


I Will Do This
a. SPORE
FORMATION
b. Organisms reproduce spores that are released and may be carried
by wind or water. Once the spore lands on a favorable environment,
they germinate and develop into new organisms
c. VEGETATIVE
REPRODUCTION
d. The roots, stems and leaves of plants are “special vegetative
structures” that naturally give rise to new plant individuals
e. REGENERATION f. An organism is capable of re growing certain parts of its body when it
loses them.
g. BUDDING h. a new organism is developed from an outgrowth or grows out of the
body of a parent.
i. FISSION j. a single celled organism reproduces with their exact same organelles
copied and dividing themselves into two equal halves

I Will Apply
Key Answer

14. 14












References
Science 7 Learner’s Material pp 102-107
https://en.m.wikipedia.org
www.biology-pages.info
www.ibiology.org
www.courses.lumenlearning.com
www.ucmp.berkeley.edu
www.google.images.com












Analysis Questions:
1. a. The roots, stems and leaves of plants are “special vegetative structures” that naturally give rise to new plant
individuals with similar genetic makeup with the parent plants.
1. b. Single celled organism reproduces with their exact same organelles copied and dividing themselves into two equal
halves called the daughter cells.
1. c. New organism is developed from an outgrowth or grows out of the body of a parent. The outgrowth then splits off
or separates from the parent then it can live independently as a new individual.
1. d. They reproduce spores that are released and may be carried by wind or water. Once the spore lands on a
favorable environment, they germinate and develop into new organisms.
1. e. Organisms are capable of re growing certain parts of its body when it loses them.
2. There is only one parent involved in the reproduction and the offspring shows the exact same physical characteristics
and traits from that parent.
3. Asexual reproduction is faster, so the rate of maturity and adaptability of the organisms is increased.

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Name: _______________________________ Grade & Section: ___________

Part I. Multiple Choice. Read each item carefully. Select the letter of the best
answer
1. What is the biological process which makes it possible for different kind of
organisms to exist?
A. Reflection
B. Rejuvenation
C. Replication
D. Reproduction

2. Which describes Asexual Reproduction?
A. the parent and the offspring are genetically identical.
B. it is the formation of new individual organisms from a single parent.
C. the offspring is considered to be the “clone” because they show the exact
same characteristics and traits from their parent.
D. all of the above

3. How are the genes of the parent and offspring in asexual reproduction
characterized?
A. they are genetically identical
B. they are from different parents
C. they are completely different from each other
D. they are not passed on from the parent to the offspring

4. What can be the advantage of asexual reproduction?
A. Asexual reproduction better promotes genetic diversity.
B. In asexual reproduction, organisms will quickly be out adapted and out
evolved by their neighbors.
C. Asexual reproduction is a more efficient way because organisms tend to
reproduce faster, thus there is an increased rate of maturity and
adaptability to the changing environment.
D. all of the above




Written Assessment No. 3 Worksheet
Concept Check

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5. Why do horticulturists and gardeners prefer to employ or use Artificial
Vegetative Propagation?
A. They use this method to give rise to new and sometimes novel plants
and give diversity to the plant kingdom.
B. This method is less energy efficient and faster than sexual
reproduction.
C. There is a decreased rate of maturity and adaptability to the changing
environment.
D. There is a constant rate of maturity and adaptability so there is diversity
to the plant kingdom.


6. A starfish is an organism that reproduces asexually by regeneration. What will
happen when one of its arms is cut off?
A. When the arm is cut off, it can just grow a new one.
B. The arm that was cut off will regenerate into a whole new individual.
C. The organelles will be copied and will divide themselves into two equal
halves called the daughter cells.
D. An outgrowth grows out and separates from the parent and lives as a
new organism.

7. Your mother is cooking for lunch, after removing the leaves in the alugbati to
be cooked, she asked you to plant the stems in the garden. Will they grow
and reproduce?
A. Yes, because they can reproduce through cutting.
B. Yes, new plants will be formed from the “eyes” or buds that will be
found around them.
C. Yes, there will just be a development from an outgrowth in the body of
the plant through budding.
D. No, they need seeds to grow.

8. How does a new organism form through Budding?
A. The new organism is capable of re growing certain parts of its body when
it loses them.
B. There is an outgrowth from the body of the parent, then it splits off and
can live independently as a new individual.
C. Single celled organisms reproduce with their exact same organelles
copied and dividing themselves into two equal halves.
D. Spores that are released and may be carried by wind or water, once
lands on a favorable environment can germinate and develop into new
organisms.

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Part II. You Complete Me. Complete the table of Asexual Reproduction. Write
the Form of Asexual Reproduction, Description and/or Description as needed on
the space provided.
Forms of Asexual
Reproduction
Description Example

Runners or Stolons

1.

Strawberry and Bermuda grass

2.

A method wherein a branch is cut then
a twig from the desired plant is
inserted in a notch made on the
stump.
Commonly done on fruit
bearing and ornamental plants.

3.
Type of asexual reproduction where the
organism is capable of re growing
certain parts of its body when it loses
them. So, when a body part of an
organism has broken off, it can grow a
new one. Just like a starfish when one
arm is detached or a lizard cut its tail,
they grow it back after a certain amount
of time as if nothing has happened.

4.


Cutting

5.


Some of the leafy vegetables
like camote leaves and alugbati

6.
It is commonly known as Binary
Fission wherein a single celled
organism reproduces with their exact
same organelles copied and dividing
themselves into two equal halves
called the daughter cells. Each
daughter cell continues to grow until it
becomes as large as the parent cell.

7.

Reflection
Why do organisms need to reproduce?
__________________________________________________ _______________________
_________________________________________________________________________
______________________________________________________________ ___________

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FOR TEACHER’S USE ONLY. Do not attach this portion to the SLM for students.






I. Multiple Choice

1. A
2. D
3. A
4. D
5. A
6. A
7. A
8. B

II. You Complete Me
Forms of
Asexual
Reproduction
Description Example
Runners or
Stolons
1. It is a form of vegetative reproduction wherein slender
stems are growing horizontally at the base of the plants
along the ground. They develop roots when the nodes
touch the soil and new shoots begin to grow into new plants
Strawberry and Bermuda
grass
2. Grafting A method wherein a branch is cut then a twig from the
desired plant is inserted in a notch made on the stump
Commonly done on fruit
bearing and ornamental
plants.
3. Fragmentation Type of asexual reproduction where the organism is
capable of re growing certain parts of its body when it loses
them. So, when a body part of an organism has broken off,
it can grow a new one. Just like a starfish when one arm is
detached or a lizard cut its tail, they grow it back after a
certain amount of time as if nothing has happened.
4.Starfish and Tail of a Lizard
Cutting 5It is a process whereby a stem is cut from the main plant
and then planted in the soil. Roots form the lower end and
new shoots arise from the planted stem.
Some of the leafy vegetables
like camote leaves and
alugbati
6.Fission It is commonly known as Binary Fission wherein a single
celled organism reproduces with their exact same
organelles copied and dividing themselves into two equal
halves called the daughter cells. Each daughter cell
continues to grow until it becomes as large as the parent
cell.
7. Bacteria and Protists
(Amoeba and Paramecium)
are the most common
example of organisms that
uses this type of asexual
reproduction.

Reflection
Why do organisms need to reproduce?
There is a need for organisms to reproduce because reproduction is the way of our environment to
continue the presence of the different kinds of species around us. It is a biological process which
makes it possible for different organisms to exist.



Answer Key to Concept Check

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Office Address: Rosario-San Juan Sts., Bacolod City,
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e-mail address: [email protected]