This document summarizes the key stages of development for insects, including pre-embryonic, embryonic, and post-embryonic development. Pre-embryonic development involves fertilization, where the sperm fuses with the egg nucleus. Embryonic development starts with the egg, and involves cleavage, formation of germ layers, and growth of tissues and organs. Post-embryonic development or morphogenesis occurs after hatching, and involves molting between instar stages as the insect grows and matures, until reaching the final adult form.
Embryology is the branch of biology which deals with the growth and development of an embryo of
an organism, commencing with the union of male and female gametes.
Embryology includes the development of the fertilized egg and embryo and the growth of the organ
system.
Development of an insect from egg to adult can be divided into two parts
a.Early embryonic development - takes place inside the egg and
b. Post embryonic development – occurring outside the egg.
Embryology is the branch of biology which deals with the growth and development of an embryo of
an organism, commencing with the union of male and female gametes.
Embryology includes the development of the fertilized egg and embryo and the growth of the organ
system.
Development of an insect from egg to adult can be divided into two parts
a.Early embryonic development - takes place inside the egg and
b. Post embryonic development – occurring outside the egg.
its all about respiratory system of insects, arrangement and position of spiracles system. Types of different respiratory systems in aquatic insects.
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the presentation will help you learn more about how the insect eyes really work in field conditions and more over for the better understanding you can take help from from book: THE INSECTS:STRUCTURE AND FUNCTION byR.F.CHAPMAN.....as the contents of my presentation are from that book only.....
its all about respiratory system of insects, arrangement and position of spiracles system. Types of different respiratory systems in aquatic insects.
Contact Email: mzeeshan_93@yahoo.com
the presentation will help you learn more about how the insect eyes really work in field conditions and more over for the better understanding you can take help from from book: THE INSECTS:STRUCTURE AND FUNCTION byR.F.CHAPMAN.....as the contents of my presentation are from that book only.....
By Rehet Kaur Bhatia 8D . This is created With a lot of patience and hard work And is not to scale. this chapter is Intrusting and teaches us alot of things.
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The physiological processes that regulate parturition and the onset of labor continue to be defined. It is clear, however, that labor onset represents the culmination of a series of biochemical changes in the uterus and cervix. These result from endocrine and paracrine signals emanating from both mother and fetus.
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Synthetic fiber production is a fascinating and complex field that blends chemistry, engineering, and environmental science. By understanding these aspects, students can gain a comprehensive view of synthetic fiber production, its impact on society and the environment, and the potential for future innovations. Synthetic fibers play a crucial role in modern society, impacting various aspects of daily life, industry, and the environment. ynthetic fibers are integral to modern life, offering a range of benefits from cost-effectiveness and versatility to innovative applications and performance characteristics. While they pose environmental challenges, ongoing research and development aim to create more sustainable and eco-friendly alternatives. Understanding the importance of synthetic fibers helps in appreciating their role in the economy, industry, and daily life, while also emphasizing the need for sustainable practices and innovation.
This presentation provides an introduction to quantitative trait loci (QTL) analysis and marker-assisted selection (MAS) in plant breeding. The presentation begins by explaining the type of quantitative traits. The process of QTL analysis, including the use of molecular genetic markers and statistical methods, is discussed. Practical examples demonstrating the power of MAS are provided, such as its use in improving crop traits in plant breeding programs. Overall, this presentation offers a comprehensive overview of these important genomics-based approaches that are transforming modern agriculture.
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Unit 8 - Information and Communication Technology (Paper I).pdfThiyagu K
This slides describes the basic concepts of ICT, basics of Email, Emerging Technology and Digital Initiatives in Education. This presentations aligns with the UGC Paper I syllabus.
Power-sharing Class 10 is a vital aspect of democratic governance. It refers to the distribution of power among different organs of government, levels of government, and social groups. This ensures that no single entity can control all aspects of governance, promoting stability and unity in a diverse society.
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The Roman Empire A Historical Colossus.pdfkaushalkr1407
The Roman Empire, a vast and enduring power, stands as one of history's most remarkable civilizations, leaving an indelible imprint on the world. It emerged from the Roman Republic, transitioning into an imperial powerhouse under the leadership of Augustus Caesar in 27 BCE. This transformation marked the beginning of an era defined by unprecedented territorial expansion, architectural marvels, and profound cultural influence.
The empire's roots lie in the city of Rome, founded, according to legend, by Romulus in 753 BCE. Over centuries, Rome evolved from a small settlement to a formidable republic, characterized by a complex political system with elected officials and checks on power. However, internal strife, class conflicts, and military ambitions paved the way for the end of the Republic. Julius Caesar’s dictatorship and subsequent assassination in 44 BCE created a power vacuum, leading to a civil war. Octavian, later Augustus, emerged victorious, heralding the Roman Empire’s birth.
Under Augustus, the empire experienced the Pax Romana, a 200-year period of relative peace and stability. Augustus reformed the military, established efficient administrative systems, and initiated grand construction projects. The empire's borders expanded, encompassing territories from Britain to Egypt and from Spain to the Euphrates. Roman legions, renowned for their discipline and engineering prowess, secured and maintained these vast territories, building roads, fortifications, and cities that facilitated control and integration.
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3. Pre-embryonic
Fertilization
• The sperm swim toward the micropyle -- the first one to
reach its destination enters and injects its nucleus into the
egg.
• The sperm nucleus quickly fuses with the egg nucleus to
form a diploid zygote -- a one-celled embryo.
• This event is known as fertilization.
• After the egg is fertilized, it undergoes a period of rapid
growth and development known as embryogenesis.
4. • The micropyle, a special opening near the anterior end of
the chorion, serves as a gateway for entry of sperm during
fertilization.
5. • A female receives sperm from her male partner during the
act of mating---insemination
• She can store that sperm for long periods of time in a
special part of her reproductive system, the
spermatheca.
• As a developing egg moves past the opening to the
spermatheca, a few sperm are released onto its surface.
7. Egg
In most insects, life begins as an independent egg.
This type of reproduction is known as oviparity.
Manufactured within the female's genital system
Released from her body through an ovipositor
Production of eggs by the female is called oogenesis
The egg-laying process is known as oviposition.
8. • Each insect species produces eggs that are genetically
unique and often physically distinctive as well --
spherical, ovate, conical, sausage-shaped, barrel-shaped,
or torpedo-shaped.
• Each egg is composed of only a single living cell -- the
female gamete.
11. • The egg is covered by a protective
"shell" of protein secreted before
oviposition by accessory glands in
the female's reproductive system.
• This egg shell, called the chorion ,
is sculptured with microscopic
grooves or ridges that may be
visible only under an electron
microscope.
• The chorion is perforated by
microscopic pores (called aeropyles
) that allow respiratory exchange of
oxygen and carbon dioxide with
relatively little loss of water.
chorion
12. Oviparous-
expulsion of egg from
oviduct
Ovoviviparous-
eggs incubated in
reproductive tract
hatch immediately
upon being laid
Viviparous-
Giving birth to
young. Several
forms of this are
seen in insects.
Egg Fertilization
Egg
Egg
Fertilization
Fertilization
Egg membrane
Placental (aphids), haemocoelus
(hemocoel, gall midges), adentrophic
(nurse gland, fully grown larva tsetse fly.
The main type of Reproduction
13. The Other Type of
Reproduction In Insect
• Paedogenesis
– Reproduction by larval insects
• Parthenogenesis
– Development without fertilization
– Unfertilized eggs produce:
• Males (arrhenotoky) in Hymenoptera
• Females (thelytoky)
• Both (amphitoky) in aphids, some wasps
• Polyembryony
14. Polyembryonic
• Found in some endoparasitic groups only
• Single egg results in 2 to ‘several thousand’
larvae
• Some larvae may be ‘defender morphs’
– Hatch more quickly
– Eliminate rival parasites
– Fail to pupate & they die
• Remaining larvae become ‘reproductive
morphs’ that complete development and
reproduce to carry on the species
15. EMBRYONIC PROCESS
A developmental process that usually begins once the
egg has been fertilized.
It involves multiplication of cells (by mitosis) and their
subsequent growth, movement, and differentiation into
all the tissues and organs of a living insect.
17. Developmental Fate of Insect Germ Layers
• Ectoderm: Epidermis, exocrine glands, brain and
nervous system, sense organs, foregut and hindgut,
respiratory system, external genitalia.
• Mesoderm: Heart, blood, circulatory system,
muscles, endocrine glands, fat body, gonads
• Endoderm: Midgut.
18.
19. Embryonic development of
tobacco hornworm
M. sexta egg
showing micropyle
.Manduca sexta eggs.
M. sexta embryo 19
hours after fertilization
M. sexta embryo 37
hours after fertilization
M. sexta embryo 57
hours after fertilization
M. sexta embryo 115
hours after fertilization.
Newly emerged larva
showing the head
20. Summary of Insect Development
Yolk distribution- centralized
Cleavage type - meroblastic, only portion of yolk undergoes
cleavage
Blastula- steroblastic
Gastrulation- ingression and invagination
Blastospore type- protostome (mouth and anus from
blastospore)
Larval development- multiple molts, maggot, nymph, caterpillar,
pupa, adult (imago)
Developmental determination- mosaic pattern
22. • Once the hatching emerges, it is called a
first instar nymph (or larva).
• As it grows, it will continue to develop and
mature.
• These post-embryonic changes are known
as morphogenesis.
23. MORPHOGENESIS
• Once an insect hatches from the egg it is usually able to
survive on its own, but it is small, wingless, and sexually
immature.
• Its primary role in life is to eat and grow.
• If it survives, it will periodically replace its exoskeleton
(a process known as molting).
24. • In many species, there are other physical changes
that also occur as the insect gets older (growth of
wings and development of external genitalia, for
example).
• Collectively, all changes that involve growth,
molting, and maturation are known as
morphogenesis.
26. Molting
• The molting process is triggered by hormones released
when an insect's growth reaches the physical limits of its
exoskeleton.
• Each molt represents the end of one growth stage (instar)
and the beginning of another
27. • In some insect species the number of instars is constant
(typically from 3 to 15), but in others it may vary in
response to temperature, food availability, or other
environmental factors.
• Molting stops when the insect becomes an adult --
energy for growth is then channeled into production of
eggs and sperm.
28. • An insect cannot survive without the support and
protection of its exoskeleton, so a new, larger
replacement must be constructed inside the old one --
much like putting an overcoat under a sweater!
29. • An insect that is actively constructing new exoskeleton is
said to be in a pharate condition.
• During the days or weeks of this process there may be very
little evidence of change.
• Ecdysis, however, occurs quickly (in minutes to hours).
30. • A newly molted insect is soft and largely unpigmented
(white or ivory).
• It is said to be in a teneral condition until the process of
tanning is completed (usually a day or two).
31. Summary of Molting
• Step 1: Apolysis -- separation of old exoskeleton from epidermis
• Step 2: Secretion of inactive molting fluid by epidermis
• Step 3: Production of cuticulin layer for new exoskeleton
• Step 4: Activation of molting fluid
• Step 5: Digestion and absorption of old endocuticle
• Step 6: Epidermis secretes new procuticle
• Step 7: Ecdysis -- shedding the old exo- and epicuticle
• Step 8: Expansion of new integument
• Step 9: Tanning -- sclerotization of new exocuticle
32. Exoskeleton traits
• fixed in size
• new exoskeleton
Incorporates the changes that are part of
metamorphosis.
Initially soft and is larger than the old exoskeleton.
33. • Stages between each molt are called instars.
first stage which emerged from the egg is the first
instar or nymph.
-- to grow must shed its skin or molt
-- may be four or five instars before the adult stage is reached