Dev bio lab 1.pptx
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The document summarizes the structure of gametes in some representative cases. It describes eggs as spherical cells around 1.6 mm in diameter, covered in layers, with half the surface pigmented brown and containing yolk. The large egg nucleus lies in the pigmented half. Sperm are described as microscopic and motile, with a head containing a nucleus and acrosome, a midpiece containing mitochondria, and a long tail with axial filament. Sperm are produced in the testes through spermatogenesis and are capable of fertilizing eggs. Fertilized eggs undergo rotation which differentiates the cytoplasm into pigmented, grey crescent, and yolky regions, activating the cell for cleavage. Eg
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What happens at the mid-blastula transition in Xenopus? Which part of the Xenopus blastula
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2. Midblastula transition refers to a number of dramatic changes that occur at this stage in
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somites, floor plate of neural tube.
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8. Mesoderm develops into notochord, somites, kidneys, gonads, limbs, lateral plate, blood
islands, heart and blood vessels during the Xenopus development.
9. On the surface of the dorsal egg cortex egg toward the animal pole and internally components
associated with cortex move from a vegetal to a dorsal position..
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3. Morphology- Head , Thorax , Abdomen
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5. Anatomy- Digestive system, Blood vascular system, Respiratory system , Excretion , Nervous system , Reproductive system , Questions with answers
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core of India. Mirzapur, with its varied terrains and abundant biodiversity, offers an optimal
environment for investigating the changes in vegetation cover dynamics. Our study utilizes
advanced technologies such as GIS (Geographic Information Systems) and Remote sensing to
analyze the transformations that have taken place over the course of a decade.
The complex relationship between human activities and the environment has been the focus
of extensive research and worry. As the global community grapples with swift urbanization,
population expansion, and economic progress, the effects on natural ecosystems are becoming
more evident. A crucial element of this impact is the alteration of vegetation cover, which plays a
significant role in maintaining the ecological equilibrium of our planet.Land serves as the foundation for all human activities and provides the necessary materials for
these activities. As the most crucial natural resource, its utilization by humans results in different
'Land uses,' which are determined by both human activities and the physical characteristics of the
land.
The utilization of land is impacted by human needs and environmental factors. In countries
like India, rapid population growth and the emphasis on extensive resource exploitation can lead
to significant land degradation, adversely affecting the region's land cover.
Therefore, human intervention has significantly influenced land use patterns over many
centuries, evolving its structure over time and space. In the present era, these changes have
accelerated due to factors such as agriculture and urbanization. Information regarding land use and
cover is essential for various planning and management tasks related to the Earth's surface,
providing crucial environmental data for scientific, resource management, policy purposes, and
diverse human activities.
Accurate understanding of land use and cover is imperative for the development planning
of any area. Consequently, a wide range of professionals, including earth system scientists, land
and water managers, and urban planners, are interested in obtaining data on land use and cover
changes, conversion trends, and other related patterns. The spatial dimensions of land use and
cover support policymakers and scientists in making well-informed decisions, as alterations in
these patterns indicate shifts in economic and social conditions. Monitoring such changes with the
help of Advanced technologies like Remote Sensing and Geographic Information Systems is
crucial for coordinated efforts across different administrative levels. Advanced technologies like
Remote Sensing and Geographic Information Systems
9
Changes in vegetation cover refer to variations in the distribution, composition, and overall
structure of plant communities across different temporal and spatial scales. These changes can
occur natural.
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- 1. STUDY OF STRUCTURE OF GAMETES IN SOME REPRESENTATIVE CASES Presented By: Humna Nadeem
- 2. The egg or ovum is a spherical cell about 1.6 mm in diameter. It is covered by albumen layer and vitelline membrane. One half of its surface is deep blackish brown in color due to presence of a superficial layer of pigment. The other half is lighter in color and it is in this half that bulk of yolk is aggregated (telolecithal). The large egg nucleus lies in the pigmented half which is, therefore, the animal hemisphere of the egg. The dark area is known as vegetative pole.
- 4. The sperm is microscopic, thread-like, motile body having typical head, middle piece and tail. The head is elongated having a large haploid nucleus capped with conical acrosome. The middle piece has centriole and mitochondria. The middle piece is followed by a long tail. The tail bears an axial filament. The sperm is functionally mature and is capable of fertilizing the ovum. The sperms are produced in the seminiferous tubules of the testes as a result of spermatogenesis.
- 6. It is a diploid cell. In a fertilized egg, rotation of orientation occurs. Due to rotation of orientation, the ooplasm differentiates into upper pigmented half or animal hemisphere, light black-colored crescent-shaped grey crescent and whitish yolky lower part or vegetal hemisphere. It is an activated cell, ready to undergo process of cleavage.
- 9. Classification of egg based on distribution of yolk