Leaves are lateral outgrowths from nodes that contain chlorophyll and carry out photosynthesis. They come in simple and compound forms and have various parts like the lamina, petiole, and veins. Leaves exhibit different venation patterns and are arranged on stems in opposite, alternate, or whorled phyllotaxy. In addition to photosynthesis, leaves function in gas exchange, transpiration, reproduction, and storage. Some leaves are modified for additional purposes like tendrils, spines, pitchers, and bladders. Certain plants like Bryophyllum can propagate vegetatively from buds formed on leaves.
Leaf - Introduction,Structure of A Leafsehriqayyum
Leaf - Introduction,Structure of A Leaf
Structure of Leaves
Though leaves of different plants are different, they have some common features like midrib, margin, veins, leaf apex, leaf stalk.The Petiole is a short length of stem that joins the leaf to stem.
Plants are an essential part of the ecosystem. Every life on the earth is directly or indirectly dependent on plants. Among the different parts of a plant, the leaf is the most essential.
Leaf - Introduction,Structure of A Leafsehriqayyum
Leaf - Introduction,Structure of A Leaf
Structure of Leaves
Though leaves of different plants are different, they have some common features like midrib, margin, veins, leaf apex, leaf stalk.The Petiole is a short length of stem that joins the leaf to stem.
Plants are an essential part of the ecosystem. Every life on the earth is directly or indirectly dependent on plants. Among the different parts of a plant, the leaf is the most essential.
The lecture notes provide an understanding of the different types of roots and their morphology. different types of roots have been clearly explained with their pictures and labeled diagrams included, enjoy the reading
Asangalwisye deo
SJUT
This is a three chapter review for the Agriculture Major Admission Test conducted by the College of Agriculture of Cavite State University, the topicsare: Plant Bilogy, Crop and Agriculture and basic Physiological processes of plants. Credits to all my sourceswhich include lecture notes from our faculty, online sources and books published in the Republic of the Philippines.
A principal appendage of the stem
On branches of a plant
Arise from nodes
Bear lateral buds in their axils
Chief photosynthetic organ
Developed in acropetal succession
Exogenous in origin
Plant leaves help to sustain life on earth as they generate food for both plant and animal life. The leaf is the site of photosynthesis in plants. Photosynthesis is the process of absorbing energy from sunlight and using it to produce food in the form of sugars. Leaves make it possible for plants to fulfill their role as primary producers in food chains. Not only do leaves make food, but they also generate oxygen during photosynthesis and are major contributors to the cycle of carbon and oxygen in the environment. Leaves are a part of the plant shoot system, which also includes stems and flowers.
1. Plant leaves are very important structures as they help to maintain life on earth by generating food (sugars) via photosynthesis.
2. Leaves can have different shapes and sizes. The basic components of leaves in flowering plants (angiosperms) include the blade, the petiole, and the stipules.
3. There are three main tissues found in leaves: the epidermis, the mesophyll, as well as vascular tissue. Each tissue type is composed of layers of cells.
In addition to performing photosynthesis, some plants have other highly specialized functions. Examples include carnivorous plants that can 'eat' insects.
4. Some animals, like the Indian leafwing butterfly, mimic leaves to camouflage themselves from predators.
Biological screening of herbal drugs: Introduction and Need for
Phyto-Pharmacological Screening, New Strategies for evaluating
Natural Products, In vitro evaluation techniques for Antioxidants, Antimicrobial and Anticancer drugs. In vivo evaluation techniques
for Anti-inflammatory, Antiulcer, Anticancer, Wound healing, Antidiabetic, Hepatoprotective, Cardio protective, Diuretics and
Antifertility, Toxicity studies as per OECD guidelines
Acetabularia Information For Class 9 .docxvaibhavrinwa19
Acetabularia acetabulum is a single-celled green alga that in its vegetative state is morphologically differentiated into a basal rhizoid and an axially elongated stalk, which bears whorls of branching hairs. The single diploid nucleus resides in the rhizoid.
A Strategic Approach: GenAI in EducationPeter Windle
Artificial Intelligence (AI) technologies such as Generative AI, Image Generators and Large Language Models have had a dramatic impact on teaching, learning and assessment over the past 18 months. The most immediate threat AI posed was to Academic Integrity with Higher Education Institutes (HEIs) focusing their efforts on combating the use of GenAI in assessment. Guidelines were developed for staff and students, policies put in place too. Innovative educators have forged paths in the use of Generative AI for teaching, learning and assessments leading to pockets of transformation springing up across HEIs, often with little or no top-down guidance, support or direction.
This Gasta posits a strategic approach to integrating AI into HEIs to prepare staff, students and the curriculum for an evolving world and workplace. We will highlight the advantages of working with these technologies beyond the realm of teaching, learning and assessment by considering prompt engineering skills, industry impact, curriculum changes, and the need for staff upskilling. In contrast, not engaging strategically with Generative AI poses risks, including falling behind peers, missed opportunities and failing to ensure our graduates remain employable. The rapid evolution of AI technologies necessitates a proactive and strategic approach if we are to remain relevant.
June 3, 2024 Anti-Semitism Letter Sent to MIT President Kornbluth and MIT Cor...Levi Shapiro
Letter from the Congress of the United States regarding Anti-Semitism sent June 3rd to MIT President Sally Kornbluth, MIT Corp Chair, Mark Gorenberg
Dear Dr. Kornbluth and Mr. Gorenberg,
The US House of Representatives is deeply concerned by ongoing and pervasive acts of antisemitic
harassment and intimidation at the Massachusetts Institute of Technology (MIT). Failing to act decisively to ensure a safe learning environment for all students would be a grave dereliction of your responsibilities as President of MIT and Chair of the MIT Corporation.
This Congress will not stand idly by and allow an environment hostile to Jewish students to persist. The House believes that your institution is in violation of Title VI of the Civil Rights Act, and the inability or
unwillingness to rectify this violation through action requires accountability.
Postsecondary education is a unique opportunity for students to learn and have their ideas and beliefs challenged. However, universities receiving hundreds of millions of federal funds annually have denied
students that opportunity and have been hijacked to become venues for the promotion of terrorism, antisemitic harassment and intimidation, unlawful encampments, and in some cases, assaults and riots.
The House of Representatives will not countenance the use of federal funds to indoctrinate students into hateful, antisemitic, anti-American supporters of terrorism. Investigations into campus antisemitism by the Committee on Education and the Workforce and the Committee on Ways and Means have been expanded into a Congress-wide probe across all relevant jurisdictions to address this national crisis. The undersigned Committees will conduct oversight into the use of federal funds at MIT and its learning environment under authorities granted to each Committee.
• The Committee on Education and the Workforce has been investigating your institution since December 7, 2023. The Committee has broad jurisdiction over postsecondary education, including its compliance with Title VI of the Civil Rights Act, campus safety concerns over disruptions to the learning environment, and the awarding of federal student aid under the Higher Education Act.
• The Committee on Oversight and Accountability is investigating the sources of funding and other support flowing to groups espousing pro-Hamas propaganda and engaged in antisemitic harassment and intimidation of students. The Committee on Oversight and Accountability is the principal oversight committee of the US House of Representatives and has broad authority to investigate “any matter” at “any time” under House Rule X.
• The Committee on Ways and Means has been investigating several universities since November 15, 2023, when the Committee held a hearing entitled From Ivory Towers to Dark Corners: Investigating the Nexus Between Antisemitism, Tax-Exempt Universities, and Terror Financing. The Committee followed the hearing with letters to those institutions on January 10, 202
2024.06.01 Introducing a competency framework for languag learning materials ...Sandy Millin
http://sandymillin.wordpress.com/iateflwebinar2024
Published classroom materials form the basis of syllabuses, drive teacher professional development, and have a potentially huge influence on learners, teachers and education systems. All teachers also create their own materials, whether a few sentences on a blackboard, a highly-structured fully-realised online course, or anything in between. Despite this, the knowledge and skills needed to create effective language learning materials are rarely part of teacher training, and are mostly learnt by trial and error.
Knowledge and skills frameworks, generally called competency frameworks, for ELT teachers, trainers and managers have existed for a few years now. However, until I created one for my MA dissertation, there wasn’t one drawing together what we need to know and do to be able to effectively produce language learning materials.
This webinar will introduce you to my framework, highlighting the key competencies I identified from my research. It will also show how anybody involved in language teaching (any language, not just English!), teacher training, managing schools or developing language learning materials can benefit from using the framework.
This slide is special for master students (MIBS & MIFB) in UUM. Also useful for readers who are interested in the topic of contemporary Islamic banking.
How to Make a Field invisible in Odoo 17Celine George
It is possible to hide or invisible some fields in odoo. Commonly using “invisible” attribute in the field definition to invisible the fields. This slide will show how to make a field invisible in odoo 17.
Model Attribute Check Company Auto PropertyCeline George
In Odoo, the multi-company feature allows you to manage multiple companies within a single Odoo database instance. Each company can have its own configurations while still sharing common resources such as products, customers, and suppliers.
2. What is a leaf?
The lateral flat, thin green, broad
outgrowth arising from the node is known
as leaf
3. Why are the
leaves green?
The Leaves are
green because
of the presence
of chlorophyll.
4. Parts of a leaf
1: Lamina or leaf Blade- It is the green flat and broad part
of the leaf. It is well adapted to absorb sunlight and carbon
dioxide for photosynthesis.
2: Leaf base- It is the part of leaf in contact with the node.
3:Petiole or leaf stalk-It is the stalk by which the leaf
lamina is attached to the main stem.
4:Midrib: The petiole enters into the lamina of the leaf and
continues as the Midrib
5: Veins: Midrib gives out numerous fine branches called
Veins
6: Veinlets: The veins Divide and subdivide to form a
network of Veinlets which keep the leaf expanded form
7: Leaf apex: The tip of the lamina is called the leaf apex
8:Leaf margin: The edge on all sides is called Leaf Margin
6. Simple leaves
The leaves in which the
lamina is undivided is a
single piece are called
simple leaves. In these
leaves, various margin
incisions, if present, never
touch the midrib
7. Compound leaves
The leaves in which the lamina is
divided into small segments
which are attached to the midrib
(rachis) and its branches or tip of
of the petiole are called
compound leaves. In these,
leaves incisions reach up to the
midrib or the petiole .
8. Venation
The arrangement of veins and veinlets in a
leaf is known as venation. It is of two types:
(i)Reticulate venation
(ii)Parallel venation
9. Reticulate venation
When the veins and
veinlets are irregularly
distributed in the lamina of
the leaf forming a network,
it is known as reticulate
venation.example- Peepal
and Mango
10. Parallel venation
When veins and
veinlets run parallel
to each other
towards the tip of
the leaf it is known
as parallel venation
11. Phyllotaxy
The arrangement of leaves on the
stem is called Phyllotaxy. It prevents
overcrowding of leaves and helps in
better exposure of leaf to sunlight and
air
13. Opposite phyllotaxy
If two leaves are borne
one on either side of the
same node, the
phyllotaxy is said to be
opposite. e.g., Tulsi,
jasmine, guava.
14. Alternate phyllotaxy
If the single leaf is born
alternately, one at each
node, it is called
alternate phyllotaxy.
e.g., Rose, castor,
peepal, china rose,
sunflower.
15. Whorled Phyllotaxy
If three or more leaves
are borne at each node,
the arrangement is
called whorled. e.g.,
Kaner, oleander
(Nerium).
16. FUNCTIONS OF LEAF
(i ) Photosynthesis : The process by which green plants prepare their food with the
help of carbon dioxide and water in the presence of sunlight and chlorophyll is
known as photosynthesis.
(ii ) Exchange of gases : Stomata present in the leaves help in the exchange of gases
for photosynthesis and respiration.
(iii ) Transpiration : The removal of excess of water from the plants in the form of
water vapours through stomata is called transpiration.
(iv) Reproduction : In some plants, leaves have buds and these buds produce new
plants. e.g., Bryophyllum.
(v) Storage : The leaves of some plants become fleshy to store food. e.g., Onion.
17. MODIFICATION OF LEAVES
Along with the important vital function
of leaf, i.e., photosynthesis, leaves of
certain plants get modified to perform
some additional functions to cope up
with the needs of environment. It is of
following types :
18. (i ) Leaf tendril : In some weak stemmed plants, either the
whole leaf or leaflet or some other parts may be modified
into tendril. In sweet pea plant, the terminal leaflets are
modified into tendril to climb a support or to expose their
leaves to sunlight. e.g., Pea and Lathyrus (whole leaf),
Gloriosa (leaf tip), Smilax (stipular tendril).
19. (ii) Spines : The leaves are modified to hard
pointed spines to reduce water loss. They
also protect the plant from grazing animals.
e.g., Asparagus, opuntia (cactus), prickly
pear etc.
20. (iii ) Phyllode : In Australian acacia, a very much
divided lamina falls off to reduce transpiration. The
petiole then becomes expanded into a green, flat,
leaf-like photosynthetic structure. It is called
the phyllode. It helps in conservation of water and
reducing water loss.
21. (iv) Hooks : In Bignonia, terminal leaflets
become modified into hooks for climbing on
the support. The hooks give the appearance
of the claws of a cat.
22. (v) Scale leaves : These are dry, brown,
membranous, non-photosynthetic leaves which
take a protective role and are present on nodes
of aerial stem (e.g., Ruscus, Asparagus) or
underground stem (e.g., Ginger).
23. (vi ) Pitcher plant : In Nepenthes khasiana, lamina becomes modified into a
pitcher to capture insects for supplementing nitrogen supply. The leaf tip
forms the lid and the petiole becomes a long, thin, coiled structure supporting
the pitcher. Along the edges of the opening of the pitcher are placed small
hooks. An insect is trapped in the pitcher and digested by the secretion of
enzymes into the sac. The slender structure at its lower end is a modified leaf
base. The leaf base is green, flattened and photosynthetic.
24. (vii) Bladder : In Utricularia, some of the leaf
segments become modified to form a sac-like
bladder leaving a small aperture. The insects
enter through this opening and are digested
by the secretion of enzymes
25. (viii) Venus flytrap : In case of Venus flytrap, leaf
blade is divided into two parts, hinged along the
midrib. The two parts get interlocked by
marginal teeth and prevent the insect from
escaping. e.g., Venus flytrap.
26. VEGETATIVE PROPAGATION IN LEAF
In some plants, leaves are modified to bear
foliar buds from which new plants grow
and develop e.g., Bryophyllum (Sprout-leaf
plant) and Begonia (Elephant-ear plant)
27. • The leaf in Bryophyllm plant is broad and
has notches at its margin.
• Buds arise from the notches. These Buds
are called Epiphyllous buds
• When the buds drop off from the leaves
and paced in soil, they develop into new
plants with roots and small leaves. The
vegetative propagation in Begonia is also
in the similar way.