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💈Tissues💈
Tissues are categorized as −
Plant Tissue
Animal Tissue
♦️Plant Tissue
Following are the major types of plant tissue −
➖Meristematic Tissues
➖Permanent Tissues
▪️Simple Permanent Tissues
➖Parenchyma
➖Collenchyma
➖Sclerenchyma
➖Epidermis
▪️Complex Permanent Tissue
➖Xylem
➖Phloem
▪️Meristematic Tissue
➖Meristematic tissue mainly consists of actively dividing cells, and helps in increasing the length and thickening the stems of the plant.
➖Meristematic tissue, commonly, present in the primary growth regions of a plant, for example, in the tips of stems or roots.
➖Depending on the region (where the meristematic tissues are found); meristematic tissues are classified as apical, lateral, and intercalary (see the image given below).
➖Apical meristem (as shown in the above image) is present at the growing tips of stems and roots and helps in their growth.
➖Lateral Meristem is found in stem or root region and helps in their growth.
➖Intercalary meristem is found at the base of the leaves or internodes (on twigs) and helps in growth.
🔸Permanent Tissue
Cells of meristematic tissue later differentiate to form different types of permanent tissue.
Permanent Tissue is further categorized as −
➖Simple Permanent Tissue and
➖Complex Permanent Tissue
🔸Simple Permanent Tissue
Simple Permanent Tissue further categorized as −
➖Parenchyma
➖Collenchyma
➖Sclerenchyma
➖Epidermis
🔸Parenchyma tissue provides support to plants and also stores food.
🔸Sometimes, parenchyma tissue contains chlorophyll and performs photosynthesis, in such a condition, it is known as collenchyma.
🔸The collenchyma tissue provides flexibility to plant and also provides mechanical support (to plant).
🔸The large air cavities, which are present in parenchyma of aquatic plants, give buoyancy to the plants and also help them float, are known as aerenchyma.
🔸The Sclerenchyma tissue makes the plant hard and stiff. For example, the husk of a coconut is made up of sclerenchymatous tissue.
🔸The cells of Sclerenchyma tissue normally are dead.
🔸The outermost layer of cells is known as epidermis.
🔸The epidermis is usually made up of a single layer of cells.
🔸The entire surface of a plant has the outer covering of epidermis, which protects all the parts of the plant.
🔷Complex Permanent Tissue
The complex tissue, normally, consists of more than one type of cells which work together as a unit.
Complex tissues help in the transportation by carrying organic material, water, and minerals up and down in the plants.
🔸Complex Permanent Tissue is categorized as;
➖Xylem
➖Phloem
🔸Xylem, normally, consists of tracheid, vessels, xylem parenchyma, and xylem fibers.
🔸Xylem is accountable for the conduction of water and mineral ions/salt.
🔸Phloem, normally, is made up of four types of elements namely −
➖Sieve tubes
➖Companion cells
➖Phloem fibers and
➖Phloem parenchyma
🔸Phloem tissue transports food from leaves to other parts of the plant.
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👉CLASS 11👈
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Chapter 1 – Physical World
Chapter 2 – Units and Measurement
Chapter 3 – Motion in a Straight Line
Chapter 4 – Motion in a Plane
Chapter 5 – Law of Motion
Chapter 6 – Work, Energy, and Power
Chapter 7 – Systems of Power and Rotational Motion
Chapter 8 – Gravitation
Chapter 9 – Mechanical Properties of Solids
Chapter 10 – Mechanical Properties of Fluids
Chapter 11 – Thermal Properties of Matter
Chapter 12 – Thermodynamics
Chapter 13 – Kinetic Energy
Chapter 14 – Oscillations
Chapter 15 – Waves..
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The motion of a particle executing simple harmonic motion is given by X = 0.01 sin 100p (t + 0.05), where X is in metres ant t in second. The time period in second isAnonymous voting
- 0.01
- 0.02
- 0.1
- 0.2
Length of a simple pendulum executing simple harmonic motion is increased by 21%. The percentage increase in the time – period of the pendulum of increased length isAnonymous voting
- 10 percent
- 1 percent
- 21 percent
- 42 percent
One of the two clocks on the earth is controlled by a pendulum and other by a spring. If both the clocks are taken to the moon, then which clock will have the same time – period of the earth?Anonymous voting
- Spring clock
- Pendulum clock
- Both
- None
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