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Ask QuestionPosted by Ganpat Ray 4 years, 11 months ago
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Posted by Dhruvraj Gohil 4 years, 11 months ago
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Yogita Ingle 4 years, 11 months ago
Features of parenchyma:
- They form basic packing tissue.
- Cells of this tissue are relatively unspecialised and may be oval, rounded or elongated in shape.
- Their cell walls are thin.
- These cells are living.
- They show large intercellular spaces.
- Cytoplasm is dense with a small nucleus.
- The celss possess a large central vacuole.
- Parenchyma provides support to plants and also stores food
Features of Sclerenchyma:
- Their cells are dead.
- Cells are long and narrow.
- Cells are empty and devoid of protoplasm.
- Cell walls are highly thickened due to lignin deposition.
- There is no internal space inside the cell.
- Cells are closely packed, with no intercellular spaces.
- It is a strengthening or mechanical tissue.
Features of collenchyma:
- They possess living cells.
- It shows deposition of extra cellulose at the corners of the cells.
- Intercellular spaces are generally absenjt.
- Their cells are elongated in shape.
Posted by Dhruvraj Gohil 4 years, 11 months ago
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Yogita Ingle 4 years, 11 months ago
Meristematic tissue is the plant tissue that has the ability to divide actively throughout its life.
The meristematic tissue is of the following types:
Meristematic Tissue On the basis of Origin
Promeristem
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The earliest and youngest meristematic tissue.
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It originates from the embryo.
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The primary meristem arises from the promeristem.
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It is found in the root and the shoot tips.
Primary Meristem
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It arises from the promeristem.
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Cells divide actively.
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It is present below the promeristem and forms the permanent tissue.
Secondary Meristem
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It originates from the primary meristem.
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The permanent tissue forms from the secondary meristem.
Meristematic Tissue On the Basis of Position
Apical Meristem
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These are present at the tips of the roots and shoots and helps in the increase of the height of the plants.
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Various cell divisions facilitate the growth of the cells in the roots and shoots and help in cellular enlargement.
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Apical meristem is divided into-promeristem zone, which contains actively dividing cells, and the meristematic zone, which contains protoderm, procambium and ground meristem.
Intercalary Meristem
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It is located in the leaves and internodes at the intercalary position.
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These help to increase the length of the internode.
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It is found in grass, monocots and pines.
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It is a part of apical meristem and adds to the height of the plant.
Lateral Meristem
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It is located in the stems and roots on the lateral side.
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It increases the thickness of the plant.
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Vascular cambium and cork cambium are the two lateral meristems.
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These divide preclinically or radially and give rise to secondary permanent tissues.
Meristematic Tissue On the Basis of Function
Protoderm
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It is the outermost plant tissue and forms the epidermis.
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It protects the plants from any mechanical shocks.
Procambium
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It is the innermost tissue and gives rise to xylem and phloem.
- It helps in the transport of water and nutrients to different parts of the plant.
Ground Meristem
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The cells are large with thick walls.
- It forms the cortex, pericycle and pith.
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Posted by Abhyudaya Sinha 4 years, 11 months ago
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Posted by Anushka Verma 4 years, 11 months ago
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ᵗʰⁱˢ ᵍⁱʳˡ ⁱˢ ༒︎Dᴇᴀᴅ Iɴsɪᴅᴇ༒︎✔︎ 4 years, 11 months ago
Posted by Ritika Jangra 4 years, 11 months ago
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Posted by Anshul Rana 4 years, 11 months ago
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Gaurav Seth 4 years, 11 months ago
Let the mass of an object be m. Let its weight on the moon be Wm. Let the mass of the moon be Mm and its radius be Rm. By applying the universal law of gravitation, the weight of the object on the moon will be
Let the weight of the same object on the earth be We. The mass of earth is M and its radius is R.
Substituting the values in equations (1) and (2) we get
Dividing equation (3) by (4)
Posted by Neha Jangid ??? 4 years, 11 months ago
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Posted by Neha Jangid ??? 4 years, 11 months ago
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Posted by Amy Purple 4 years, 11 months ago
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Tillu Yadav 4 years, 11 months ago
Meghna Thapar 4 years, 11 months ago
Cells divide and reproduce in two ways, mitosis and meiosis. Mitosis results in two identical daughter cells, whereas meiosis results in four *** cells. Mitosis gives identical cells to each other and to the mother cell, while meiosis leads to genetic variation due to crossing over and independent assortment. Mitosis gives nuclei with the same number of chromosomes as the mother cell while meiosis gives cells with half the number.
Posted by Shagun Panwar 4 years, 11 months ago
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Payal Nandini 4 years, 11 months ago
Jividha Kumar 4 years, 11 months ago
Yogita Ingle 4 years, 11 months ago
Centrifugation is a technique used in a washing machine to squeeze out water from wet clothes while drying.
Gaurav Seth 4 years, 11 months ago
Which technique is used in a washing machine to squeeze out water from wet clothes while drying ?
SOLUTION
Centrifugation is a technique used in a washing machine to squeeze out water from wet clothes while drying.
Posted by Hoikhanmoi Guite 4 years, 11 months ago
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ᵗʰⁱˢ ᵍⁱʳˡ ⁱˢ ༒︎Dᴇᴀᴅ Iɴsɪᴅᴇ༒︎✔︎ 4 years, 11 months ago
Posted by Joyeeta Mondal 4 years, 11 months ago
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Meghna Thapar 4 years, 11 months ago
Meristematic tissues are growth tissues and found in the growing regions of the plant. According to their position in plant, meristems are apical, lateral and intercalary.
- Apical meristem - Apical meristem is present at the growing tips of stems and roots and increases the length of the stem and the root.
- Lateral meristem – Lateral meristems are found beneath the bark. The girth of the stem or root increases due to lateral meristem (cambium).
- Intercalary meristem - Intercalary meristem is the meristem at the base of the leaves or internodes (on either side of the node) on twigs. It increases the length of the organs such as leaves and internodes.
Posted by Joyeeta Mondal 4 years, 11 months ago
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Yogita Ingle 4 years, 11 months ago
The parenchyma is widely distributed in plant body such as stem , roots, leaves, flowers and fruits.
The parenchyma tissue is found in the soft parts of the plants such as cortex of roots, ground tissue in stems & mesophyll of leaves.
It is also distributed in pith , medullary rays & packing tissue in xylem and phloem.
They forms the bulk of the plant body they are living and possesses the power of their division. Parenchyma cells have living Protoplasm.
Posted by Joyeeta Mondal 4 years, 11 months ago
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Yogita Ingle 4 years, 11 months ago
| Golgi Bodies vs Mitochondria | |
| Golgi Bodies are a type of organelles in eukaryotic cells. They are stacks of flattened membranes and vesicles. | Mitochondria are organelles in eukaryotic cells They are of bean shape, double membranous organelles. |
| Major Function | |
| Involve in modifying, sorting and packaging of proteins for secretion. | Produce energy currency (ATP) of the cell. |
| DNA | |
| Do not have DNA. | DNA is available. |
| Number of Membranes Surrounding the Organelle | |
| Single membrane organelles. | Double membrane bound organelles. |
| Shape | |
| Stacks of flattened membranous sacs or cisternae. They appear as a maze. | Bean-shaped organelles. |
Posted by Tanusha Noushad 4 years, 11 months ago
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Ishita Budhwar 4 years, 11 months ago
Gaurav Seth 4 years, 11 months ago
Mixtures which do not have uniform composition throughout are called Heterogeneous Mixture. For example – mixture of soil and sand, mixture of sulphur and iron fillings, mixture of oil and water etc. The boundaries of constituent particles of a homogeneous mixture can be identified easily; as a homogeneous mixture has two or more distinct phases.
Posted by Likhith Manohar Vadapalli 4 years, 11 months ago
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Gaurav Seth 4 years, 11 months ago
mass of earth = 6 × 10²⁴ Kg
mass of sun = 2 × 10^30 Kg
distance between earth and sun = 1.5 × 10¹¹ m
F = GMm/r²
= 6.67 × 10-¹¹ × 6 × 10²⁴ × 2 × 10^30/(1.5 × 10¹¹)²
= { 6.67 × 6 × 2/2.25} × 10¹³ × 10^30× 10-²²
= 35.57 × 10²¹ N
= 3.557 × 10²² N
Posted by Vishesh Chahar 4 years, 11 months ago
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Arya Bharambe 4 years, 11 months ago
Posted by Chaitali 1612 4 years, 11 months ago
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Posted by Neha Jangid ??? 4 years, 11 months ago
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Posted by Ritika Jangra 4 years, 11 months ago
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Posted by Ritika Jangra 4 years, 11 months ago
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Posted by Umang Gupta 4 years, 11 months ago
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Shakti Kumar 4 years, 11 months ago
Yogita Ingle 4 years, 11 months ago
Centrifugation is the process that uses centrifugal force for the separation of two liquids in a mixture. In this process, the denser component of the mixture migrates away from the axis and the lighter component migrates towards the axis.
Let us understand this process with the example of milk, as the tubes containing the milk are rotated, the heavier milk is pulled outward against the wall, whereas, the lighter cream is collected in the middle. Both the components are then collected separately.
Alka Yadav 4 years, 11 months ago
Posted by Learningqueen Nikita 4 years, 11 months ago
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Yogita Ingle 4 years, 11 months ago
| These are solids at room temperature except mercury | These exist in all three states |
| These are very hard except sodium | These are soft except diamond |
| These are malleable and ductile | These are brittle and can break down into pieces |
| These are shiny | These are non-lustrous except iodine |
| Electropositive in nature | Electronegative in nature |
| Have high densities | Have low densities |
Posted by Joyeeta Mondal 4 years, 11 months ago
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Yogita Ingle 4 years, 11 months ago
- Tracheids are elongated tube-like dead cells with oblique end walls. The walls are hard and lignified. Vessels are placed one upon the other and their end walls are either absent or possess perforations.
- They help in conduction of water and minerals. Xylem parenchyma are living parenchymatous cells present in the xylem. They help in the lateral conduction of organic solutes and the storage of food reserves.
- Xylem fibers are lignified fibers present in the xylem which provide mechanical strength to the plant body.
Posted by Athresh M Kumar 4 years, 11 months ago
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Posted by Tanmay Goyal 4 years, 11 months ago
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Yogita Ingle 4 years, 11 months ago
Properties of solids
- Solid has fixed volume.
- Solid has fixed shape.
- Solid has high density.
- Solids are heavy.
- Solid does not flow.
Properties of liquid
- Liquid has definite volume.
- Liquid has no definite shape.
- Liquid gets the shape of container in which it is kept.
- Liquid cannot be compressed much.
- Liquid has less density compare to solid.
- Liquid is lighter than solid.
- Liquid flows and hence is called fluid.
Properties of gas
- Gas has indefinite shape
- Gas has no fixed volume.
- Gas gets the shape and volume of container.
- Gas fills the container completely.
- Gas has very low density.
- Because of low density gas are light.
- Gas can flow easily and hence are called fluid.
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