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Ask QuestionPosted by Janu Bhuya 4 years ago
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Posted by Naina Sahu 4 years ago
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Posted by Naina Sahu 4 years ago
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Somay Mamgain 4 years ago
Posted by Naina Sahu 4 years ago
- 2 answers
Yogita Ingle 4 years ago
It is difficult to pull out the husk of a coconut tree because it is made up of sclerenchyma tissues which are dead cells. This gives rigidity and stiffness.
Posted by Subhransu Sahoo 4 years ago
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Manyata Joshi 4 years ago
Posted by Keshav Rattan 4 years ago
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Manyata Joshi 4 years ago
Somay Mamgain 4 years ago
Posted by Einstein 4 years ago
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Manyata Joshi 4 years ago
Gaurav Seth 4 years ago
In unicellular organisms, the cell is capable of performing the different life processes with the help of the different cellular organelles. The division of labour in multicellular organisms refers to the presence of different organ systems that are incharge of taking care of a particular life process. For example, the respiratory system, helps the body in obtaining oxygen from the air and supplying it to the rest of the body.
Posted by Diya Jogi 4 years ago
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Chhavi Sonkusre 4 years ago
Gaurav Seth 4 years ago
Lysosomes can be termed as waste disposal system of the cell. For almost all type of organic materials they contain digestive enzymes. For example, when cell gets damaged, lysosome may burst and the enzymes digest their own cell. Therefore lysosomes are known as the Suicidal bags of a cell or we can say that they posses different kind of hydrolases on release of these enzymes that cause death of cell.
Manyata Joshi 4 years ago
Posted by Prajwal G N 4 years ago
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Gaurav Seth 4 years ago
Golgi body is called the traffic police of cell because it acts as a way station or a assembly area for the storage ,processing and packaging for various cellular secretions. It also packages material synthesised by cell and dispatch them either to intracellular or extra cellular targets such as zymogens.
Manyata Joshi 4 years ago
Posted by Chitralekha Khaund 4 years ago
- 2 answers
Gaurav Seth 4 years ago
| Intercropping | Mixed Cropping |
| The main objective is to utilise the space left between the rows of the main crop | The main objective here is to get at least one crop in a favourable condition |
| Specific planting pattern followed | No planting pattern followed |
| Different fertilizers and pesticides are used for different crops | Same fertilizers and pesticides used for all the crops |
| Seeds aren’t mixed before sowing | Seeds are mixed before sowing |
| Followed to increase the productivity of crops | Followed to reduce the risk of crop failures due to unfavourable climatic conditions |
| There is a considerable difference in the life cycle and the duration of maturity in different crops | All crops have a similar life cycle and duration of maturity |
Posted by Chitralekha Khaund 4 years ago
- 1 answers
Manyata Joshi 4 years ago
Posted by Chitralekha Khaund 4 years ago
- 4 answers
Gaurav Seth 4 years ago
Desirable agronomic characteristics for crop improvements are:
(a) Tallness and profuse branching are desirable characters for fodder crops.
(b) Dwarfness is desired in cereals, so that less nutrients are consumed by these crops.
Manyata Joshi 4 years ago
Manyata Joshi 4 years ago
Posted by Shivani Singh Rajput 4 years ago
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Yogita Ingle 4 years ago
The continuity of features from one generation to another is known as heredity. It is also defined as the transmission of traits from parents to the offsprings.
A gene is a small portion of the DNA, with codes for a particular polypeptide or a protein. In other words, it is the functional unit of the DNA. It is also responsible for the transmission of hereditary characters from the parents to the offspring.
Posted by Sanjana Singh 4 years ago
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Yogita Ingle 4 years ago
There are the following different types of plant breeding:
Backcrossing
In this, a plant with desired traits is crossed with a plant that does not have the desired traits but has several other traits.
Inbreeding
In this, self-fertilization occurs. The progeny produced is the same generation after generation. This helps to preserve the original traits.
Hybrid Breeding
In this, two different breeds are crossed to produce the offspring that is more productive than the parents.
Mutation Breeding
The mutations in plant genes result in new varieties. Mutations can also be induced in plants by exposing them to chemicals and radiation.
Posted by Bhumika Jaiswal 4 years ago
- 2 answers
Rohan Nayma 4 years ago
Yogita Ingle 4 years ago
Colloids as a mixture where one of the substances is split into very minute particles which are dispersed throughout a second substance. The minute particles are known as colloidal particles.
Examples of Colloids
1) Blood:
A respiration pigment which has albumin protein in water. Pigment part contains albumin that acts as the dispersed phase and the dispersion medium is water. It is a hydrosol.
2) Cloud:
It contains air which is the dispersion medium and droplets of water as a dispersed phase. These are aerosol.
3) Gold sol:
It is a metallic sol in which gold particles are dispersed in the water.
Posted by Trishla Jain 4 years ago
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Diya Jogi 4 years ago
Trisha Verma 4 years ago
Ansh Nandan 4 years ago
Manyata Joshi 4 years ago
Posted by Premanshu Shah ???? 4 years ago
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《Aruba》°°° 《Sayed》❤ 4 years ago
Posted by Premanshu Shah ???? 4 years ago
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Yogita Ingle 4 years ago
The combining capacity of an atom is known as its valency. The number of bonds that an atom can form as part of a compound is expressed by the valency of the element.
As we know, the number of electrons in the outermost shell of hydrogen is 1, and in magnesium, it is 2. Therefore, the valency of hydrogen is 1 as it can easily lose 1 electron and become stable. On the other hand, that of magnesium is 2 as it can lose 2 electrons easily and also attain stability.
Posted by Afrina Asmi 4 years ago
- 1 answers
Yogita Ingle 4 years ago
A change which occurs without a change in the composition and chemical nature of the substance is called a physical change. It means that there is a change only in the physical properties of the substance. Properties like colour, hardness, rigidity, fluidity, density, melting point and boiling point are known as physical properties. Melting of ice or boiling of water is a physical change because ice, water and water vapours are chemically the same substance that is H2O.
Posted by Virendrasingh Tanwar 4 years ago
- 1 answers
Yogita Ingle 4 years ago
An oxidizing agent (oxidant), gains electrons and is reduced in a chemical reaction. It is also known as electron acceptor. The oxidizing agent is usually in one of its higher possible oxidation states as it will gain electrons and be reduced.
Examples of oxidizing agents are:
- potassium nitrate
- halogens
- nitric acid
A reducing agent (reductant), loses electrons and is oxidized in a chemical reaction. It is typically in one of its lower possible oxidation states and is known as an electron donor. A reducing agent is oxidized because it loses electrons in the redox reaction.
Examples of reducing agents are:
- formic acid
- the earth metals
- sulfite compounds
Posted by Nitish Kumar 4 years ago
- 1 answers
Posted by Swayam Deep 4 years ago
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Rohan Nayma 4 years ago
Akshita Jain 4 years ago
Yogita Ingle 4 years ago
The process of centrifugation is used in dairies to separate cream from milk .
Centrifugation is a method for separating the suspended particles of a substance from a liquid in which the mixture is rotated at a high speed in a centrifuge machine.
The milk is put in a closed container in big centrifuge machine .
when the centrifuge machine is switched ON, the milk is rotated at very high speed in a container.
Due to this process, milk separates into cream and skimmed milk.
The cream being lighter floats over the skimmed milk
Meghna Thapar 4 years ago
Milk is a suspension of tiny droplets of oil (cream) in a watery liquid. The process of centrifugation is used to separate cream from milk. The milk is put in a close container in big centrifuge machine. When the centrifuge machine is switched on, the milk is rotated (or spun) at a very high speed in its container. The centrifugal force acts on the milk and due to this, the milk separates into cream and skimmed milk. The cream, being lighter, floats over the skimmed milk and can then be removed.
Answered by | 8th May, 2014, 11:19: AM
Posted by Prachi Verma 4 years ago
- 3 answers
Yash Joshi 4 years ago
Yogita Ingle 4 years ago
- Parenchyma, collenchyma and sclerenchyma are three types of simple tissues. Xylem and phloem are types of complex tissues.
Meghna Thapar 4 years ago
- Permanent Tissues:
When the cells take up a specific role and lose the ability to divide they form a permanent tissue. This process of taking up a permanent shape, size, and a function is called differentiation. Thus, cells of meristematic tissue differentiate to form different types of permanent tissue.
Permanent tissues are of two types – simple permanent tissues and complex permanent tissues.
Simple permanent tissues are composed of cells which are structurally and functionally similar. They are of three types – parenchyma, collenchyma and sclerenchyma.
- Parenchyma –
Parenchyma tissue consists of relatively unspecialised cells with thin cell walls. They are live cells. They are usually loosely packed, so that large spaces between them. This tissue provides support to plants and also stores food. In some cases, it contains chlorophyll and performs photosynthesis, and then it is called as chlorenchyma. In aquatic plants, large air cavities are present in parenchyma to give buoyancy to the plants to help them float. Such a parenchyma type is called aerenchyma. The parenchyma of stems and roots also stores nutrients and water.
ii. Collenchyma –
The cells of collenchyma tissue are living, elongated and irregularly thickened at the corners. There is very little or no intercellular space. It allows easy bending in various parts of a plant (leaf, stem) without breaking. Thus, provides flexibility to the plant. It also provides mechanical support to plants.
iii. Sclerenchyma –
The cells of sclerenchyma tissue are dead. They are long and narrow as the walls are thickened due to deposition of lignin. The walls of cells are so thick that there is no internal space inside the cell. This tissue is present in stems, around vascular bundles, in the veins of leaves and in the hard covering of seeds and nuts. It provides strength to the plant parts and makes the plant hard and stiff.
Posted by Sunita Tirole 4 years ago
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Posted by Ariba Bano Class 10 4 years ago
- 2 answers
Yogita Ingle 4 years ago
|
KHARIF CROPS |
RABI CROPS |
|
Kharif crops are sown with the beginning of the rainy season. |
Rabi crops are sown after the end of the monsoon, i.e. during the winter season. |
|
They require huge amount of water and hot weather to grow. |
They require warm climate for seed germination and cold climate to grow. |
|
They require shorter day length. |
They require longer day length. |
|
Sowing month is from June – July. |
Sowing month is from October – November. |
|
Harvesting month is from September - October |
Harvesting month is from March - April |
|
Examples: Rice, maize, cotton, groundnut, jowar, bajra, etc. |
Examples: Wheat, peas, gram, oilseeds, barley, etc. |
Ananya K 4 years ago
Posted by Vineeta Verma 4 years ago
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Vineeta Verma 4 years ago
Posted by Rimjhim Chaurasiya 4 years ago
- 5 answers
Nitya Gupta 4 years ago
Yogita Ingle 4 years ago
When the object has density less than 1 g cm-1 then it floats on the surface of water, because, it always displaces more weight of water than its own weight. As buoyant force is more than its own weight, therefore, it floats. When the object has density more than 1 g cm-3 then it sinks in water, because it always displaces less weight of water than its own weight. As buoyant force is less than its own weight, therefore, it sinks.
Palak Kesharwani 3 years, 11 months ago
Posted by Rishabh Pandey 4 years ago
- 1 answers
Yash Yadav 4 years ago
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