Ask questions which are clear, concise and easy to understand.
Ask QuestionPosted by Anvesha Baranwal 4 years, 2 months ago
- 2 answers
Gaurav Seth 4 years, 2 months ago
| Xylem | Phloem |
| 1. It conducts water and minerals from roots to leaves. | 1. It conducts food from leaves to all parts of the plant. |
| 2. It is composed of mainly dead elements. | 2. It is composed of mainly living elements. |
| 3. Transport is unidirectional. | 3. Transport is bidirectional. |
| 4. It has four types of cells: Tracheids, Vessels, Xylem parenchyma and Xylem fibres. | 4. It has four types of cells: Phloem fibres, Sieve tubes, Companion cells and Phloem parenchyma. |
Posted by Anvesha Baranwal 4 years, 2 months ago
- 2 answers
Sarita Panda 4 years, 2 months ago
Gaurav Seth 4 years, 2 months ago
a n s w e r :
The tissue in leaf stalks below the epidermis is collenchyma. It has the living, elongated cells with irregularly thickened corners and little intercellular space.
Posted by Priyanshu Negi 4 years, 2 months ago
- 1 answers
Posted by Shraddha Verma 4 years, 2 months ago
- 2 answers
Yogita Ingle 4 years, 2 months ago
The acceleration of free fall is; when the Body falls due to earth’s gravitational pull, its velocity changes and is said to be accelerated due to .the earth’s gravity and it falls freely called as free fall. This acceleration is calculated to be 9.8 m/s2.
Suzanne Smitha 4 years, 2 months ago
Posted by Rakhi Sharma 4 years, 2 months ago
- 2 answers
Abhinav Anand Anand 4 years, 2 months ago
Yogita Ingle 4 years, 2 months ago
| Properties | Pure Substance | Mixture |
| Define | The substances that are made of one matter are called pure substances | Several substances together form a mixture |
| Categorize | Solid, liquid, gas | Heterogeneous, homogeneous |
| Physical properties | Constant | Vary |
| Purity | Pure | Impure |
| Separation by a physical process | Not possible | Possible to separate by evaporation, magnetic separation, etc. |
| Chemical properties | Constant | Vary |
| Example | Gold, pure water, hydrogen gas | Oil & water, sand & sugar |
Posted by Niyati Yadav 4 years, 2 months ago
- 5 answers
Yogita Ingle 4 years, 2 months ago
Sorry bi-mistake added
Correct answer is
Dr Varghese Kurien is the person who transformed rural India and made India the largest producer of milk. Also known as the Milkman of India, Dr Kurien’s endless efforts has alleviated millions of rural Indian out of poverty.
Meghna Thapar 4 years, 2 months ago
The White Revolution in India, also known as Operation Flood was launched in 1970s to make India self dependent in milk production. Dr Verghese Kurien is known as the father of The White Revolution in India. Verghese Kurien (26 November 1921 – 9 September 2012), known as the 'Father of the White Revolution' in India, was a social entrepreneur whose "billion-litre idea", Operation Flood, the world's largest agricultural dairy development program, made dairy farming India's largest self-sustaining industry.
Posted by Lakshmi Lakshmi 4 years, 2 months ago
- 2 answers
Sarita Panda 4 years, 2 months ago
Meghna Thapar 4 years, 2 months ago
Some stars are closer to the Earth than others. Why is it that some stars appear to have color while other simply appear to be white? The color receptors in our eyes are not sensitive enough to detect color in fainter stars and as a result only the brightest stars in the sky appear to have color. It seems that the stars with 'cooler' temperatures have energy that is radiated in the red tones of the electromagnetic color spectrum, while those with 'hotter' temperatures had energy that is radiated in the blue and white tones of the electromagnetic color spectrum.
Posted by Avinash Kumar 4 years, 2 months ago
- 2 answers
Meghna Thapar 4 years, 2 months ago
Air is nothing but a mixture of a variety of gasses. The air in the atmosphere consists of nitrogen, oxygen, which is the life-sustaining substance for animals and humans, carbon dioxide, water vapour and small amounts of other elements (argon, neon, etc.). Air is the general name for the mixture of gases that makes up the Earth's atmosphere. This gas is primarily nitrogen (78%), mixed with oxygen (21%), water vapor (variable), argon (0.9%), carbon dioxide (0.04%), and trace gases.
Posted by Ravi Jatav 4 years, 2 months ago
- 4 answers
Madhusmita Sahu 4 years, 2 months ago
Suzanne Smitha 4 years, 2 months ago
Yogita Ingle 4 years, 2 months ago
- The length of the (Strait) shortest path between the initial and the final positions of a body is known as displacement.
- It is a vector quantity.
- Displacement can be 0, positive and negative
Posted by Madhav Manroa 4 years, 2 months ago
- 1 answers
Yogita Ingle 4 years, 2 months ago
The term "retradation" means negative acceleration.
Initial velocity =10m/s
Final velocity =0m/s
Time Taken=20s
Acceleration =0-10/20
Acceleration = -0.5m/s sq
Retardation =0.5m/s sq
Posted by Sara Khan 4 years, 2 months ago
- 3 answers
Kajal Sharma 4 years, 2 months ago
Gaurav Seth 4 years, 2 months ago
A n s w e r :
Average velocity would be equal to average speed when the total distance travelled equals the net displacement of a particle. This happens when a particle moves along a straight line in a fixed direction.
Yogita Ingle 4 years, 2 months ago
Speed is a scalar quantity having only magnitude and no direction while velocity is a vector quantity having magnitude and direction both.
The magnitude of average velocity of an object equal to its average speed when the motion of the object will be straight and unidirectional.
As, speed is scalar quantity and velocity is a vector quantity, so the object is required to move in straight line with same or constant direction.
Posted by Jaskaran Singh 4 years, 2 months ago
- 1 answers
Meghna Thapar 4 years, 2 months ago
All metals and some other elements, such as carbon, do not have a simple structure but consist of a very large and indefinite number of atoms bonded together. Their atomicity cannot be determined and is usually considered as Metals donot exist as simple metals, a large and indefinite number of atoms are joined together to form a three dimensional structure. Thus metals are polyatomic. Hence, there atomicity cannot be determined.
Posted by Arvind Kumar Shah 4 years, 2 months ago
- 1 answers
Madhav Manroa 4 years, 2 months ago
Posted by Adeeba Hashmi 4 years, 2 months ago
- 2 answers
Pankaj Gautam 4 years, 2 months ago
Rohit Kumar 4 years, 2 months ago
Posted by Ayush Ranjan 4 years, 2 months ago
- 3 answers
Zunaid Md 4 years, 2 months ago
Sujeet Yadav 4 years, 2 months ago
Posted by Shani Baiswade 4 years, 2 months ago
- 3 answers
Akshat Holland Minettee 4 years, 2 months ago
Yogita Ingle 4 years, 2 months ago
Compound is a pure substance made up of two or more elements combined chemically in a definite ratio.
Characteristics:
1. The properties of compound differ from those of its constituents.
2. Compound has fixed melting point and boiling point.
3. Compound is a homogeneous substance.
4. Constituent elements can be separated by chemical process.
Posted by Bajendar Kumar 4 years, 2 months ago
- 2 answers
Posted by Arihant Jain 4 years, 2 months ago
- 4 answers
Madhav Manroa 4 years, 2 months ago
Akshat Holland Minettee 4 years, 2 months ago
Rohit Kumar 4 years, 2 months ago
Yogita Ingle 4 years, 2 months ago
Acceleration
- Acceleration: It is a measure of the change in the velocity of an object per unit time.
- Acceleration can be caused either by change in direction of motion or change in speed or both.
Acceleration = Change in velocity/Time taken
- SI unit is ms-2.
- It is a vector quantity; the acceleration is taken to be positive if it is in the direction of velocity and negative when it is opposite to the direction of velocity.
Posted by Priyanshi Kumarisingh 4 years, 2 months ago
- 5 answers
Akshat Holland Minettee 4 years, 2 months ago
Bhagyesh Kame 4 years, 2 months ago
Posted by 조진 우 4 years, 2 months ago
- 2 answers
Bhagyesh Kame 4 years, 2 months ago
Yogita Ingle 4 years, 2 months ago
When the passenger in a train moving with a constant speed tosses a coin, the coin will fall back to the spot where it was tossed from as if the train was stationary. Because the coin is also moving with constant speed along with the train
Posted by Krisna Divedi 4 years, 2 months ago
- 2 answers
Yogita Ingle 4 years, 2 months ago
Movement of any object from one position to another position with respect to the observer is called as Motion.
When an object moves along a straight line, the motion of the object is called rectilinear motion. For example; motion of a car on highway
Posted by Jiya Pasare 4 years, 2 months ago
- 1 answers
Gaurav Seth 4 years, 2 months ago
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Chloroplasts are oval, spherical, disc-shaped or ribbon-shaped.
- They are 5-10 mm in length and 2-4 mm in width.
- It is a double-membraned organelle.
- The space enclosed by the inner membrane is filled with a semi-solid substance called stroma
- Flattened, membranous sacks called thylakoids are present in the stroma.
- The stroma contains several enzymes required for protein and carbohydrate synthesis, DNA, ribosomes and RNA.
- The thylakoids are arranged like stacks of coins. These stacks are called grana.
- Flat membranous tubules called stroma lamellae connect the thylakoids.
- The thylakoids contain space within them called a lumen.
Posted by Sourav Sandhu 4 years, 2 months ago
- 1 answers
Posted by Harleen Kaur 4 years, 2 months ago
- 3 answers
Bhagyesh Kame 4 years, 2 months ago
Yogita Ingle 4 years, 2 months ago
The process by which the cell engulfs some of its extracellular fluid (ECF) including material dissolved or suspended in it, is known as endocytosis.The flexibility of the cell membrane enables the cell to engulf by invaginating and pinching off, forming a membrane-bounded vesicle called an endosome.
Amoeba acquires its food by endocytosis.
Suzanne Smitha 4 years, 2 months ago
Posted by Harleen Kaur 4 years, 2 months ago
- 4 answers
Gaurav Seth 4 years, 2 months ago
(i) Nucleus has double layer covering called nuclear membrane which has pores that allows the transfer of materials from inside the nucleus to its outside.
(ii) It directs the chemical activities of the cell.
(iii) It determines the way, the cell will develop and the form it will exhibit at maturity.
(iv) It plays an important role in cell division.
(v) It plays a central role in cellular reproduction.
(vi) Nucleus has chromosomes which contains information for the inheritance of features from parents to next generation.
Suzanne Smitha 4 years, 2 months ago
Suzanne Smitha 4 years, 2 months ago
Posted by Naziya Ppns 4 years, 2 months ago
- 5 answers
Harleen Kaur 4 years, 2 months ago
Gaurav Seth 4 years, 2 months ago
Given,
Velocity = 72 km/hr
So,
Velocity in m/s will be given by,
v =
Posted by Janhavi Singh 4 years, 2 months ago
- 2 answers
Lucky Girl Lucky 4 years, 2 months ago
Gaurav Seth 4 years, 2 months ago
- Temperature: Solubility of a solid solute increases with increase in temperature.
Solubility of a gas solute decreases with increase in temperature.
Solubility of a gas solute increases with increase in pressure.
Posted by Janhavi Singh 4 years, 2 months ago
- 3 answers
Gaurav Seth 4 years, 2 months ago
If a saturated solution is heated, then it becomes unsaturated because solubility of solute increases on heating .
If a saturated solution is cooled, then some of its dissolved solute will separate out in the form of solid crystal s .
Posted by Navin Jaiswal 4 years, 2 months ago
- 5 answers
Gaurav Seth 4 years, 2 months ago
Cytology is the study of individual cells of the body. Cytology is the medical and scientific study of cells. Cytology refers to a branch of pathology, the medical specialty that deals with making diagnoses of diseases and conditions through the examination of tissue samples from the body.
Posted by Tarini Sahu 4 years, 2 months ago
- 3 answers
Gaurav Seth 4 years, 2 months ago
Diffusion is important as it allows cells to get oxygen and nutrients for survival. In addition, it plays a role in cell signaling, which mediates organism life processes.Diffusion is important for several reason are ;
- It promotes cellular respiration - In order for cells to survive, they need oxygen.
- Oxygen moves from areas of high concentration to low concentration, allowing the cell to respirate.
Nutrients pass through to cells - Cells need nutrients, such as glucose, to survive. Diffusion allows these nutrients to pass through to cells according to their needs.
Shreyansh Jain 4 years, 2 months ago
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Damini Umarvaishy 4 years, 2 months ago
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