•  A stain of curry on white cloth becomes reddish brown when soap is rubbed because curry contain turmeric which is a natural indicator whereas soap is basic in nature. when turmeric react with soap it turn into reddish brown.
•  When it is washed in water it turns yellow because when turmeric comes in contact with water which is neutral it becomes very dilute and reactions stops.

 When quicklime (calcium oxide) is added to water filled in a bucket, they react chemically to form slaked lime (calcium hydroxide) and produce heat energy. So, water in the bucket becomes hot.

CaO + H₂O  → Ca(OH)₂ + Heat

what happens chemically when quicklime is added to water filled in a bucket?

When Calcium oxide i.e. quick lime is added to water filled in a bucket, it reacts vigorously with water to produce slaked lime (calcium hydroxide) releasing a large amount of heat.

In Amoeba, asexual reproduction occurs by fission (binary7 and multiple). In Amoeba, nucleus first divides into two daughter nuclei by mitosis and then body along with the cytoplasm constricts from the middle, which gradually deepens and eventually divides into two individual parts, each part has one nucleus. Thus, two daughter Amoebae develop from one. This is called binary fission.
In multiple fission, nucleus repeatedly divides to form a large number of nuclei, which reach at the periphery. Later cytoplasm gathers around each nucleus to form a daughter Amoeba. In this process, several individuals (equal to number of nuclei) develop from a single Amoeba.

<a data-download-href="https://ask.learncbse.in/uploads/db3785/28a3b3bc8a0179c211c625de51ef5c564b638f5f" href="https://ask.learncbse.in/uploads/db3785/original/2X/2/28a3b3bc8a0179c211c625de51ef5c564b638f5f.jpg" title="image.jpg"></a>

Newton’s 1st law states that a body at rest or uniform motion will continue to be at rest or uniform motion until and unless a net external force acts on it.

Newton’s 2nd law states that the acceleration of an object as produced by a net force is directly proportional to the magnitude of the net force, in the same direction as the net force, and inversely proportional to the mass of the object.

The Newton’s 3rd law states that for every action there is an equal and opposite reaction.

10 Science notes Chapter 1 Chemical Reactions and Equations

Download CBSE class 10th revision notes for chapter 1 Chemical Reactions and Equations in PDF format for free. Download revision notes for Chemical Reactions and Equations class 10 Notes and score high in exams. These are the Chemical Reactions and Equations class 10 Notes prepared by team of expert teachers. The revision notes help you revise the whole chapter in minutes. Revising notes in exam days is on of the best tips recommended by teachers during exam days.

Click on the given link:

We all must have observed newly bought iron, silver or copper articles appears very shiny but with the passage of time they get dull. This is due to the layer of metal oxide that develops on its surface. Rusting of iron, silver jewelry getting tarnished, or copper articles getting covered by a green layer. Metals react with atmospheric oxygen and produces metal oxides that are basic in nature because they react with water to form bases.

• In case of rusting of iron, the iron reacts with the oxygen present in air and moisture and develops rust (hydrated iron (III) oxide).

The brain is made of three main parts: the forebrain, midbrain, and hindbrain. The forebrain consists of the cerebrum, thalamus, and hypothalamus . The midbrain consists of the tectum and tegmentum. The hindbrain is made of the cerebellum, pons and medulla.

Cerebrum:The cerebrum is the largest part of the human brain, associated with higher brain function such as thought and action. The cerebral cortex is divided into four sections, called "lobes": the frontal lobe, parietal lobe, occipital lobe, and temporal lobe.

• Frontal Lobe- associated with reasoning, planning, parts of speech, movement, emotions, and problem solving
• Parietal Lobe- associated with movement, orientation, recognition, perception of stimuli
• Occipital Lobe- associated with visual processing
• Temporal Lobe- associated with perception and recognition of auditory stimuli, memory, and speech

Thalamus-It is a large mass of gray matter deeply situated in the forebrain at the topmost portion of the diencephalon. The structure has sensory and motor functions. Almost all sensory information enters this structure where neurons send that information to the overlying cortex.

Hypothalamus-It is a part of the diencephalon, ventral to the thalamus. The structure is involved in functions including homeostasis, emotion, thirst, hunger, circadian rhythms, and control of the autonomic nervous system. It also controls the pituitary.

Midbrain-It is involved in functions such as vision, hearing, eyemovement, and body movement.

Cerebellum - The cerebellum has two hemispheres and has a highly folded surface or cortex. This structure is associated with regulation and coordination of movement, posture, and balance.

Pons- It is involved in motor control and sensory analysis. It has parts that are important for the level of consciousness and for sleep.

Medulla Oblongata-This structure is present between the pons and spinal cord. It is responsible for maintaining vital body functions, such as breathing and heartrate.

ANSWER

As both X and Y had 12 protons both has atomic number 12 that is magnesium. In case of Y, we have only 10 electrons because of this the affect of nuclear charge on the electrons is more than that of on 12 electrons(happens for same number of protons). Hence, radii of Y is smaller than that of X

 Vegetative Propagation

It is the mode of asexual reproduction in plants. Plant parts are detached from the parent & form a new plant. Structures which help in vegetative propagation are called Vegetative propagules. Example: Rhizome, tuber etc.

Natural vegetative propagation

• Root
• Stem
• Leaves

Vegetative propagation is the production of new plants from the vegetative parts of the plant. Roots, stems and leaves are called the vegetative parts of a plant.

Vegetative propagation takes place by both natural methods and artificial methods.

Artificial methods of vegetative propagation include grafting, layering, cutting. 

a) Grafting involves fusion of tissues of one plant with those of another plant. Grafting is a vegetative method of propagation for apples and roses.The grafted plant consist of a scion and rootstock. Scion is the upper part of grafted plant that forms the shoot where the rootstock is the lower portion of the grafted plant which forms the roots.Scions are selected for good characteristics such as flowers, fruits where rootstocks are selected as the plant benefit through the efficient intake of nutrients from soil as well for disease, pest and drought resistence.In root stock grafting scion of desired plant is inserted to a rootstock by making an inward cut in the rootstock and sealing the graft area.

Layering: This involves bending of a young stem towards the ground and burying it under the soil for development of roots . After a period of time, as the roots develop, the bent stem is cut off from the parent plant. This acts as a new plant. e.g. Jasmine.   

Cutting: It involves planting a young cutting of the stem with buds into moist soil. This develops roots which absorb nutrition from the soil and help in the growth of new plant. e.g. Bougainvellia. Cutting: It involves planting a young cutting of the stem with buds into moist soil. This develops roots which absorb nutrition from the soil and help in the growth of new plant. e.g. Bougainvellia.

In order to conduct electricity a substance must have charge particles, such as electrons and ions, that are free to move freely through it. In the solid state, ionic compounds such as sodium chloride have their ions fixed in position and therefore these ions cannot move so solid ionic compounds cannot conduct electricity. However in the molten state, ions in ionic compounds are free to flow and therefore molten sodium chloride can conduct electricity.

Artificial methods of vegetative propagation include grafting, layering, cutting. 

a) Grafting involves fusion of tissues of one plant with those of another plant. Grafting is a vegetative method of propagation for apples and roses.The grafted plant consist of a scion and rootstock. Scion is the upper part of grafted plant that forms the shoot where the rootstock is the lower portion of the grafted plant which forms the roots.Scions are selected for good characteristics such as flowers, fruits where rootstocks are selected as the plant benefit through the efficient intake of nutrients from soil as well for disease, pest and drought resistence.In root stock grafting scion of desired plant is inserted to a rootstock by making an inward cut in the rootstock and sealing the graft area.

Layering: This involves bending of a young stem towards the ground and burying it under the soil for development of roots . After a period of time, as the roots develop, the bent stem is cut off from the parent plant. This acts as a new plant. e.g. Jasmine.   

Cutting: It involves planting a young cutting of the stem with buds into moist soil. This develops roots which absorb nutrition from the soil and help in the growth of new plant. e.g. Bougainvellia. Cutting: It involves planting a young cutting of the stem with buds into moist soil. This develops roots which absorb nutrition from the soil and help in the growth of new plant. e.g. Bougainvellia.

Curd and sour substances contain acids. Acids react with metals to produce salt and hydrogen gas. So, if such substances are kept in copper container, the acid will react and the container will be corroded.

Global warming refers to the increasing temperature of the Earth’s climate system and its related effects. Scientific evidence has conclusively proven that the Earth’s temperature is in fact rising and has risen by 0.85^oC. This has an impact has affected different regions differently. The effects include rising sea levels, retreating glaciers, loss of sea ice in the poles, warming global temperatures, changing precipitation, expansion of deserts, etc.

This raises significant threats for humans such as food security from decreasing crop yields, submergence of a low-lying area due to the rising sea. To prevent irreversible damage to the delicate ecosystems on Earth, scientists have decided that global warming should be limited to a maximum of 2.0^oC relative to pre-industrial levels. The greenhouse effect plays an important role in the rising temperature. And hence to restrict global warming we need to limit the greenhouse effect and the gaseous emissions that cause the greenhouse effect.

Fourteen of the fifteen years in the 21^st century have been the hottest years on record with constant occurrences of extreme weather, cyclones, droughts, floods, etc. All these events are some way or the other have an association with the greenhouse effect and global warming.