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    • Posted by Account Deleted 6 years, 2 months ago

    CBSE > Class 07 > Science
    • 1 answers

    .. ... 6 years, 1 month ago

    When the oxides react with water they form compounds containing hydrogen as well as oxygen and the other element. In general, if that other element is a metal the compound is basic. On the other hand, if that other element is a nonmetal, the compound is generally acidic.

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    • Posted by Safiya Mariam 6 years, 2 months ago

    CBSE > Class 07 > Science
    • 1 answers

    Yogita Ingle 6 years, 2 months ago

    A simple pendulum consists of a small metal ball (called bob) suspended by a long thread from a rigid support, such that the bob is free to swing back and forth.
    The time period of a simple pendulum is the time taken by the pendulum bob to make one complete oscillation.

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    • Posted by Katikela Devina 6 years, 2 months ago

    CBSE > Class 07 > Science
    • 1 answers

    Meghna Thapar 5 years, 10 months ago

    It is a common observation that if exhale air on a mirror through our mouth than a patch of moisture is formed on the surface of the mirror. This is because the exhale air coming from the mouth contains lot of water vapour.

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    • Posted by Sourav Kumar 6 years, 2 months ago

    CBSE > Class 07 > Science
    • 1 answers

    Yogita Ingle 6 years, 2 months ago

    Excretion in plants occurs through various means -

    1.  Excess water is removed through stomata by transpiration which is the process of removal or evaporation of water.

    2.  Plants also get rid of oxygen, a by - product in the process of photosynthesis and carbon dioxide which is the by - product formed during respiration. The plants get rid of these by stomata present in their leaves.

    3. Some of the wastes stored in the leaves are removed by the detachment of the leaves itself from  the tree.

    4. Waste are also stored in the cellular vacuoles which do not affect the functioning of cytoplasm because of its outer membrane known as tonoplast.

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    • Posted by Harsh Sahitya 6 years, 2 months ago

    CBSE > Class 07 > Science
    • 2 answers

    Account Deleted 6 years, 2 months ago

    Non refictive means that there will not be any refliction when you stand at a reflective object

    1Thank You

    Account Deleted 6 years, 2 months ago

    Reflective means the reflection that comes when you stand at a reflective object

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    • Posted by Sarat Chandra Sethi 6 years, 2 months ago

    CBSE > Class 07 > Science
    • 2 answers

    Jon Michel 6 years, 2 months ago

    Its a pendulum in which the ocsilation of pendulum point move in per sec time is called ocsilatory motion ok bro

    1Thank You

    Yogita Ingle 6 years, 2 months ago

    A simple pendulum consists of a small metal ball (called bob) suspended by a long thread from a rigid support, such that the bob is free to swing back and forth.
    The time period of a simple pendulum is the time taken by the pendulum bob to make one complete oscillation.

    1Thank You

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    • Posted by Sarat Chandra Sethi 6 years, 2 months ago

    CBSE > Class 07 > Science
    • 0 answers
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    • Posted by Chaitsingh Bisen 6 years, 2 months ago

    CBSE > Class 07 > Science
    • 3 answers

    Harsh Sahitya 6 years, 2 months ago

    Presence of oxygen from air and water as water vapour from moist air is essential for rusti

    1Thank You

    Jon Michel 6 years, 2 months ago

    The presence of water and oxygen is essential for the rusting of iron. Impurities in the iron, the presence of water vapor, acids, salts and carbon dioxide hastens rusting. Pure iron does not rust in dry and carbon dioxide free air.

    1Thank You

    Gaurav Seth 6 years, 2 months ago

    Rusting of iron (Fe) is caused by oxidation of Fe to form Fe2O3.

    The two essential conditions are: 

    a) Presence of Oxygen

    b) Presence of Water whose pH is in acidic range.

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    • Posted by Nupur Bhosale 6 years, 2 months ago

    CBSE > Class 07 > Science
    • 3 answers

    Abhi Gupta 6 years, 1 month ago

    They excreat dry stool. They excreat less urine.

    1Thank You

    Abhi Gupta 6 years, 1 month ago

    They sweats less.

    1Thank You

    Jon Michel 6 years, 2 months ago

    Nocturnal desert animals keep cool by being active at night, whereas some other desert animals get away from the sun's heat by digging underground burrows. Other common adaptations seen in desert animals include big ears, light-colored coats, humps to store fat, and adaptations that help conserve water.

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    • Posted by Ram Suresh Tiwari 6 years, 2 months ago

    CBSE > Class 07 > Science
    • 1 answers

    Jon Michel 6 years, 2 months ago

    SO₄²-

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    • Posted by Rakesh Patel 12850 6 years, 2 months ago

    CBSE > Class 07 > Science
    • 1 answers

    Yogita Ingle 6 years, 2 months ago

    Rearing of silk worm :- Silkmoth is a large, white insect. It lays hundreds of eggs which are stored at a suitable temperature. Eggs hatch to produce larvae which are called caterpillar or silkworm. Caterpillar eats and grow and secrets a liquid. Liquids hardens on coming in contact with air and changes into a fine protein thread. Caterpillars cover itself with these fibres and form cocoon.

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    • Posted by Jasmin Gohel 6 years, 2 months ago

    CBSE > Class 07 > Science
    • 2 answers

    Jon Michel 6 years, 2 months ago

    Heart rate is the number of heartbeats per unit of time. Usually heart rate is expressed as beats per minute (BPM). The heart beats to supply oxygenated clean blood from the left ventricle to the blood vessels of the body via the aorta.

    1Thank You

    Manish Giri Goswami 6 years, 2 months ago

    It helps to pump blood with the continuous heartbeat

    1Thank You

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    • Posted by Julfiquer Ahmed 6 years, 2 months ago

    CBSE > Class 07 > Science
    • 1 answers

    Abhi Gupta 6 years, 1 month ago

    Sfgg

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    • Posted by Harpreet Kaur 6 years, 2 months ago

    CBSE > Class 07 > Science
    • 0 answers
    ANSWER

    • Posted by Krishanvir Singh 6 years, 2 months ago

    CBSE > Class 07 > Science
    • 2 answers

    Jon Michel 6 years, 2 months ago

    Cellular respiration is a set of metabolic reactions and processes that take place in the cells of organisms to convert biochemical energy from nutrients into adenosine triphosphate (ATP), and then release waste products. Respiration is one of the key ways a cell releases chemical energy to fuel cellular activity.

    1Thank You

    Yogita Ingle 6 years, 2 months ago

    Respiration happens inside the cells. As respiration happens inside the cell, it is also called cellular respiration. A cell organelle; called mitochondria; is the site of cellular respiration.

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    • Posted by Ruhi Bansal 6 years, 2 months ago

    CBSE > Class 07 > Science
    • 0 answers
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    • Posted by Permita Debnath 6 years, 2 months ago

    CBSE > Class 07 > Science
    • 1 answers

    Yogita Ingle 6 years, 1 month ago

    Rust is another name for iron oxide, which occurs when iron or an alloy that contains iron, like steel, is exposed to oxygen and moisture for a long period of time. Over time, the oxygen combines with the metal at an atomic level, forming a new compound called an oxide and weakening the bonds of the metal itself

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    • Posted by Roshini Praveen 6 years, 2 months ago

    CBSE > Class 07 > Science
    • 1 answers

    Permita Debnath 6 years, 2 months ago

    There some spaces between soil particles from thre it breaths

    2Thank You

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    • Posted by Jyotishman Dutta 6 years, 2 months ago

    CBSE > Class 07 > Science
    • 1 answers

    Rudrrsha Rudrrsha.V 6 years, 2 months ago

    F

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    • Posted by Daisy Joy 6 years, 2 months ago

    CBSE > Class 07 > Science
    • 3 answers

    Naman Ahden 6 years, 2 months ago

    Because of absence of water H2O

    0Thank You

    Jon Michel 6 years, 2 months ago

    Though some fish can breathe on land taking oxygen from air, most of the fish, when taken out of water, suffocate and die. This is because gill arches of fish collapse, when taken out of water, leaving the blood vessels no longer exposed to oxygen in air

    1Thank You

    Yogita Ingle 6 years, 2 months ago

    Fishes respire with the help of their gills. Gills are richly supplied with blood capillaries and can readily absorb the oxygen dissolved in water. The water contains some dissolved oxygen in it. When the water enters the fish through its mouth, the dissolved oxygen is taken inside and carbon dioxide is given out through the gills. In this way, the fishes breathe in water. When fishes are taken out of water, the supply of oxygen to the fishes is cut as the fishes cannot absorb and breathe using the oxygen present in the atmosphere. Hence, they die after some time.

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    • Posted by Prerit Toppo 6 years, 2 months ago

    CBSE > Class 07 > Science
    • 1 answers

    Yogita Ingle 6 years, 1 month ago

    We can check that soil is acid basic or salt by mixing little amount of water with soil in a beaker. After that we have to put an universal indicator in the beaker. And we can check it's nature by just matching obtained colour with universal chart. They usually treat with calcium chalk or slaked lime when the soil becomes too acidic to neutrilize it.

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    • Posted by Santosh Thakur 6 years, 2 months ago

    CBSE > Class 07 > Science
    • 1 answers

    Jon Michel 6 years, 2 months ago

    The biggest difference is particle size. Of all types of soil, sand has the largest particle size, and clay has the smallest. One grain of sand in hundreds of times the size of a clay particle. Because of this difference, sand drains water fast, and clay retains water very well (too well usually).

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    • Posted by Pritesh Amburle 6 years, 2 months ago

    CBSE > Class 07 > Science
    • 2 answers

    Rajendra Kumar 6 years, 2 months ago

    Water

    1Thank You

    Deeya Singh 6 years, 2 months ago

    Nothing should be done as it already contains Rizobium

    1Thank You

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    • Posted by Arvind Kumae 6 years, 2 months ago

    CBSE > Class 07 > Science
    • 2 answers

    Jon Michel 6 years, 2 months ago

    The eye is a region of mostly calm weather at the center of strong tropical cyclones. The eye of a storm is a roughly circular area, typically 30–65 kilometres (19–40 mi) in diameter. It is surrounded by the eyewall, a ring of towering thunderstorms where the most severe weather and highest winds occur.

    1Thank You

    Avika Mathur 6 years, 2 months ago

    In center of strom

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    • Posted by Manoj Thawrani Manoj Rain 6 years, 2 months ago

    CBSE > Class 07 > Science
    • 1 answers

    Jon Michel 6 years, 2 months ago

    Transport of materials is necessary in both plants and animals as every cell needs a regular supply of nutrients and oxygen for releasing energy through respiration. The food that we eat is broken down into smaller components to be absorbed by the cells.

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    • Posted by Soham Adap 6 years, 2 months ago

    CBSE > Class 07 > Science
    • 1 answers

    Jon Michel 6 years, 2 months ago

    Animals in the polar region are adapted to the extremely cold climate by having some special characteristics such as white fur, strong sense of smell, a layer of fat under the skin, wide and large paws for swimming and walking, etc.

    1Thank You

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    • Posted by Kamaljit Kaur 6 years, 2 months ago

    CBSE > Class 07 > Science
    • 2 answers

    Jon Michel 6 years, 2 months ago

    "This single-celled amoeba crawls around by using actin polymerization to push out pseudopods, or false feet, to explore new territory. At the same time, organelles move in complex patterns within the cell.

    1Thank You

    Arvind Kumae 6 years, 2 months ago

    Amoeba constantly changes its shape and position.It pushes out one

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    • Posted by Aleemuddin Shaikh 6 years, 2 months ago

    CBSE > Class 07 > Science
    • 3 answers

    Jon Michel 6 years, 2 months ago

    Spiracles

    1Thank You

    Avika Mathur 6 years, 2 months ago

    Spiracles

    0Thank You

    Soham Adap 6 years, 2 months ago

    yes

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    • Posted by Pooja Kisor 6 years, 2 months ago

    CBSE > Class 07 > Science
    • 2 answers

    Abhi Gupta 6 years, 1 month ago

    Because in air of costal area contain humidity and in desert not .

    0Thank You

    Jon Michel 6 years, 2 months ago

    Rusting of iron occurs only if iron comes in contact with moist air. In coastal areas, air contains high percentage of moisture because of sea or ocean, while in deserts air is dry and hot. As the percentage of moisture in air is more in coastal area compared to desert, rusting becomes faster.

    1Thank You

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    • Posted by Praful Yadav 6 years, 2 months ago

    CBSE > Class 07 > Science
    • 3 answers

    Naman Ahden 6 years, 2 months ago

    Ruminants are organisms which bring back their chewed food into the mouth and chew it for sometimes again and again. Eg.- cow

    0Thank You

    Jon Michel 6 years, 2 months ago

    Ruminants are mammals that are able to acquire nutrients from plant-based food by fermenting it in a specialized stomach prior to digestion, principally through microbial actions.

    1Thank You

    Srinidhi Panchal 6 years, 2 months ago

    The grass eating plants are called ruminants

    0Thank You

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