In Triangle ABC ,Angle B=90 and BD perpendicular AC, if AC=9 cm and AD=3 cm then BD is equal to
1. 2√2 cm
2.3√2 cm
3. 2√3 cm
4. 3√3cm
Find a quadratic polynomial whose
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If the LCM of 12 and 42 is 10m +4, then the value of m is
what is the theme and moral lesson of the story "The portrait of a lady"?
The type of salt formed by partial replacement of replaceable hydrogen ion of an acid by a basic radical is ____.
two charged metal spheres of radii R and 2R temporarily placed in contact and then separated. At the surface of each, which sphere has the greater value of the following: (a) charge, (b) charge density, (c) potential, (d) electric field.
phosphorus pentoxide , P4O10 has each phosphorus linked to
In Triangle ABC ,Angle B=90 and BD perpendicular AC, if AC=9 cm and AD=3 cm then BD is equal to
1. 2√2 cm
2.3√2 cm
3. 2√3 cm
4. 3√3cm
Reason: Nitrogen dioxide is produced as a by product due to the decomposition of lead nitrate.
20. A metallic sphere of radius 5 cm has a charge of 6 C. The surface charge density is
All living things require food for growth and development. It also gives them energy for sustaining life processes. For example, plants manufacture their own food by the process of photosynthesis. Such organisms are called autotrophs. Animals, on the other hand, depend on plants and other animals for their food. They are called heterotrophs.
All living things grow. Growth can be easily observed in all plants and animals. Living things either produce new cells or their pre-existing cells increase in size and hence they grow. In animals, growth stops as they reach their adult stage while the plants keep on growing throughout their life.
All living things respire. Respiration is a process that includes breathing. The movement of air in and out of the body and vice-versa is known as breathing.
For example, animals such as earthworms breathe through their skin; fish use gills for breathing; and plants exchange gases through tiny pores called stomata, which are present mainly on the surface of leaves. Respiration is a two stage process. It has two stages:
External respiration − This is the process of breathing i.e., taking in oxygen and giving out carbon dioxide.
Internal respiration − In this stage, oxygen taken in is utilised to produce energy.
All living organisms respond to stimuli.
Do you know what stimulus is?
Stimuli are certain changes in the surroundings that cause an organism to respond to them. For example, animals such as cockroaches hide as soon as the light is switched on.
Plants such as Mimosa pudica (touch-me-not) close their leaves when touched.
Let us now perform the following activity to understand how plants respond to stimuli.
Take a potted plant and keep it in a room at a slight distance from the window. Sunlight must enter through the window during the day time. Water this plant regularly for a few days.
You will observe that the stem of the plant bends towards the sunlight.
This proves that living organisms react to stimuli.
All living organisms excrete.
What is excretion?
A part of the food we eat is utilised by the body while the rest is removed from the body.
The process of getting rid of waste materials from the body is known as excretion. This process occurs in both plants and animals. In animals, waste products such as urea are excreted in urine; and carbon dioxide, which is also a waste product, is excreted by lungs. In plants, the wastes are converted into harmless substances such as gum, resins, etc.
All living organisms reproduce. Some animals produce eggs while others give birth to young ones. Plants, on the other hand, reproduce by producing spores or seeds.
Do you know?
Mammals such as humans, cats, dogs etc., which give birth to young ones, are called viviparous animals.
Animals such as hens, crocodiles, insects, etc., which produce eggs, are called oviparous animals.
All living organisms can move. It should be noted that all living organisms can move. While animals can move from one place to another with the help of special locomotory organs such as limbs, plants show movement in the form of movement of root towards earth, bending of flowers in sunflower plant towards light, etc. The energy for movement comes from within the organism.
All living organisms have a definite life span. All organisms have a definite life span. Organisms are born; they grow, and finally die. Some organisms have a short life span such as bacteria that live for only 20 to 25 minutes while some organisms have a longer life span such as tortoise that live up to 150 years.
We can now distinguish between living and non-living things.
Living things
Non-living things
They are made up of cells. They are not made up of cells.
They show movement, but the energy for movement comes from within the organism. They show movement by taking external force or energy.
They require food. They do not require food.
Growth in them is irreversible. Growth is reversible.
Respiration occurs in them for oxidising food to release energy. They do not require respiration.
Reproduction occurs in living things. Non-living things do not reproduce.
Differences between plants and animals
Plants
Animals
They can make their own food by the process of photosynthesis. They are autotrophs. They cannot make their own food. They are heterotrophs.
They show movement, but cannot show locomotion i.e., they cannot change their position from one place to another. They show movement as well as locomotion.
They show response to stimuli, but lack sense organs. They also show response to stimuli and have well-developed sense organs.
They grow throughout their life. They stop growing once they reach their adult form.
Find a quadratic polynomial whose
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(a) 7.5cm
(b) 3cm
(c) 4.5cm
(d) 6cm
If the LCM of 12 and 42 is 10m +4, then the value of m is
what is the theme and moral lesson of the story "The portrait of a lady"?
The type of salt formed by partial replacement of replaceable hydrogen ion of an acid by a basic radical is ____.
two charged metal spheres of radii R and 2R temporarily placed in contact and then separated. At the surface of each, which sphere has the greater value of the following: (a) charge, (b) charge density, (c) potential, (d) electric field.
phosphorus pentoxide , P4O10 has each phosphorus linked to
answers from the given options (1x5 = 5marks)
ON SPROUTS
(1) Sprouts relatively contain the largest amount of nutrients per unit of any food known to man.
Sprouts produce a fountain of power for chemical changes. Enzymes are produced, starch get
converted into glucose. Protein is transformed into amino acids and vitamin value increases. In
fact a new explosion of life force takes place. According to doctor Bailey of the University of
Minnesota, U.S.A. the vitamin C value of wheat increases 600 percent in the early sprouting
period. Doctor C.R Shaw of the University of Texas Cancer Center found that cancer was
inhibited upto 90% when healthy bacteria was exposed to a cancer causing substance in the
presence of a juice made from wheat sprouts.
(2) Enzymes which initiate and control almost every chemical reaction in our body are greatly
activated in the sprouting process. Enzymes spark the entire digestive system to synthesize the
nutrients in our food into blood. They are the key to longevity.
(3) Sprouts are enjoyed more when they are fresh. Mix sprouts with other food and dressings,
according to your taste and enjoy eating them. But eat them you must, everyday! You will soon
realize that making sprouts a part of your diet has a dramatic effect on your health. With this life
food, all the cells of your body become active and agile.
(4) The nourishment which develops as the sprouts grow is very stable and can be frozen or dried
for future. Sprouted potato or tomato seeds are likely to be poisonous. Alfalfa and moongbean
sprouts are excellent soft food. They are almost predigested and can be easily assimilated even
by the children and the elderly. They contain every non vitamin in perfect balance, necessary for
the human body.
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(a) Sprouts are useful because they ………………
(i) Contain largest amount of nutrients
(ii) Produce a fountain of power for chemical changes
(iii)Produce enzymes, convert starch into glucose
(iv) All of the above
(b) The vitamin C value of ……………. increases 600 percent in the early sprouting process.
(v) Nutrients (ii) wheat
(iii) Glucose (iv) Enzymes
(c) ………….. Seeds are likely to be poisonous when sprouted.
(vi) Alfalfa (ii) Moongbean
(iii) Potato and tomato (iv) None of the above
(d) ‘They’ are the key to longevity. Here ‘they’ refers to…………..
(i) Nutrients (ii) Vitamins
(iii) Sprouts (iv) Enzymes
(e) A word from the passage which means, to combine a large range of something is
……………
(i) Contain (ii) Inhibited
(iii) Synthesize (iv) Assimilate
a) both negative b) one positive one negative
c) both positive d) both equal
explain the ans with solution plzzzzzzzzzzz