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Yogita Ingle 5 years, 8 months ago
The velocity of an object under motion at a specific point of time.
The instantaneous velocity formula is given by
Vi =limΔt→0 ds/dt
Where,
- Δt is the small time interval.
- Vi is the instantaneous velocity.
- s is the displacement.
- t is the time.
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Yogita Ingle 5 years, 8 months ago
Integrated Child Development Services (ICDS) scheme is world's largest community based programme. The scheme is targeted at children upto the age of 6 years, pregnant and lactating mothers and women 16–44 years of age. The scheme is aimed to improve the health, nutrition and education (KAP) of the target community. Launched on 2 October 1975, the scheme has completed 25 years of its operational age.
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Yogita Ingle 5 years, 8 months ago
- Fungi are heterotrophic organisms.
- Fungi are filamentous, with the exception of unicellular yeasts.
- Fungi consist of long, slender thread-like structures called
- The network of hyphae is known as mycelium.
- Some hyphae are continuous tubes filled with multinucleated cytoplasm, these are called coenocytic hyphae and others have septae or cross walls in their hyphae.
- The cell walls of fungi are composed of chitin and polysaccharides.
- Most fungi are heterotrophic and absorb soluble organic matter from dead substrates and hence are called
- The fungi that depend on living plants and animals are called
- Fungi can also live as symbionts
- . Example- in association with algae as lichens and with roots of higher plants as
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Mr. Singh 5 years, 8 months ago
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The property of a body by virtue of which the body tries to regain its original shape after the removal of deforming force, is called as Elasticity.
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Posted by Advika Thakur 5 years, 9 months ago
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Meghna Thapar 5 years, 1 month ago
In the taxonomic hierarchy, lower the rank higher is the degree of similarity between the occupants. Order is the assemblage of families, which exhibit a few similar characters.
Cat belongs to same family Felidae, while rabbit belongs to Leporidae.
The binomial nomenclature was introduced by Carolus Linnaeus in which the genus name and the species epithet are used for scientific naming of an organism.
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Yogita Ingle 5 years, 9 months ago
Bh3 molecule is an electron deficient molecule in nature since the 6 electrons are around the 'B' atom. Hydrogen being small in size, plus electron deficient it cannot donate electrons to boron, hence to exist, Bh3 goes under dimerization so as to fulfill the electron deficiency and attain stability.
Hydrogen being small in size dimerization is possible.
Bf3 is also deficient but because of larger size of 'F' atom, it cannot undergo dimerization, so it exists as Bf3 with a partial negative charge in boron and partial positive charge on fluorine.
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Yogita Ingle 5 years, 9 months ago
Since x-coordinate of every point in yz-plane is zero. Let P (0, y, z) be a point on the yz-plane such that PA = PB = PC.
Now PA = PB
(0 – 2)2 + (y – 0)2 + (z – 3)2 = (0 – 0)2 + (y – 3)2 + (z – 2)2
i.e. z – 3y = 0
and PB = PC
⇒ y2 + 9 – 6y + z2 + 4 – 4z = y2 + z2 + 1 – 2z ,
i.e. 3y + z = 6 Simplifying the two equating, we get y = 1, z = 3
Here, the coordinate of the point P are (0, 1, 3).
Posted by Suman Sharma 5 years, 9 months ago
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Yogita Ingle 5 years, 9 months ago
let the point p be (h, k)
Now 2PA,=3PB
PA=√[h^2+k^2]
pb=√[h-4]^2+[k+3]^2
given 2PA=3PB
SQ. both sides
4PAsq. =9PBsq
4(h^2+k^2)=9[(h-4)^2+(k+3)^2]
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Yogita Ingle 5 years, 9 months ago
The study of plant anatomy helps us to understand the structural adaptations of plants with respect to diverse environmental conditions. It also helps us to distinguish between monocots, dicots, and gymnosperms. Such a study is linked to plant physiology. Hence, it helps in the improvement of food crops. The study of plant-structure allows us to predict the strength of wood. This is useful in utilising it to its potential. The study of various plant fibres such as jute, flax, etc., helps in their commercial exploitation.
Posted by Saloni Thakur 5 years, 9 months ago
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Yogita Ingle 5 years, 9 months ago
The neurons are said to be in resting state when they are not conducting any impulse. In that case, the membrane of the axon is more permeable to potassium ions and impermeable to sodium ions and the negatively charged proteins present in axoplasm. The plasma in the axon contains a high concentration of potassium ions and proteins and low concentration of sodium ions. Whereas the fluid outside the axon contains a high concentration of sodium ions and low concentration of potassium ions. Due to this, a concentration gradient is formed. Active transport of ions occurs across the membrane by the sodium-potassium pump where three ions of sodium are transported outwards and two ions of potassium move into the cell. Because of this, the outer surface of the membrane becomes positively charged while the inner surface is negatively charged. The cell is said to be in a polarised state. The electrical potential difference across the resting plasma membrane is known as resting potential.
When we apply a stimulus at a site on the polarised membrane, the membrane at the site becomes freely permeable to sodium ions. Due to this, sodium ions move into the cell and the outer side of the membrane becomes negatively charged and the inner side becomes positively charged. The membrane is said to be in the depolarised state. The electrical potential difference generated across the plasma membrane at this site is known as action potential or nerve impulse. This area becomes a stimulus for the neighboring area of the membrane which becomes depolarised. The former membrane becomes repolarised due to the movement of sodium ions outside the cell. This is how impulses are conducted.
Posted by Saloni Thakur 5 years, 9 months ago
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Saloni Thakur 5 years, 9 months ago
Yogita Ingle 5 years, 9 months ago
Skeletal muscle is composed of muscle fibers which have smaller units called myofibrils. There are three types of proteins make up each myofibril; they are contractile, regulatory and structural proteins.
By contractile proteins, we mean actin (thin filament) and myosin (thick filament). Each actin filament is composed of two helical “F” actin (filamentous actin) and each ‘F’ actin is made up of multiple units of ‘G’ actin. Along with the ‘F’ actin, two filaments of regulatory proteins tropomyosin and troponin at regular intervals are present. During muscle relaxation, troponin covers the binding sites for myosin on actin filaments.
Each myosin is composed of multiple units of meromyosin which has two important parts- a globular head known as heavy meromyosin with a short arm and a tail known as light meromyosin. The head and arms project at regular distance and angle from each other from the surface of myosin filament and are known as the cross arm. The head bears binding sites for ATP and active sites for actin. Let us now try to understand the muscle contraction mechanism.
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Shivam Kumar 5 years, 8 months ago
2Thank You