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Science

Asked by Lisa

Four adaptations of the root hair that enable it to Carry out its function

- Root hair cells have long projections called root hairs which increase the surface area for efficient uptake of water and minerals. - Root hairs also have very thin cell walls decreasing the diffusion distance allowing for quicker osmosis. - They have lots of mitochondria for active transport of minerals into the plant. - They have lots of dissolved minerals and sugars in the cytoplasm giving th... more

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Zuzia Bieda
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773 students helped

Science

Asked by hannah

The velocity of a car increases from 8 m/s to 28 m/s in 10 seconds without changing direction calculate its acceleration

acceleration can be calculated using SUVAT S- displacment U- initial velocity V- final velocity A- aceleration T- time For this one we should use v = u + at rearrange to make a the subject: a = (V-U)/t Solve: a = (28-8)/10 a = 20/10 a = 2 ms-2 Any more questions? Let me know :)

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Soumya Sri Pichuka
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1.2k students helped

Science

Asked by Carys

An electric motor uses 50j of electrical energy and does 40j of work

Motors tend to not be 100% efficient so in this case, the 10j of energy could have been dissipated as heat energy. Check out energy Sankey diagrams and have a read through: https://www.bbc.co.uk/bitesize/guides/zgvc6fr/revision/3 Let me know if you have any more questions :)

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Soumya Sri Pichuka
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Computer Science

Asked by caesi

M=n+x/p

Science

Asked by Vanessa

What is the root cause in this case

Hello! Could you please write the full question/ problem please? We need more information 😉

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577 students helped

Science

Asked by Nokubonga

What causes the person with emphysema to find exercise difficult

Emphysema is a lung condition that causes shortness of breath. This happens when the inner walls of the alveoli in the lungs become weak rupture, making bigger airspaces instead of smaller ones. This means that when an individual takes a breath, they can’t fill their lungs as much since there is now a reduced surface area for the gas exchange to take place on. When we exercise, our hearts beat f... more

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Maryam Hussain
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113 students helped

Science

Asked by Jason

A bunch of seeds was put in a large underground hole. After a sometime, only the seeds on the outside germinated while the seeds at the centre of the hole did not terminate. Why is that so?

The germination of seeds requires optimum temperature, oxygen and water availability. It is likely that when seeds are put in a large underground there is low oxygen availability for the seeds at the centre of the hole compared to those seeds that are on outside. As a result due to the lack of ideal conditions the seeds at the centre remain dormant and are hence unable to germinate.

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Soumya Sri Pichuka
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Asked by Jahmiwh

Give three features of a alveoli That allows large amount of oxygen to enter the blood

Large surface area - many alveoli are present in the lungs with a shape that further increases surface area. Thin walls - alveolar walls are one cell thick providing gases with a short diffusion distance. Moist walls - gases dissolve in the moisture helping them to pass across the gas exchange surface. Permeable walls - allow gases to pass through. Extensive blood supply - ensuring oxygen rich blo... more

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