General Science Mixed Quiz: Set 107

Acceleration is the change in velocity divided by the time taken, and 10 minutes is one-sixth of an hour.

Meiosis makes gametes that differ from one another, and fertilization joins a gamete from each of two parents, so every offspring gets a new mix of genes.

The oyster feeds by drawing water over its gills and straining out plankton and organic particles, which is filter feeding.

The de Broglie wavelength depends only on momentum, so equal wavelengths mean equal momenta. In 1924 Louis de Broglie proposed that every moving particle has a wave linked to it, with wavelength λ = h/p, where h is Planck's constant and p is the linear momentum.

It is produced when a plant faces drought, salinity or extreme temperature; it closes the stomata so that water is not lost, for which reason it is called an antitranspirant, and it induces dormancy in seeds and buds so that growth waits for better conditions.

The receptors that pick up taste are called gustatory receptors, and they sit inside the taste buds on the tongue.

A star is so far away that it is a point source of light.

The anther is the top part of the stamen, the male organ of a flower, and pollen grains form inside it.

This is double fertilisation, a feature found only in flowering plants. The pollen tube carries the two male gametes into the embryo sac.

On a level curve, friction alone supplies the centripetal force, so a cyclist slips when the needed force exceeds the maximum friction.

Filament bulbs are commonly filled with argon, often mixed with nitrogen, not helium. An inert gas in a filament bulb slows the evaporation of the hot tungsten filament.

High pressure pushes the gas molecules close together and low temperature slows them down, so the attractive forces can hold them as a liquid.

Temporary hardness comes from dissolved calcium and magnesium hydrogencarbonates (bicarbonates), and it can be removed simply by boiling. On boiling, calcium hydrogencarbonate breaks down into insoluble calcium carbonate, water and carbon dioxide, and the carbonate settles out; this is the scale seen inside kettles.

Crown gall is caused by the bacterium Agrobacterium tumefaciens, which enters through a wound near the base, or crown, of the stem and makes the plant grow rough tumour-like swellings there.

The emf of a battery equals the power it supplies divided by the current it drives, because power P = EI.

Moving a substance from low to high concentration is uphill work, and the cell pays for it with ATP.

Pollen first reaches the stigma, then the gametes fuse, the zygote divides to form an embryo, and the embryo inside the seed grows into a seedling.

For an ideal gas in a fixed volume at a fixed temperature, pressure is proportional to the number of molecules, so half the molecules give half the pressure.

The 2011 FSSAI labelling rules made the list of ingredients, nutrition information and the vegetarian or non-vegetarian mark compulsory, but not medical advice on allergies.

Wet straw or gunny bags keep the fresh concrete moist, so water does not evaporate before the cement has hydrated properly.