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Q . Why should only dried seeds of plants be used for sowing? Ans . Seeds are formed from the ovaries of flowers. The embryo embedded in the seed coat is not mature when the seed is fresh and raw. It takes time to mature fully. Therefore only sufficiently dried seeds which germinate easily can be useful for sowing. Q .How do the parrots speak like us? Ans . Birds produce sounds in adiifrent way from human beings. Man has a voice box or larynx. It consists vocal chords which upon vibration produce sound. This sound is modulated by using teeth, tongue, lips etc and also by changing the shape of the mouth. Birds on the other hand have a voice box called Syrinx. It is present at the base of the trachea. The syrinx consits of an expanded chamber called tympanum. There are Membranes in it. These vibrate as the air from the lungs is expelled. The pitch of is altered by changes in the tension of these membranes which are controlled by muscles. The syrinx is a structure in birds which is not seen in most vertebrates. Parrots have the capacity to imitate the sound which they constantly hear. Although we try to associate their sound with our sppech, These birds do not actually speak like us. They just imitate the sound using their syrinx and their speech is not well modulated. Q .Some plants shed thier all the leaves.How can they prepare food without leaves? Ans . Leaves are mini factories for producing food using chlorophyll as the machinery. When the weather becomes cold the food that has been produced and stored in leaves, in the form of starch, is transported to the branches and trunk. The chlorophyll of the factory or the leaves, becomes yellow or brown. Before the leaves fall, the stalk is sealed by a compact layer. The stored food is used by the plant for growth in winter. Q . How do some insects walk on water? Ans . It is fascinating to see insects merrily skating over a pond without sinking in water. The water surface acts like a very thin membrane which is stretched tight. It can support light objects which are not wet and which cannot pierce this skin. Also, the legs of the insects being covered by an oily substance further enables them to walk across the water. Q . How does woodpecker feed himself on the insect's living inside the tree ? Ans . Drilling the bark of the tree with a chisel like bill, the woodpecker exposes the tunnels of wood-boring insect larve. It flicks in its tongue (up to 6 inches long in green woodpecker) and stabs the grubs with the barbed tip to withdraw them.  Q . Why do flamingos have bent beaks ? Ans . The beak of flamingo looks as if it has broken in half and the halves bent downwards and rejoined. As you might expect there is a very good reason for this peculiar shape. Flamingo like to live in shallow lagoons and lakes. Despite thier large size and thier large beaks flamingoes feed on the smallest of organisms in water .In this position the upper half is underneath and the beak is now an ideal scooping organ. The flamingo sweeps its head from side to side through the water to collect tiny molluscs, crustaceans and single-celled algae. As the tongue pumps water through the beak, this food is caught on a sieve like structure inside and passed down the throat. 
Q . If we drink glucose we feel refreshed. Why is it so? Ans . The food we eat is broken down into very simple forms in our body. During this process of metabolism, the startches break down to glucose. This is burnt as a fuel to provide energy. Glucose water can be used to provide you energy very quickly. You will, however note taht even sucrose, is quite refreshing because our body can convert sucrose into glucose almost simultaneously. Q . How can our nail and hair grow although they are non-living? Ans . Nails and hair are really tissue, called Keratin, both originatein cells that are very much alive. Growth occurs in the living region near the root. New cells push the dead, hard nail stalks upward, then die themselves and are reaplaced from below. A nail's living, growing part is found beneath the whitish half moon, at its base. Similarly the bottom end or root of a hair is lodged in a follicle, ahollow resembling a rounded bottle with a long narrow neck, slanting towards the skin's surface. The follicle is alive. Try to pull out a few hair. Doesn't it hurt?  Q . Why is it that some animal's eyes twinkle in the night? Ans . In the animalsthat hunt in the dark and in deep-sea animals, the eyes are specially adapted to see in very dim light. They usually have large eyes with large large pupils. Behind the retina is a coating of a substance called tapetum. It looks like polished silver. The tapetum reflects every bit of light, that comes into the eye, back into the retina. This is what causes the eyes to twinkle or glow in the dark. Q . How fast can a bird fly ? Ans . Quite amazingly fast even the common sparrow can reach fifty miles an hour, and the duck can reach seventy. But the records goes, not surprisingly, to the aptly named swift. This amazing bird can reach speeds of over a hundred And six miles an hour.  Q . How do we speak ? Ans . Sounds are made by air passing through the Larynx, or voice box, in the throat. The sound comes out through the mouth. You can make different sounds by pushing your mouth into different shapes. Do you Know? If you want to say something loudly you need to pass more air through the mouth. This means you have to take a deep breath before shouting or singing. If you want to whisper you do not need much air in the throat nor do you need to move the mouth much. 
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