Why there are no blood capillaries in the cornea of the eye and cartilage? How are these regions supplied with the required nutrients?

Why is the velocity of blood flow the lowest in the capillaries

Why is the velocity of blood flow the lowest in the capillaries?

a. The far point of a myopic person is 80cm in front of the eye. What is the power of the lens required to enable him to see very distant object clearly ? b. In what way does the corrective lens help the above person ? Does the lens magnify very distant objects? Explain carefully. c. The above person profers to remove his spectacles while reading a book Explain why.

The eye of the nocturnal birds like owl are having a large cornea and a large pupil. How does it help them ?

a. The near point of a hypermetropic person is 75 cm from the eye. What is the power of the lens required to enable the person to read clearly a book held at 25 cm from the eye? b . In what way does the corrective lens help the above person? Does the lens magnify objects held near the eye ? c. The above person prefers to remove the spectacles with looking at the sky. Explain why .

Sita is a owner of confectionary. She got an order from one of her customers to prepare 150 loaves of bread for a birthday party. On her making process of bread, though there is a time constrain, she prepared the dough and kept it aside undisturbed for few hours. Later she made the required number of breads and delivered to customer on time. A day after the party, customer appreciated Sita for the soft and good quality of bread that she supplied to party. (a) Why Sita kept aside the dough undisturbed? (b) Name the living organism involved in the process. (c) What are the products of the process? (d) How this process enhances the quality of food?

Answer the following questions . a. The earth's magnetic field varies from point is space. Does it also change with time ? It so , on what time scate does it change appreciably ? b. The earth's core is known to contain iron. Yet geologists do not regard this as a source of the earth's magnetism why ? c. The charged currents in the outer conducting regions of the earth's core are thought to be responsible for earth's magnetism . What might be the ' battery ' (i.e., the source of energy) to sustain these currents ? d. The earth may have even reversed the direction of its field several times during its history of 4 to 5 billion years. How can geologists know about the earth's field in such distant past ? e. The earth's field departs from its dipole substantially at large distances (greater than about 30,000 km) what agencies may be responsible for this distortion ? f. Interstellar space has an extremely weak magnetic field of the order of 10^(-12) T, Can such a weak field be of any significant consequence ? Explain. [Note : Exercise 2 is meant mainly to arouse your curiosity . Answers to some question above are tentative or unknown . Brief answers wherever possible are given at the end . For details , you should consult a good text on geomagnetism.]