A nephron is the basic structural and functional unit of the kidney. Its chief function is to regulate the concentration of water and soluble substances like sodium salts by filtering the blood, reabsorbing what is needed and excreting the rest as urine.
Q2. Which Vitamin is obtained from Sun rays?
सूर्य के किरणों से कौन सा विटामिन प्राप्त होता है?
Human skin can make large amounts of vitamin D when lots of skin is exposed and the sun is high in the sky. Your body is designed to get the vitamin D it needs by producing it when your bare skin is exposed to sunlight. The part of the sun’s rays that is important is ultraviolet B (UVB).
Chlorophyll absorbs the sun’s energy. It is this energy that is used to split water molecules into hydrogen and oxygen. Oxygen is released from the leaves into the atmosphere. Hydrogen and carbon dioxide are used to form glucose or food for plants.
Insulin is a peptide hormone produced by beta cells of the pancreatic islets, and it is considered to be the main anabolic hormone of the body. It regulates the metabolism of carbohydrates, fats and protein by promoting the absorption of, especially, glucose from the blood into fat, liver and skeletal muscle cells.
Q8. Which among the following carries impure blood to human heart?
निम्नलिखित में से कौन मानव हृदय तक अशुद्ध रक्त पहुँचाता है?
Pulmonary trunk or artery is the only artery in the body which carries impure or deoxygenated blood. It carries deoxygenated blood collected from all parts of the body to the lungs for purification or oxygenation.
Q9. Why does water tank appear shallower when viewed from the top?
ऊपर से देखने पर पानी का टैंक उथला क्यों दिखाई देता है?
(a) Due to reflection/ प्रतिबिंब के कारण
(b) Due to refraction/ अपवर्तन के कारण
(c) Due to diffraction/ विवर्तन के कारण
(d) Due to total internal reflection/ कुल आतंरिक प्रतिबिंब के कारण
The Largest Animal Ever: The Blue Whale. The blue whale(Balaenoptera musculus) is a marine mammal belonging to the suborder of baleen whales. At 30 metres (98 ft) in length and 180 metric tons (200 short tons) or more in weight, it is the largest known animal to have ever existed.
RNA stands for RiboNucleic Acid. It is an important molecule with long chains of nucleotides. A nucleotide contains a nitrogenous base, a ribose sugar, and a phosphate. Just like DNA, RNA is vital for living beings
Q12. At which of the following place, weight of an object is maximum?
निम्नलिखित में से किस स्थान पर एक वस्तु का भार सर्वाधिक होता है?
The gravitational force like other forces obeys inverse square law i .e. the more is the distance between two objects, the lesser the force.
The earth is not a perfect sphere. It is flatter at the poles and hence, if an object is at poles than it is more closer to the center of the earth than compared to other places and hence it suffers more gravity.