Why it is necessary to separate oxygenated and deoxygenated
[question] Question. Why it is necessary to separate oxygenated and deoxygenated blood in mammals and birds ? [/question] [solution] solution: Mammals and birds are warm blooded animals. They constantly use energy to maintain their body temperature. They have a higher energy needs and require more oxygenated blood for their cells. It is important that their oxygenated blood does not mix up with deoxygenated blood. [/solution]...
Read More →What is a tissue ?
[question] Question. What is a tissue ? [/question] [solution] Solution: Tissue is a group of related cells that have a common origin and perform a common function. [/solution]...
Read More →Which groups of French society benefited from the revolution?
[question] Question. Which groups of French society benefited from the revolution? Which groups were forced to relinquish power? Which sections of society would have been disappointed with the outcome of the revolution? [/question] [solution] Solution: The richer members of the third estate (the middle class) benefitted the most from the French Revolution. The clergy and the nobility were forced to relinquish power. The poorer sections of society and women would have been disappointed with the o...
Read More →What are the components of the transport system in human beings ?
[question] Question. What are the components of the transport system in human beings ? What are the functions of these components ? [/question] [solution] solution: Human transport system has two components, blood vascular system and lymphatic system. Blood Vascular System. It consists of blood, blood vessels (tube) and heart. (1) Heart-It is pumping organ of blood vascular system. (2) Blood- It is made up of plasma and three types of cells – red blood corpuscles, white blood corpuscles and bloo...
Read More →The shells of crabs found around a particular coastal location in Japan seem mostly to resemble the legendary face of a Samurai.
[question] Question The shells of crabs found around a particular coastal location in Japan seem mostly to resemble the legendary face of a Samurai. Given below are two explanations of this observed fact. Which of these strikes you as a scientific explanation? (a) A tragic sea accident several centuries ago drowned a young Samurai. As a tribute to his bravery, nature through its inscrutable ways immortalized his face by imprinting it on the crab shells in that area (b) After the sea tragedy, fis...
Read More →On comparing the ratios $\frac{\mathbf{a}_{1}}{\mathbf{a}_{2}}, \frac{\mathbf{b}_{1}}{\mathbf{b}_{2}}$ and $\frac{\mathbf{c}_{1}}{\mathbf{c}_{\mathbf{z}}}$
[question] Question. On comparing the ratios $\frac{\mathbf{a}_{1}}{\mathbf{a}_{2}}, \frac{\mathbf{b}_{1}}{\mathbf{b}_{2}}$ and $\frac{\mathbf{c}_{1}}{\mathbf{c}_{2}}$, find out whether the following pairs of linear equations are consistent, or inconsistent. (i) $3 x+2 y=5 ; 2 x-3 y=7$ (ii) $2 x-3 y=8 ; 4 x-6 y=9$ (iii) $\frac{\mathbf{3}}{\mathbf{z}} \mathrm{x}+\frac{\mathbf{5}}{\mathbf{3}} \mathrm{y}=7 ; 9 \mathrm{x}-10 \mathrm{y}=14$ (iv) $5 x-3 y=11 ;-10 x+6 y=-22$ (v) $\frac{\mathbf{4}}{\mat...
Read More →Carry out the following osmosis experiment.
[question] Question. Carry out the following osmosis experiment. Take four peeled potato halves and hollow each one out to make potato cups. One of these potato cups should be made from the boiled potato. Put each potato cup in the trough containing water. Now (a) Keep cup A empty. (b) Put one tea spoon sugar in cup B. (c) Put one tea spoon of salt in cup C. (d) Put one tea spoon sugar in boiled cup D. Keep this set up for two hours. Then observe the four potato cups and answer the following: (i...
Read More →How are the lungs designed in human
[question] Question. How are the lungs designed in human beings to maximize the area for exchange of gases. [/question] [solution] solution: Each lung has a highly branched respiratory tract called respiratory tree. A primary bronchus divides into secondary bronchi, secondary into segmental bronchi, segmental bronchus into bronchioles which divide into terminal bronchioles, respiratory bronchioles, alveolar sacs and alveoli. Alveoli are small rounded pouches which are extremely thin walled and p...
Read More →What is osmosis ?
[question] Question. What is osmosis ? [question] [solution] Solution: Osmosis is diffusion of water from the region of its higher concentration (pure water or dilute solution) to the region of its lower concentration (strong solution) through a semiper meable membrane. [/solution]...
Read More →Manoj went to a college to apply for admission into an MBA course.
[question] Question. Manoj went to a college to apply for admission into an MBA course. The clerk refused to take his application and said “You, the son of a sweeper, wish to be a manager! Has anyone done this job in your community? Go to the municipality office and apply for a sweeper’s position”. Which of Manoj’s fundamental rights are being violated in this instance? Spell these out in a letter from Manoj to the district collector. [/question] [solution] Solution: Right to equality and Right ...
Read More →How is oxygen and carbon dioxide
[question] Question. How is oxygen and carbon dioxide transported in human beings? [/question] [solution] solution: Oxygen : (i) 97% in combined state with haemoglobin called oxyhaemoglobin. (ii) 3% dissolved in plasma. Carbon dioxide : (i) 5–7% as dissolved in plasma. (ii) 70% as sodium bicarbonate in plasma. (iii) 23% in combined state with haemoglobin called carbaminohaemoglobin. [/solution]...
Read More →What are thedifferent ways in which glucose is oxidised
[question] Question. What are thedifferent ways in which glucose is oxidised to provide energy in various organisms? [/question] [solution] solution: The different ways in which glucose is oxidised to provide energy in various organisms 1. Aerobic respiration 2.Anaerobic respiration Fermentation [Alcohol fermentation] : Anaerobic respiration in muscle cells [Lactic acid fermentation]: [/solution]...
Read More →Are these restrictions on the right to freedom justified?
[question] Question. Are these restrictions on the right to freedom justified? Give reasons for your answer. (a) Indian citizens need permission to visit some border areas of the country for reasons of security. (b) Outsiders are not allowed to buy property in some areas to protect the interest of the local population. (c) The government bans the publication of a book that can go against the ruling party in the next elections. [/question] [solution] Solution: Restriction ‘a’ is justified to prot...
Read More →How does Amoeba obtain food ?
[question] Question. How does Amoeba obtain food ? [/question] [solution] Solution: Plasma membrane of Amoeba is flexible. With its help, Amoeba engulfs food particle. The engulfed food particle passes into the body of Amoeba as a phagosome. Phagosome com bines with lysosome to produce digestive or food vacuole. Digestion occurs in food vacuole. The digested food passes into surrounding cytoplasm. The undigested matter is thrown out of the cell. [/solution]...
Read More →Which of these statements about the relationship between democracy and rights is more valid?
[question] Question. Which of these statements about the relationship between democracy and rights is more valid? Give reasons for your preference. (a) Every country that is a democracy gives rights to its citizens. (b) Every country that gives rights to its citizens is a democracy. (c) Giving rights is good, but it is not necessary for a democracy. [/question] [solution] Solution: Statement ‘a’ is more valid. Every country which provides rights to its citizens might not be a democracy but it is...
Read More →Name the Fundamental Right under which each of the following rights falls:
[question] Question. Name the Fundamental Right under which each of the following rights falls: (a) Freedom to propagate one’s religion (b) Right to life (c) Abolition of untouchability (d) Ban on bonded labour [/question] [solution] Solution: (a) Right to freedom of religion (b) Right to freedom (personal liberty) (c) Right to equality (d) Right against exploitation [/solution]...
Read More →Where do the lipids and proteins constituting
[question] Question. Where do the lipids and proteins constituting the cell membrane get synthesised ? [question] [solution] Solution: Proteins are synthesised over ribosomes of RER while lipid are synthesised over SER. [/solution]...
Read More →What advantage over an aquatic organism does a terrestrial organism
[question] Question. What advantage over an aquatic organism does a terrestrial organism have with regard to obtaining oxygen for respiration? [/question] [solution] solution: Air contains about $21 \%$ of oxygen while water has less than $1 \%$ oxygen in dissolved state. A terrestrial organism is able to get several times more oxygen than an aquatic organism. [/solution]...
Read More →Which of the following rights is available under the Indian Constitution?
[question] Question. Which of the following rights is available under the Indian Constitution? (a) Right to work (b) Right to adequate livelihood (c) Right to protect one’s culture (d) Right to privacy [/question] [solution] Solution: (c) Right to protect one’s culture [/solution]...
Read More →Which of the following freedoms is not available to an Indian citizen?
[question] Question. Which of the following freedoms is not available to an Indian citizen? (a) Freedom to criticise the government (b) Freedom to participate in armed revolution (c) Freedom to start a movement to change the government (d) Freedom to oppose the central values of the Constitution [/question] [solution] Solution: (b) Freedom to participate in armed revolution (c) Freedom to start a movement to change the government (d) Freedom to oppose the central values of the Constitution [/sol...
Read More →What organelle is known as
[question] Question. What organelle is known as power house of the cell ? Why ? [question] [solution] Solution: Mitochondria is known as power house of the cell because it produces most of the molecules of ATP (adenosine triphosphate) which are required for providing energy for synthesis of new chemicals, mechanical and other cellular functions. [solution]...
Read More →How is small intestine designed to
[question] Question. How is small intestine designed to absorb digested food ? [/question] [solution] solution: Small intestine is lined by epithelium which is specialised to absorb. It has mechanism to increase its absorbing surface area several times. (i) Villi are transverse folds of intestine wall that not only increase surface area but also reach deep into the lumen of intestine for absorption of digested food. Villi possess blood capillaries and lacteals (lymph vessels) for quick transport...
Read More →Which of the following is not an instance of an exercise of a fundamental right?
[question] Question. Which of the following is not an instance of an exercise of a fundamental right? (a) Workers from Bihar go to the Punjab to work on the farms (b) Christian missions set up a chain of missionary schools (c) Men and women government employees get the same salary (d) Parents’ property is inherited by their children [solution] Solution: (d) Parents’ property is inherited by their children [/solution]...
Read More →What would happen to the life
[question] Question. What would happen to the life of a cell if there was no Golgi apparatus ? [/question] [solution] Solution: There would not be any lysosome for intracellular digestion and cleansing, no complexing of molecules, no excretion and no formation of new plasma membrane. [/solution]...
Read More →On comparing the ratios $\frac{\mathbf{a}_{1}}{\mathbf{a}_{8}}, \frac{\mathbf{b}_{1}}{\mathbf{b}_{2}}$ and $\frac{\mathbf{c}_{1}}{\mathbf{c}_{2}}$, find out whether the lines representing the
[question] Question. On comparing the ratios $\frac{\mathbf{a}_{1}}{\mathbf{a}_{2}}, \frac{\mathbf{b}_{1}}{\mathbf{b}_{2}}$ and $\frac{\mathbf{c}_{1}}{\mathbf{c}_{2}}$, find out whether the lines representing the following pairs of linear equations intersect at a point, are parallel or coincident. (i) $5 x-4 y+8=0 ; 7 x+6 y-9=0$ (ii) $9 x+3 y+12=0 ; 18 x+6 y+24=0$ (iii) $6 x-3 y+10=0 ; 2 x-y+9=0$ [/question] [solution] Solution: (i) $5 x-4 y+8=0$ ...(i) $7 x+6 y-9=0$ ...(ii) $\frac{a_{1}}{a_{2}}...
Read More →