General Knowledge Portal

Q35. Name a few insects without wings. Ans. Lepisma (silver fish), ants termites, bed bug, louse. Q36. Name the branch of science that deals with the study of insects, fishes, amphibians, reptiles,birds. Ans. Insects-Entomology, Fishes-lchthyology Amphibia and Reptilia-Herpetology, Birds- Ornithology. Q37. To which phyla or class the following animals belong; silver fish, devil fish, sea horse, jelly fish, sting ray, whale, bat. Ans. Silver fish-arthropoda; devil fish-mollusca; sea horse-osteichthyes; cuttle fish-mollusca, jelly  fish-coelenterate; sting ray-chondrichthyes; whale-mammalia; bat-mammalia. Q38. What do you mean by a diploblastic animal ? Ans. An animal having body cells arranged in 2 layer: (i) ectoderm and (ii) endoderm. Q39. What are the functions of tentacles in Hydra ? Ans. They help in catching the prey and in locomotion. Q40. Name a few coelenterates other than Hydra ? Ans. Jelly fish, sea-anemone, corals, sea pen, sea fan etc. Q41. What is the commo...

Q1.What are meristematic and permanent tissues ? Where are they present ? Ans. Meristematic tissue grow throughout life and are present in root tip, shoot tip, leaf axil and cambium. Permanent tissues do not divide. These do specific functions, e.g., vascular and ground tissues. Q2. Name two (a)vascular and (b) Ground tissues. Ans. (a) Xylem and phloem (b) Parenchyma and collenchyma. Q3 Give the functions of the following: (a) Parenchyma cells (b) Collenchyma cells (c) Aerenchyma cells. Ans. (a) Parenehyma cells store food and help in short distance transport of food. It forms the  ground (b) Collenchyma eells provide mechanical support. (c) Aerenchyma cells contains air spaces in between the cells of aquatic plants and help them to float Q3.Distinguish between (a) Axial parenehyma and ray parenchyma (b) Fibres and sclereids Ans. (a) In axial parenchyma the cells are arranged vertically and are used for storage of food water and minerals and their vertical, short distan...

Q1. Define the term "inflorescence." Ans. It is "the reproductive shoot bearing number of flowers. Q2.How are the flowers arranged in racemose and cymose inflorescence ? Explain. Ans. In racemose, the flowers are axillary in position arranged in acropetal manner. T'hese are  never borne on tip of the shoot. In cymose, the flowers are stalked, arranged in basipetal order  and are always borne on tip of the shoot. Q3. Give seven types of racemose inflorescence with one example each. Ans. (i)Raceme-radish, (ii) Spike-amaranth, (iii) Catkin-mulberry, (iv) Spadix-banana, (v) Corymb-candituft, (vi) Umbel-coriander, (vii) Capitulum-sunflower. Q4. Classify the following on the basis of type of inflorescence : (a) Mulberry, (b) Ficus (c) Coriander, (d) Jasmine, (e) Calotropis, (f) Banana, (g) Mustard. Ans. (a) Catkin (b) Hypanthodium, (c) Umbel, (d) Dichasial cyme, (e) Polychasial cyme, (f) Spadix, (g) Racemne. Q5.State one differenee between a Spike and a Raceme....

Q1.What is a flower ? Why does it hold an important position in a plant? Ans. Flower is a reproductive shoot of a plant, hence holds an important position. Q2.Name the essential and non-essential whorls of a fower. Why are they so cailed Ans. Androecium and Gynoecium are essential whorls, calyx and corolla are non-essentisl. Q3.Give two examples each of a pedicellate and sessile flowers Ans. Pedicellate-Mustard and pea; Sessile-Wheat and paddy Q4.Match the given flowers with the corresponding features. Flowers: (a) Petunia, (b) Pea, e) Onion Features: (i) Complete, (ii) Zygomorphic, (iii) Gamopetalous Ans(i) Onion, (ii) Pea, (iii) Petunia Q5.What is perianth ? How does it differ from gamopetalous flowers ? Ans.In perianth calyx and corolla cannot be distinguished. Gamopetalous fowers have oniy fused petals. Q6.Pea is a polypetalous whereas Petunia is a gamopetalous flower. What is the differenee between their petals ? Ans. Pea has free petals and Petunia has fused petals. Q...

Q1. Which type of symmetry does Pila shows? Ans. Head and foot shows bilateral symmetry but the visceral mass looses symmetry because of torsion. Q2. Which animals show regeneration ? Ans. Star fish, Planaria. Q3.What is the scientific name of earthworm and round worm ? Ans. Earthworm-Pheretima posthuma and roundworm-Ascaris lumbricoides. Q4. What is the difference between on insect and spider ? Ans. Insects have three pairs of legs while spider has four pairs of legs. Q5. Which animals is called as farmer's friend ? Ans. Earth worm because they make the soil loose by burrowing. Q6. What does Arthropoda means ? Ans. Arthropoda (Arthros = jointed, podos = foot), means jointed legs or appendages. Q7. What is cephalothorax ? Ans. The structure formed by the fusion of head and thorax is termed as cephalothorax. Q8. Give the examples of animals which have segmented body ? Ans. Insects, and earthworms are examples of segmented animals. Q9. Which phylum is characterized by str...

Q.1 What is vernier constant? Ans. The difference between the values of one main scale division and one vernier scale division is called vernier constant Q.2 What is zero error ? Ans. lf zero of main scale does not coincide with zero of vernier scale when the two jaws of the vemier calliper touch each other, the instrument is said to have zero errors. Q.3. What is vernier callipers? Why is it so called ? Ans. Itis an instrument used to measure small length, i.e., fractions of a millimeter accurately. It was invented by French Mathematician Pierre Vernier. Thus this instrument is called Vernier Calli- pers. Q.4. What is meant by least count (LC) of a measuring instrument ? Ans. The least count of a measuring instrument is smallest value of physical quantity which can be measured by the instrument. Q.5. What is meant by zero error of vernier callipers ? Ans. On bringing the of jaws  Vernier callipers in contact with each other, the zero of the vernier scae in some instrum...

Q. 1. What are the functions of tentacles in Hydra? Ans. They help in locomotion and capturing the prey . Q.2. What is the significance of moist skin to the  frog ? Ans. Moist skin helps in respiration (cutaneous respiration). Q.3. What is a hermaphrodite animal ? Ans. The animal that has both male and female sex organs in itself called hermaphrodite animal Q.4. Why are earth worms called farmer's friend ? Ans. Because the earth worms plough the soil by making burrows. Q.5. Give two most important characters of phylum Arthropoda. Ans. Arthropods have jointed legs and non- living chitinous exoskeleton. Q.6. Why do frogs undergo hibernation during winters and aestivation during summerss? Ans. Frog is a cold blooded animal, which does not have constant body temperature. Its body temperature fluctuates with the environment. Therefore, frog get buried in the soil for hibernatior during winter and for aestivation during summer. Q.7. What are metazoan  animals ? Ans. Mult...

Q1.Prop roots are seen in banyan tree not in neem tree. Why ? Ans Prop roots are required for support in hug trees like banyan not the neem tree which is comaretively. Q2 Potato is a stem not a root. Why ? Ans An potato has nodes, internodes and buds which are features of stem not the root. Q3. Both prop and stilt roots are supportive in function. How do they differ from each other ? Ans. Prop roots are strog. hence support huge trees, stilt roots are weak and support shrubs, eg maize Q4.What is tap root? Ans. The root which arise from radicle is called a tap root. Q5 What are adventitious roots ? Ans. The roots which arise from any plant part other than radicle are called adventitious roots. Q6.Which types of roots are found in Dahlia and Asparagus ? Ans. Fascieulated adventitious roots. Q7. What is the diference between roots of Dahlia and Asparagus ? Ans. In Dahila the roots lie at the base of the stem, while in Asparagus clustered roots become fleshy at intervals and no...

Q.1. Define symbiosis. Ans.It is defined an association of two organisms that one mutually benefitted. Example in lichen. Q.2. What are bacteria? Ans. Bacteria are unicellular prokaryotic organisms that reproduce by binary fission. Q.3. What is the study of algae called ? Ans. Phycology. Q.4. What is the study of fungi called ? Ans. Mycology. Q.5. What are thallophytes ? Ans. Thallophytes include algae and fungi. Q.6. What are algae ? Ans. These are green plants included under thallophyta and they are autotrophic. Vascular tissue are lacking in algae. Q.7. What type of organism is a bacteria ? Ans. Bacteria are the unicellular prokaryotic organisms. Q8. Under which branch of seience do you study bacteria ? Ans. Bacteriology. Q.9. Who is Father of Bacteriology ? Ans. Anoton van Leeuwenhoek is known as the Father of Bacteriology. Q. 10. What are thallophytes ? Ans. Thallophytes are the plants which have plant body thallus like, i.e., not differentiated into root,stem and leav...

Q1.What is a microscope? Ans. A microscope is an instrument used to magnify small objects and thus increases the resolution. Q.2. What is the function of a microscope? Ans. Its function is to enlarge near or small objects. Q.3. What type of microscopes are generally used in the school laboratory ? Ans. ) Dissecting microscope and (ii) Compound microscope. Q.4. Define resolving power. Ans. Resolving power may be defines as the ability to distinguish two objects as separate entities. Q.5. What is the role of mirror in a compound microscope ? Ans. To reflect the light on the object so as to illuminate it. Q.6. What is the function of a diaphragm in a microscope ? Ans. It regulates the light falling on the object. Q.7. What type of image do you see by the microscope real or virtual ? Ans. Real image. Q.8. What do you mean by working distance in a microscope ? Ans. This is the distance between the objective lens and the specimen being observed, and it decreases when you move fro...

Q1. What is the Function of seeding in the preparation of crystals? Ans. Seeding facilitates the process of crystallization. Q2. What happens when a hot solution of a salt is allowed to cool very slowly? Ans. Crystals separate out and grow in size slowly. Q3. Why is excess of sulphuric acid avoided in the crystallization of copper sulphate? Ans. It will decrease the yelid of copper and sulphate. Q4. What is Characteristic of crystals? Ans. Crystals have well defined geometry and shape . Q5. Why is crystallisation done? Ans. Crystallisation enables to prepare a substance in state of higest purity. Q6.What is blue vitrol? Ans. Hydrated from of copper sulphate i.e. CUSO⁴.5H²O. Q7. What will be the shape of copper sulphate? Ans. Triclinic shape. Q8. What is seeding ? Ans. Addition of pure crystal in very small amount in the concentrated solution during crystallisation is called seeding. Q9. Wat is crystallization point? Ans. When the formation of crystals starts in the saturate...

Q1. What do you mean by a saturated solution? Ans. No more solute is dissolved at room temperature in a solution is known as a saturated solution. Q2. How does potash alum help in the purification of water? Ans. Dust parricles being negatively charged are coagulated by Al³+ions .Due to this , the dust particles settle down leaving the water clear. Q3. What happens when potash alum is heated? Ans. Potash alum melts at 92°C and 200°C loses all its water of crystallisation and turns to a porous mass .Anhydrous alum is known as burnt alum Q4. Why is water of Crystallisation? Ans. Water of crystallisation is the number of water molecules present in one formula unit of the crystalline substance. Q5. What are the uses of potash alum? Ans. It is used in tanning ,as a mordent for coagulating muddy water, in calico printing and for sizing paper. Q6. What is potash alum? Ans.Potash alum is a double salt having formula K²SO⁴.Al²(SO⁴)³.24H²O. Q7. What will be the shape of potash alum? A...

Q1. Define boiling point of a liquid ? Ans. The boiling point of a liquid is the temperature at which its vapour pressure is equal to the atmospheric pressure and the liquid starts boiling. Q2. What is the importance of boiling point? Ans. Every pure liquid has a fixed boiling point . Impurities raise the boiling point of a liquid. Therefore from boiling point determination one can find out whether a substance is pure or not. Q3. Why should the open-end of the capillary be kept above the liquid level? Ans. Otherwise liquid will enter into the capillary tube and the substances will dissolve. Q4. Can the same organic liquid boil at different temperatures? Ans. Yes, because the boiling point of liquid varies with the external pressure. Q5.If a small amount of non-volatile is added to a pure liquid ,would it boil as its boiling point? Ans.No, the boiling point will be slightly higher. Q6. What is the effect of pressure on boiling point? Ans. The boiling point decreases with dec...

Q1. Define melting point. Ans. Melting point is the temperature at which solid and liquid states of a substance co-exist or it is the temperature at which a solid on heating changes into its liquid form. Q2. What is a sharp melting point? Ans. The melting is termed sharp when a solid is completely melted within a range of 1°C. Q3. What is the effect of impurity on the melting point of a solid ? Ans. The melting point of the solid is lowered by the presence of impurity. Q4. What is the criteria of purity of a solid? Ans. It is pure if its melting point is sharp and does not change on purification of the solid. Q5. Do crystalline substances have sharp melting points? Ans. Yes, generally they have sharp melting points. Q6. Why electrovalent compounds have generally high melting points? Ans. The electrovalent compounds are made up of positive and negative ions. There is a strong force of attraction between the oppositely charged ions,so a lot of energy is requried to break this...

Q1. What is the IUPAC name of acetanilide ? Ans. Phenyl ethanamide. Q2. What is acetylation? Ans. The process of replacing hydrogen of hydroxyl or amino group by -----COCH³ group is called acetylation . Q3. Name one acetylating agent ? Ans. Acetic anhydride. Q4. Name the product of acetylation of aniline? Ans. Acetanilide  Q5. What is the Chemical formula of acetanide? Ans.C⁶H⁵NHCOCH³ Q6. What is the colour of pure aniline? Ans. Straw yellow but turns reddish-brown on exposure to air and light. Q7. Why is aniline not nitrated directly? Ans. Because nitric acid oxidizes aniline easily. Q8.What is the melting point of p-nitroacetanilide? Ans. 214°C Q9. What is the colour of p-nitroacetanilide?   Ans. Colourless.  Q10. Name the product obtained by nitration of acetanilide? Ans. P-nitroacetanilide.

Q1. How is acetylene prepared in the laboratory ? Ans. It is prepared in the laboratory by the action of water on calcium carbide. Q2.Why is acetylene gas collected by the downward displacement of water ? Ans. Because it is insoluble in water. Q3. How will you convert acetylene into ethane ? Ans. Acetylene on hydrogenation with hydrogen and nickel as catalyst will get converted to ethane. Q4.How many bonds are present in acetylene ? Ans. Three bonds are present in acetylene  Q5. Is the gas saturated or unsaturated hydrocarbon ? Ans. It is an unsaturated hydrocarbon. Q7. Is acetylene move acidic or more basic than ethane ? Ans. Acetylene is more acidic then ethane. Q8. What is Lindlar's catalyst  ?Give its uses. Ans.Lindlar's catalyst is Pd/BaSO4.It is used to convert alkynes to alkenes with the addition of H2. Q9. Why do alkynes not show geometrical iso-merism? Ans. Alkynes have linear structure.So, they cannot show geometrical isomerism. Q10.Is acetylene gas satur...

Q1.  फ्रांस में फ्रांसीसी क्रांति कब हुई थी?  उत्तर।  १७८९ ई.  प्रश्न २.  फ्रांस की क्रांति के समय फ्रांस का राजा कौन था ?  उत्तर।  लुई सोलहवें।  Q3.  1815 में वाटरलू में ब्रिटेन, रूस, रूस और ऑस्ट्रिया की संयुक्त सेना ने किसे हराया था?  उत्तर।  नेपोलियन।  प्रश्न4.  वियना की संधि कब हुई थी ?  उत्तर।  १८१५ ई.  प्रश्न6.  इनमें से कौन इतालवी एकीकरण के लिए जिम्मेदार था?  (ए) मैज़िनी     (बी)। कैवोर               (सी) गैरीबाल्डी   (डी)। ये सभी  उत्तर।  इन सब।  प्रश्न7.  जर्मन एकीकरण कब हुआ था?  उत्तर।  १८७१ ई.  प्रश्न ८.  जर्मन एकीकरण के बाद किसे जर्मन सम्राट घोषित किया गया था?  उत्तर।  कैसर विलियम I.  Q9. उदारवादियों की क्रांति किस वर्ष हुई थी?  उत्तर।  १८४८ ई.  प्रश्न10.  जर्मनी के एकीकरण में सबसे महत्वपूर्ण भूमिका किसने निभाई?  उत्तर।  ओटो वॉन बिस्मार्क।...