Guess Paper No. 1
Total Marks: 83 (Subjective Type) Time Allowed: 3:10 hours
Q.2 Write answers of any Eight questions: (8 x 2 = 16)
(i) Which process is most important at individual level organization?
Ans. Coordination between different organ and systems is most important at individual level organization. An individual cannot survive without it.
(ii) Differentiate between organic and inorganic molecules?
Ans. Organic: The molecules containing both carbon and hydrogen together are called organic molecules.
Inorganic: The molecules without carbon and hydrogen together are called inorganic molecules.
(iii) Why are amino acids so reactive and form new peptide bonds?
Ans. Amino acids have two most reactive groups at both ends. Amine group at one end has Hydrogen atom and carboxylic group at the other end have OH group. So amino acids are reactive at both ends and can easily form new peptide bonds.
(iv) Give two functions of proteins?
Ans. (i) They build many structures of the cells like cell membrane.
(ii) All enzymes are protein in nature. These enzymes control the metabolism of cell.
(v) What is energy of activation? what is its relation with enzyme?
Ans. The minimum amount of energy required to start a reaction is called activation energy. Enzyme decreases the activation enzyme. So reaction takes place in less time.
(vi) What is induced fit model? Who did propose it?
Ans. This model was proposed Koshland in 1959. He describes that when a substrate combines with an enzyme, it induces changes in the enzyme structure. These changes enable the enzyme to perform its catalytic activity. This is also called "Hand Glove" model.
(vii) Give salient features of cell theory?
Ans. (i) All organisms are composed of one or more cells.
(ii) All cells arise from pre-existing cells.
(iii) Cell is the basic structural and functional unit of all the organisms.
(viii) What is resolution of eye? How can the resolution of eye be improved?
Ans. The human eye can differentiate between two points, which are at least 1.0 mm apart. This is known as resolution of eye. The resolution of eye can be improved by the use of microscopes.
(ix) What is virion? Name its different parts?
Ans. The complete virus is called virion. It is composed of central core, Capsid, and envelop. Virion is outside the living organism.
(x) Why are retroviruses so dangerous and drugs do not kill them?
Ans. The retroviruses change their RNA into DNA by enzyme reverse transcriptase. This DNA is incorporated in the DNA of host in form of provirus. So it cannot destroy in this form.
(xi) What are three types of bacteria on the basis of shape? Give differences among them?
Ans. The three types of bacteria are cocci, bacilli and spirilla. Cocci are spherical or oval bacteria. Bacilli are rod shaped bacteria. The spiral shaped bacteria are spirally coiled.
(xii) Name a parasitic amoeba what disease does it cause?
Ans. Entamoeba histolytica is an intestinal parasite. It causes amoebic dysentery in humans
(xii) What is photophosphorylation?
Ans. The synthesis of ATP due to light energy is called photophosphorylation. Its mechanism is chemiosmosis.
(ii) Differentiate between organic and inorganic molecules?
Ans. Organic: The molecules containing both carbon and hydrogen together are called organic molecules.
Inorganic: The molecules without carbon and hydrogen together are called inorganic molecules.
(iii) Why are amino acids so reactive and form new peptide bonds?
Ans. Amino acids have two most reactive groups at both ends. Amine group at one end has Hydrogen atom and carboxylic group at the other end have OH group. So amino acids are reactive at both ends and can easily form new peptide bonds.
(iv) Give two functions of proteins?
Ans. (i) They build many structures of the cells like cell membrane.
(ii) All enzymes are protein in nature. These enzymes control the metabolism of cell.
(v) What is energy of activation? what is its relation with enzyme?
Ans. The minimum amount of energy required to start a reaction is called activation energy. Enzyme decreases the activation enzyme. So reaction takes place in less time.
(vi) What is induced fit model? Who did propose it?
Ans. This model was proposed Koshland in 1959. He describes that when a substrate combines with an enzyme, it induces changes in the enzyme structure. These changes enable the enzyme to perform its catalytic activity. This is also called "Hand Glove" model.
(vii) Give salient features of cell theory?
Ans. (i) All organisms are composed of one or more cells.
(ii) All cells arise from pre-existing cells.
(iii) Cell is the basic structural and functional unit of all the organisms.
(viii) What is resolution of eye? How can the resolution of eye be improved?
Ans. The human eye can differentiate between two points, which are at least 1.0 mm apart. This is known as resolution of eye. The resolution of eye can be improved by the use of microscopes.
(ix) What is virion? Name its different parts?
Ans. The complete virus is called virion. It is composed of central core, Capsid, and envelop. Virion is outside the living organism.
(x) Why are retroviruses so dangerous and drugs do not kill them?
Ans. The retroviruses change their RNA into DNA by enzyme reverse transcriptase. This DNA is incorporated in the DNA of host in form of provirus. So it cannot destroy in this form.
(xi) What are three types of bacteria on the basis of shape? Give differences among them?
Ans. The three types of bacteria are cocci, bacilli and spirilla. Cocci are spherical or oval bacteria. Bacilli are rod shaped bacteria. The spiral shaped bacteria are spirally coiled.
(xii) Name a parasitic amoeba what disease does it cause?
Ans. Entamoeba histolytica is an intestinal parasite. It causes amoebic dysentery in humans
Q.3 Write answers of any Eight questions: (8 x 2 = 16)
(i) How are Foraminifer source of lime stone?
Ans. Dead Foraminiferans sink to the bottom of the ocean. They form grey mud, this grey mud gradually transformed into chalk. The old and dead Foraminiferans are changed into limestone deposits.
(ii) Differentiate between Ectomycorrhlizae and Endomycorrhlizae?
Ans. In case of Endomycorrhizea, the fungal hyphae penetrate into the cell wall of the plant root. In case of Ectomycorrhlizae, the hyphae surround and extend between the cells. But they do not penetrate into the cell wall of the root cells.
(iii) Give two terrestrial adaptations in fungi?
Ans. Fungi develop extensive system of fast spreading hyphae. The hyphae penetrate into the substrate. Thus they increase the contact and the surface area for absorption. The cell wall of hyphae
is made up of chitin.
(iv) Why is adiantum called as maiden hair ferm?
Ans. The stipe (stalk) and rachis of leaf of adiantum are black, smooth and shiny. Hence it is called maiden hair fern.
(v) Why did the gymnospers have naked seed and it failed to form fruit?
Ans. the megasporophlls cover ovule. These sporophylls are not folded or joined at the margins to from an ovary. That is why, seed are naked on megasporophyll. So it could not develop fruit.
(vi) What are protozoa and metazoa ?
Ans. Metazoa includes all multicellular animals like man.Protozoa includes all unicellular animals like amoeba amoeba.
(vii) What is pseudocoelom and pseudocoelomate?
Ans. The animals with false coelom developed from blastocoel are called pseudocoelomate. The space between the body wall and the digestive tube is called pseudocoelom.
(viii) What is Ark-e-Gulab? Give its uses?
Ans. The petal of rose give Ark-e-Gulab on distillation with water. This Ark-e-Gulab is used for curing eye disease and for many other purposes.
(ix) Differentiate between polyp and medusa?
Ans. Polyp is a tube like structure. It reproduces asexually. While medusa is an umbrella like structure. It reproduce sexually.
(x) What is principal function of xylem?
Ans. The principal function of xylem in the plants is the upward transportation of water and solutes.
(xi) What is NADP? Give its significance?
Ans. NADP is nicotine amide dinucleotide phosphate. Hydrogen is produced by the splitting of water. It reduces NADP* (Nicotine Amide Dinucleotide phosphate) to NADPH + H+. The NADPH2 has reducing power.(xii) What is photophosphorylation?
Ans. The synthesis of ATP due to light energy is called photophosphorylation. Its mechanism is chemiosmosis.
Q.4 Write answers of any SIX questions: (6 x 2 = 12)
(i) What is peristalsis?
Ans. Peristalsis is wave of contraction of the circular and longitudinal muscle which is preceded by wave of relaxation to squeeze the food down into the digestive canal.
(ii) What is constipation?
Ans. It is other extreme condition. In this case, excessive water is absorbed.
(iii) What is common thing between photorespiration and photosynthesis?
Ans. Both the photorespiration and photosynthesis occurs in the presence of light. Both uses RuBP as their reactant.
(iv) What are air sacs in birds? Give their function?
Ans. The lungs of birds have developed several extensions called air sacs. These airs sacs help in the movement of air.
(v) What are lenticels? What is lenticular transpiration?
Ans. The loss of water vapours through the lenticels is called lenticular transpiration. Lenticels are aerating pores in the bark of some plants.
(vi) What are haparin and histamine?
Ans. The Basophils produce heparin. It is substance that inhibits the clotting of blood. These cells also produce histamine. The histamine participates in the allergic reactions.
(vii) What is haemolymph? Can you call it blood?
Ans. The haemolymph is a colourless fluid flow in the haemocoel of the insects. It lacks RBC or haemoglobin, so it is colourless. Blood the insects. Blood means red colour. But still it may be called blood.
(viii) What is Histoplasmosis? How does its infection spread?
Ans. It is a serious infection of lungs. It is caused by inhaling spores of a fungus. This fungus is common in soil contaminated with bird's feaces.
(ix) Define Cardiac Cycle?
Ans. It is the sequence of events, which take place during the completion of one heartbeat. Heartbeat involves three distinct stages.
(i) Relaxation phase-diastole.
(ii) Atria contract-atrial systole.
(iii) Ventricles contract-ventricular systole.
(i) Relaxation phase-diastole.
(ii) Atria contract-atrial systole.
(iii) Ventricles contract-ventricular systole.
Biology Part 1 Intermediate - Solved Guess Paper No. 1 Short Questions
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