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Guess Paper – 2013
Class – X
Subject – Biology
CELL DIVISION
 Differentiate between aster and spindle fiber.
 Draw the diagrams of acrocentric and telocentric .Also differentiate between them.
 2 animals having 19 pairs of chromosomes.
 What’s a tetrad?
 4 nitrogenous bases that form a DNA molecule.
 Full form of DNA.
 Longest phase of the cell cycle.
 Name the phase in which the cell grows.
 Phase in which replication of DNA takes place.
 Spindle fibres are made up of----------- Differentiaite between chiasmata and crossing over.
 Direct cell division is called as –-------------- Give 3 features of interphase.
 What is a sat chromosome?
 What is synapsis?
 Draw the diagram of cell cycle.
 What is DNA finger printing?
 Differentiaite between purines and pyrimidines.
 Pair of chromosomes carrying dissimilar alleles.
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 Gametes have haploid no. of chromosomes. Why?
 The point where crossing over occurs is------ Paired homologous chromosome of zygotene stage are called----- Condensation of chromosomes occurs in ---------- phase.
 Differentiait between S and G2 phase.
 Importance of mitosis and meiosis.
 How does meiosis maintain the chromosomal no.?
GENETICS
 What are allelomorphs?
 Mendel’s law of segregation
 What is sex linked inheritance? Give its two types.
 What is hypertrichosis?
 What are idiosomes?
 Alteration in genetic material that can be inherited------- Differentiate between character and trait.
 What is genome?
 What is the name of the disorder caused in humans due to chromosome mutation?
 What is heredity?
 How is sex determination done in humans?
 What is criss- cross inheritance?
 Define
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 Linkage and cloning
 In a certain species of animals black fur (B) is dominant over brown fur(b).predict a
genotype and phenotype of the offspring when both parents are Bb or have
heterozygous black fur.
 The chemical substance constituting genes.
 The scientific name of the organism on which gregor Mendel had worked on.
 Function of DNA
 Why did Mendel select garden pea. Give 3 reasons.
 Chromosomes which don’t determine the sex of the child.
ABSORPTION BY ROOTS
 What is the function of Mg, Mn, K, and Ca in plant growth?
 Characteristics of root hair for absorption of water
 Define Imbibition ,diffusion ,tonicity, turgidity, turgor pressure, wall pressure,
osmosis, plamolysis,Deplasmolysis,root pressure,active transport, passive transport.
 Differentiate between osmosis and diffusion
 Differentiate between cobalt chloride paper and goat’s bladder.
 Salt and sugar are used in preserving food. Why?
 Some plants show wilting of leaves during midday. Why?
 On sprinkling salt on grass in a lawn, the grass is killed. Why?
 Strips of carrot placed in 50% sucrose solution appear soft and shriveled. Why?
 Give 3 functions of phloem
 Define isotonic, hypertonic, and hypotonic.
 If the cell possessed chloroplasts, where would they have been and what would the
colour of it be?
 Explain why salt is added to pickles.
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 Unique property of water which make it to rise in tall plants.
 What is total or evident plasmolysis? How it differs from incipient plasmolysis?
 Example of osmosis in humans
 Bacteria and fungi don’t grow in pickles, jams and jellies. Why?
 We gargle with salt water during throat infection. Why?
 Give 4 examples of semi permeable membranes.
 What is suction force?
 Fresh water fish cannot survive in sea water. Why?
 What is cohesive and adhesive force?
 Wilted lettuce become cold and crisp when placed in cold water. Why?
 Organ that transports water from soil to other parts of the plant.
 What is the kind of cells in the cortex of a root?
 Differentiate between osmosis and turgor pressure.
 What is wilting?
 Importance of osmosis and turgidity to plants.
 Why is root hair one celled?
 Write an experiment to show transpiration pull.
Paper Submitted By:
Name Lalitha Tanmayi
Email
tanmayi.manukonda@gmail.com
Phone No.
9493202432
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