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.
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
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.
Unique property of water whichmake 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:
NameLalitha Tanmayi
Phone No.9493202432
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