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Recent questions tagged sec-c
Questions
Continued self pollination leads to interbreeding depression. List three devices that flowering plants have developed to discourage self pollination.
cbse
class12
biology
botany
sec-c
asked
Dec 19, 2016
by
meena.p
1
answer
$\begin{align*} \int_{\frac{\pi}{6}} ^\frac{\pi}{3} \frac{dx}{1+\sqrt{\tan x}} \end{align*}$
cbse
class12
maths
ch7
sec-c
asked
Dec 12, 2016
by
priyanka.c
1
answer
Find absolute maximum and minimum value a function given by $f(x) = 12x^{\frac{4}{3}} - 6x^{\frac{1}{3}} , x \in [-1,1]$
cbse
class12
maths
ch1
sec-c
asked
Dec 12, 2016
by
priyanka.c
1
answer
Find the area of the triangle formed where vertices are A (3, -1, 2), B (1, -1, -3) and C (4, -3, 1).
cbse
class12
maths
ch10
sec-c
asked
Dec 10, 2016
by
priyanka.c
1
answer
From a group of 7 men and 4 ladies, a committee o 6 persons is formed. What is the probability that the committee will consist exactly of 2 ladies ?
cbse
class12
maths
ch13
sec-c
asked
Dec 10, 2016
by
priyanka.c
1
answer
Without expanding show that $\begin{vmatrix} x^2+x & x+1 & x-2 \\ 2x^2 +3x-1 & 3x & 3x-3 \\ x^2+2x+3 & 2x-1 & 2x-1 \end{vmatrix} = xA +B$ Also find A and B.
cbse
class12
maths
ch4
sec-c
asked
Dec 9, 2016
by
priyanka.c
1
answer
Three shopkeepers X,Y and Z go to a store to buy stationery items. X purchases 12 dozen marker pens, 5 dozen ink pen and 6 dozen pencils. Y purchases 10 dozen marker pens, 6 dozen ink pen and 7 dozen pencils. Z purchases 11 dozen marker pens, 13 dozen ink pens and 8 dozen pencils. A marker pen cost Rs 40/- , a pen costs Rs. 7/- and a pencil Rs. 1 /- each. Using matrix multiplication calculate the individual bills of X, Y and Z.
cbse
class12
maths
ch3
sec-c
asked
Dec 9, 2016
by
priyanka.c
1
answer
Mention the three major causes for the loss of bio diversity.
cbse
class12
biology
botany
sec-c
asked
Dec 8, 2016
by
meena.p
1
answer
What is the pyramid of biomass? Represent the pyramid of biomass in a )grassland ecosystem b) aquatic ecosystem
cbse
class12
biology
botany
sec-c
asked
Dec 8, 2016
by
meena.p
1
answer
Some multinational companies and other organizations are using bio resources for commercial benefits without proper authentication and compensation to concerned authorities. a. Give the term for this unauthorized act. b. Suggest two ways to get rid of this.
cbse
class12
biology
zoology
sec-c
asked
Dec 8, 2016
by
meena.p
1
answer
Name the biological end product made in transgenic animal to treat emphysema. Explain the same.
cbse
class12
biology
zoology
sec-c
asked
Dec 8, 2016
by
meena.p
1
answer
How will you obtain a purified DNA from a cell?
cbse
class12
biology
botany
sec-c
asked
Dec 8, 2016
by
meena.p
1
answer
Biofortification is the most practical means to improve human health. Justify the statement with examples.What is mutation? Explain the significance of mutation in plant breeding. Give an example of a disease resistant variety of cultivated plant induced by mutation.
cbse
class12
biology
botany
sec-c
asked
Dec 8, 2016
by
meena.p
1
answer
Fill in the blanks in different columns of the table below to identify numbers 1 to 6.
cbse
class12
biology
zoology
sec-c
asked
Dec 8, 2016
by
meena.p
1
answer
Explain test cross with an example and a Punnet squares
cbse
class12
biology
botany
sec-c
asked
Dec 8, 2016
by
meena.p
1
answer
Study the following pedigree chart of a family starting with mother with blood group AB and father with “O” blood group. a. Mention the blood group as well as genotype of the offspring numbered 1 in Generation-II. b. Write the possible blood groups as well as the genotypes of the offspring numbered 2 and 3 in generation III.
cbse
class12
biology
zoology
sec-c
asked
Dec 8, 2016
by
meena.p
1
answer
Illustrate schematically the process of initiation, elongation and termination during transcription of a gene in a bacterium.
cbse
class12
biology
botany
sec-c
asked
Dec 8, 2016
by
meena.p
1
answer
Figures given below are of Darwin’s finches a. Mention the specific geographical area where they are found? b. Name and explain the phenomenon that has resulted in the evolution of such diverse species in the region.c. How did Darwin visit particular geographical area?
cbse
class12
biology
zoology
sec-c
asked
Dec 7, 2016
by
meena.p
1
answer
List the changes that occur during post fertilization in plants.
cbse
class12
biology
botany
sec-c
asked
Dec 7, 2016
by
meena.p
1
answer
What do you mean by latitudinal gradient? What could be the possible reasons for the diversity being greater in tropic than in temperate region?
cbse
class12
biology
zoology
sec-c
asked
Dec 7, 2016
by
meena.p
1
answer
Deforestation is creating a lot of problems in the environment. List the consequences of deforestation.
cbse
class12
biology
botany
sec-c
asked
Dec 7, 2016
by
meena.p
1
answer
Name the four major ecosystem services? Who gave the price tags on nature’s life support services? Which is the most important ecosystem service provided?
cbse
class12
biology
botany
sec-c
asked
Dec 7, 2016
by
meena.p
1
answer
What are the three critical areas of research in bio technology?
cbse
class12
biology
botany
sec-c
asked
Dec 7, 2016
by
meena.p
1
answer
In the given figure,Form (A) and Form (B) represents different forms of a proteinaceous hormone secreted by pancreas in mammals a. What type of bonding is present between the chains of this hormone? b. What are these forms (A) and (B)? How do these forms differ from each other? c. Explain how this hormone was produced by Eli Lilly, an American company?
cbse
class12
biology
zoology
sec-c
asked
Dec 7, 2016
by
meena.p
1
answer
Since DNA is hydrophilic, it cannot pass through the cell membrane. Name and explain the technique that DNA is forced into a) bacterial cell b) a plant cell c) an animal cell.
cbse
class12
biology
botany
sec-c
asked
Dec 6, 2016
by
meena.p
1
answer
What are bio fertilizers? A farmer was advised to add a culture of the bacterium in the soil before sowing the crop. Name the bacterium in the culture. How is this bacterium useful to the crop?
cbse
class12
biology
botany
sec-c
asked
Dec 6, 2016
by
meena.p
1
answer
How can we increase the success rate of fertilization during artificial insemination in animal husbandry programme?
cbse
class12
biology
zoology
sec-c
asked
Dec 6, 2016
by
meena.p
1
answer
Mention three causes of drug abuse. Suggest some measure for the prevention and control of drug abuse.
cbse
class12
biology
zoology
sec-c
asked
Dec 6, 2016
by
meena.p
1
answer
Which part of the world, Neanderthal man lived? What was his brain capacity? Mention the advancement which Neanderthal man showed over **** erectus.
cbse
class12
biology
zoology
sec-c
asked
Dec 6, 2016
by
meena.p
1
answer
In Antirrhinum majus, a plant with red flower was crossed with white flowers. Work out all the possible genotypes and phenotypes of $F_1$ and $F_2$ generations. Comment on the pattern of inheritance in this case. or Enlist the goals of Human Genome Project.
cbse
class12
biology
botany
sec-c
asked
Dec 6, 2016
by
meena.p
1
answer
Distinguish between gametogenesis and embryogenesis.
cbse
class12
biology
zoology
sec-c
asked
Dec 6, 2016
by
meena.p
1
answer
What is biological magnification? Explain how DDT as a water pollutant undergoes biological magnification.and Species facing competition might evolve mechanism that promotes coexistence rather than exclusion. Justify this statement in light of Gauss’ competitive exclusion principle, citing a suitable example.
cbse
class12
biology
zoology
sec-c
asked
Dec 5, 2016
by
meena.p
1
answer
What do you mean by bio diversity? What are the different types of bio diversity?
cbse
class12
biology
zoology
sec-c
asked
Dec 5, 2016
by
meena.p
1
answer
Mention the tools required for genetic engineering technology.
cbse
class12
biology
botany
sec-c
asked
Dec 5, 2016
by
meena.p
1
answer
Plasmid is a boon to biotechnology. Justify your statement quoting the production of human insulin as an example.
cbse
class12
biology
botany
sec-c
asked
Dec 5, 2016
by
meena.p
1
answer
Describe any three vector less methods of introducing rDNA into a competent host cell.
cbse
class12
biology
botany
sec-c
asked
Dec 5, 2016
by
meena.p
1
answer
What is biological oxygen demand test? At what stage of sewage treatment is this test performed? BOD levels of three samples of water labeled as A,B and C are $30\;mg/ml, 10\;mg/ml$ and $500\;mg/ml$ respectively. Which sample of water is most polluted?
cbse
class12
biology
zoology
sec-c
asked
Dec 5, 2016
by
meena.p
1
answer
What is mutation? Explain the significance of mutation in plant breeding. Give an example of disease resistant variety of cultivated plants induced by mutation.
cbse
class12
biology
botany
sec-c
asked
Dec 5, 2016
by
meena.p
1
answer
In the figure, structure of the antibody molecule is shown. Observe it and give the answers to the following:a) Label the parts A,B and C.b)Which cell produces these chemicals? c) State the function of this molecule.
cbse
class12
biology
zoology
sec-c
asked
Dec 5, 2016
by
meena.p
1
answer
Stanley Miller and Urey performed an experiment by recreating in the laboratory the probable conditions of the primitive atmosphere of the earth. a.What was the aim of the experiment? b.In what form was the energy supplied for the chemical reactions to occur? c.For how long was the experiment run continuously? Name the two products formed.
cbse
class12
biology
zoology
sec-c
asked
Dec 5, 2016
by
meena.p
1
answer
Explain how hnRNA becomes mRNA?
cbse
class12
biology
botany
sec-c
asked
Dec 2, 2016
by
meena.p
1
answer
In Mendel’s breeding experiment on garden pea, the offspring in $F_2$ generation are obtained in the ratio of $25\%$ pure yellow pod, $50\%$ hybrid green pods and $25\%$ green pods. State a)Which pod is dominant? b)The phenotype of the individuals of $F_1$ generation. c)Work out the cross.
cbse
class12
biology
botany
sec-c
asked
Dec 2, 2016
by
meena.p
1
answer
What are heterogametes? What do we call these gametes individually?
cbse
class12
biology
zoology
sec-c
asked
Dec 2, 2016
by
meena.p
1
answer
With the help of a diagram, represent the energy flow through different trophic level.
cbse
class12
biology
zoology
sec-c
asked
Dec 2, 2016
by
meena.p
1
answer
How does the shape of the pyramid reflect the growth status of a population?
cbse
class12
biology
zoology
sec-c
asked
Dec 2, 2016
by
meena.p
1
answer
What is RNA silencing? How is this strategy used to create pest resistant plants?
cbse
class12
biology
botany
sec-c
asked
Dec 2, 2016
by
meena.p
1
answer
Name the genes responsible for making Bt.cotton plants resistant to boll worm attack. How do such plants attain resistance against bollworm attack?
cbse
class12
biology
botany
sec-c
asked
Dec 2, 2016
by
meena.p
1
answer
Mention the important properties which a good vector must possess. The important properties of a good vector are:
cbse
class12
biology
botany
sec-c
asked
Dec 2, 2016
by
meena.p
1
answer
Fill in the blanks a,b,c,d,e and f in the following table:
cbse
class12
biology
botany
sec-c
asked
Dec 2, 2016
by
meena.p
1
answer
What is micro propagation? Why are plants produced by this technique called soma clones? Name any two food plants that are produced on commercial basis using this method?
cbse
class12
biology
botany
sec-c
asked
Dec 2, 2016
by
meena.p
1
answer
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