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Recent questions tagged sec-e
Questions
What role does pituitary gonadotropins play during follicular , ovulatory phases of menstrual cycle?
cbse
class12
ch3
exemplar
theoryquestion
biology
sec-e
human reproduction
asked
Jun 20, 2017
by
pady_1
1
answer
Meiotic division during oogenesis is different from that in spermatogenesis. Explain how and why?
cbse
class12
ch3
exemplar
theoryquestion
biology
sec-e
human reproduction
asked
Jun 19, 2017
by
pady_1
1
answer
What role does pituitary gonadotropins play during follicular , ovulatory phases of menstrual cycle?
cbse
class12
ch3
exemplar
theoryquestion
biology
sec-e
human reproduction
asked
Jun 16, 2017
by
pady_1
1
answer
Embryosac of some apomictic species appear normal but come from diploid cells. Suggest a suitable ex
cbse
class12
ch2
exemplar
theoryquestion
biology
sec-e
sexual reproduction in plants
asked
Jun 14, 2017
by
pady_1
1
answer
Embryosac of some apomictic species appear normal but come from diploid cells. Suggest a suitable ex
cbse
class12
ch2
exemplar
theoryquestion
biology
sec-e
sexual reproduction in plants
asked
Jun 14, 2017
by
pady_1
1
answer
Embryosac of some apomictic species appear normal but come from diploid cells. Suggest a suitable ex
cbse
class12
ch2
exemplar
theoryquestion
biology
sec-e
sexual reproduction in plants
asked
Jun 14, 2017
by
pady_1
1
answer
Differentiate between (a) Oestrous and Menstrual cycles; (b) Ovipary and Vivipary. Cite an example f
cbse
class12
ch1
exemplar
theoryquestion
biology
sec-e
reproduction in organisms
asked
Jun 14, 2017
by
pady_1
1
answer
Enumerate the differences between asexual and sexual reproduction.
cbse
class12
ch1
exemplar
theoryquestion
biology
sec-e
reproduction in organisms
asked
Jun 14, 2017
by
pady_1
1
answer
Rose plants produce large, attractive bisexual flowers, but they seldom produce fruits. On the other
cbse
class12
ch1
exemplar
theoryquestion
biology
sec-e
reproduction in organisms
asked
Jun 12, 2017
by
pady_1
1
answer
Rose plants produce large, attractive bisexual flowers, but they seldom produce fruits. On the other
cbse
class12
ch1
exemplar
theoryquestion
biology
sec-e
reproduction in organisms
asked
Jun 12, 2017
by
pady_1
1
answer
Although sexual reproduction is a long drawn, energy intensive complex form of reproduction, many gr
cbse
class12
ch1
exemplar
theoryquestion
biology
sec-e
reproduction in organisms
asked
Jun 12, 2017
by
pady_1
1
answer
Do all the gametes formed from a parent organism have the same genetic composition (identi
cbse
class12
ch1
exemplar
theoryquestion
biology
sec-e
reproduction in organisms
asked
Jun 12, 2017
by
pady_1
1
answer
Explain the structure of a typical angiospermic anther.
cbse
class12
ch2
exemplar
theoryquestion
biology
sec-e
sexual reproduction in plants
asked
Jun 9, 2017
by
pady_1
1
answer
Name the following compounds according to IUPAC system of nomenclature $(i)CH_3CH(CH_3)CH_2CH_2CHO \\ (ii)CH_3CH_2COCH(C_2H_5)CH_2CH_2Cl \\ (iii) CH_3CH = CHCHO \\ (iv) CH_3COCH_2COCH_3 \\ (v) CH_3CH(CH_3)CH_2C(CH_3)_2COCH_3 \\ (vi) (CH_3)_3CCH_2 COOH \\ (vii) OHCC_6H_4CHO-P$
cbse
class12
chemistry
sec-e
ch-12
aldehydes-ketones-and-carboxylic-acids
asked
Dec 29, 2016
by
meena.p
1
answer
(a) The actinoids exhibit more number of oxidation states and give their common oxidation states. (b)A wellknown orange crystalline compound (A) when burnt impart violet colour to flame. (A) on treating (B) and conc. $H_2SO_4$ gives red gas (C) which gives red yellow solution (D) with alkaline water. (D) on treating with acetic acid and lead acetate gives yellow p. pt. (E). (B) sublimes on heating. Also on heating (B) with NaOH gas (F) is formed which gives white fumes with HCl. What are (A) to (F) ?
cbse
class12
chemistry
sec-e
ch-8
d-and-f-block-elements
asked
Dec 29, 2016
by
sharmaaparna1
1
answer
An alcohol A $(C_4H_{10}O)$ on oxidation with acidified potassium dichromate gives carboxylic acid B $(C_4H_8O_2)$. Compound A when dehydrated with conc. $H_2SO_4$ at $443 \;K$ gives compound C. Treatment of C with aqueous $H_2SO_4$ gives compound D $(C_4H_{10}O)$ which is an isomer of A. Compound D is resistant to oxidation but compound A can be easily oxidised. Identify A, B, C and D and write their structures
cbse
class12
chemistry
sec-e
ch-11
alcohols-phenols-and-ethers
asked
Dec 29, 2016
by
meena.p
1
answer
An organic compound A having molecular formula $C_6H_6O$ gives a characteristic colour with aqueous $FeCl_3$ . When A is treated with $NaOH$ and $CO_2$ at $400\;K$ under pressure, compound B is obtained. Compound B on acidification gives compound C which reacts with acetyl chloride to form D which is a popular pain killer. Deduce the structure of A, B, C and D. What is the common name of Drug D?
cbse
class12
chemistry
sec-e
ch-11
alcohols-phenols-and-ethers
asked
Dec 29, 2016
by
meena.p
1
answer
A, B and C are three complexes of Chromioum with the empirical formula $H_{12}O_{6}Cl_3Cr$. All the three complexes have $Cl$ and $H_2O$ molecules as the ligands. Complex A does not react with conc. $H_2SO_4$. Complexes $B$ and $C$ lose $6.75\%$ and $13.5\%$ of their original weight respectively on heating with conc. $H_2SO_4$. Identify A, B and C.
cbse
class12
chemistry
sec-e
ch-9
coordinate-compounds
asked
Dec 28, 2016
by
meena.p
1
answer
Explain the causes for biodiversity loss.OR Look at the diagram and answer the following questions:a.)Name the ecological terms used to describe DDT accumulation at different trophic levels. b.)State an effect of DDT accumulation in birds.c)Will DDT accumulation lead to eutrophication?d)Does it affect BOD? e)Name a disease caused by the accumulation of a heavy metal.
cbse
class12
biology
botany
sec-e
asked
Dec 28, 2016
by
meena.p
1
answer
Differentiate between replication and transcription or OR Describe the process of translation
cbse
class12
biology
zoology
sec-e
asked
Dec 28, 2016
by
meena.p
1
answer
What is spermatogenesis? Describe the process of spermatogenesis.or Briefly explain the various technologies to assist an infertile couple to have children.
cbse
class12
biology
zoology
sec-e
asked
Dec 28, 2016
by
meena.p
1
answer
An oil company has two depots A and B with capacities of 7000 L and 4000 L respectively. The company is to supply oil to three petrol pumps, D, E and F whose requirements are 4500L, 3000L and 3500L respectively. Assuming that the transportation cost of 10 litres of oil is Rs 1 per km, How should the delivery be scheduled in order that the transportation cost is minimum ? What is the minimum cost? The distance (In km) between the depots and the petrol pumps is given in the following table :
cbse
class12
maths
ch1
sec-e
asked
Dec 27, 2016
by
priyanka.c
1
answer
Suppose a girl throws a die. If she throws a 5 or 6, she tosses a coin 3 times and notes the number of heads. If she gets 1, 2, 3 or 4, she tosses a coin once and notes whether a head or tail is obtained. If she obtained exactly one head, what is the probability that she threw 1, 2, 3 or 4 with a die?
cbse
class12
maths
ch13
sec-e
asked
Dec 27, 2016
by
priyanka.c
1
answer
Find the area of the region $\{ (x,y) : 0 \leq y \leq x^2, 0 \leq y \leq x+2 , 0 \leq x \leq 3\}$
cbse
class12
maths
ch1
sec-e
asked
Dec 27, 2016
by
priyanka.c
1
answer
What is noise pollution? Discuss the source and effects of noise pollution. How can noise pollution be controlled? or Give an account of hydrarch succession.
cbse
class12
biology
zoology
sec-e
asked
Dec 27, 2016
by
meena.p
1
answer
Provide experimental evidence for semi conservative mode of replication. Meselson and Stahl in 1957 gave experimental evidences that each DNA strand served as a template for new synthesis, a process called semi conservative replication.
cbse
class12
biology
zoology
sec-e
asked
Dec 27, 2016
by
meena.p
1
answer
Find the image of the point (1, 3. 4) in the plane $x-y+z =5$. Hence show that the image lies on the plane $x -2y +z -7 = 0$
cbse
class12
maths
ch1
sec-e
asked
Dec 27, 2016
by
priyanka.c
1
answer
Draw a labeled diagram of a L.S. of a flower to show the growth of the pollen tube reaching the egg apparatus. Pistil of the flower does not accept pollen from any other plant other than its own kind. How does it happen? Explain or Discuss the modes of action and advantages/disadvantages of hormonal contraceptives
cbse
class12
biology
botany
sec-e
asked
Dec 27, 2016
by
meena.p
1
answer
What are the causes of water pollution? How can water pollution be controlled? Explain the various attributes of population
cbse
class12
biology
zoology
sec-e
asked
Dec 23, 2016
by
meena.p
1
answer
What does Hardy-Weinberg’s principle state? What are the factors that affect Hardy Weinberg’s equilibrium?Discuss the characteristics of a genetic code.
cbse
class12
biology
zoology
sec-e
asked
Dec 23, 2016
by
meena.p
1
answer
Explain female human reproductive system with the help of a neat labeled diagram.What is meant by population explosion? What are the measures to control over population?
cbse
class12
biology
zoology
sec-e
asked
Dec 23, 2016
by
meena.p
1
answer
Radioactive wastes is to be disposed of in full enclosed lead boxes of inner volume $200 cm^3$. The base of the box has dimension in the ratio 2:1 . What is the inner length of the box. Find the minimum inner surface area of the box.
cbse
class12
maths
ch1
sec-e
asked
Dec 22, 2016
by
priyanka.c
1
answer
Rent -a-car has three different makes of vehicles P, Q and R for hire. These cars are located at stations A and B on either side of a city. Some cars are being rented. In total they have 150 cars. At station A, they have 20% of P, 40% of Q and 30% of R which is 46 cars in total. At station B they have 40% of P, 20% of Q and 50% of R which is 54 cars in total. How many of each cars types does Rent-a -car have ?
cbse
class12
maths
ch1
sec-e
asked
Dec 22, 2016
by
priyanka.c
1
answer
How does an electrostatic precipitator work? Differentiate between predation and parasitism; commensalism and ammensalism
cbse
class12
biology
botany
sec-e
asked
Dec 21, 2016
by
meena.p
1
answer
What is an operon? Explain. or Define bacterial transformation. Who demonstrated experimentally and how?
cbse
class12
biology
zoology
sec-e
asked
Dec 21, 2016
by
meena.p
1
answer
With the help of a neat labeled diagram , describe the reproductive system of human male. or Describe various natural methods of birth control
cbse
class12
biology
zoology
sec-e
asked
Dec 21, 2016
by
meena.p
1
answer
What is extinction of species? Describe the processes that lead to extinction of species .Discuss the cause and effect of global warming . what measures need to be taken to control global warming?
cbse
class12
biology
zoology
sec-e
asked
Dec 20, 2016
by
meena.p
1
answer
What is meant by semi conservative nature of DNA replication? Who proved it and how? What does Oparin-Haldane hypothesis about life suggest? Explain.
cbse
class12
biology
zoology
sec-e
asked
Dec 20, 2016
by
meena.p
1
answer
Describe in brief the events of sexual reproduction.Describe the process of embryo and endosperm formation in flowering plants.
cbse
class12
biology
botany
sec-e
asked
Dec 20, 2016
by
meena.p
1
answer
If the letters of the word 'ASSASSINATION' are arranged at random in a row, find the probability that
(a) four S's come consecutively in the word
(b) All A's not coming together
(c) two I's and two N's come together.
cbse
class12
maths
ch13
sec-e
asked
Dec 19, 2016
by
priyanka.c
1
answer
Give an account of factors affecting rate of decomposition.Write a short note on the pyramid of numbers and pyramid of biomass.
cbse
class12
biology
zoology
sec-e
asked
Dec 19, 2016
by
meena.p
0
answers
Give an account of factors affecting rate of decomposition.Write a short note on the pyramid of numbers and pyramid of biomass.
cbse
class12
biology
zoology
sec-e
asked
Dec 19, 2016
by
meena.p
1
answer
Differentiate between dominance, co dominance and incomplete dominance with an example for each.or A dihybrid heterozygous tall and yellow pea plant was crossed with a double recessive plant.A dihybrid heterozygous tall and yellow pea plant was crossed with a double recessive plant.a)What type of cross is this? b)Work out the genotype and phenotype of progeny c)What principle of Mendel is illustrated through the result of this cross?
cbse
class12
biology
zoology
sec-e
asked
Dec 19, 2016
by
meena.p
1
answer
Explain the formation of an embryo sac with diagrams.or Explain the formation of an embryo sac with diagrams.
cbse
class12
biology
botany
sec-e
asked
Dec 19, 2016
by
meena.p
1
answer
A cooperative society of farmers has 50 hectors of land to grow two crops X and Y. The profit from crops X and Y are estimated on Rs.10,500 and Rs.9000 respectively. To control weeds, a liquid herbicide has to be used crops X and Y at rate of 20 litres and 10 litres per hectors. Further no more than 800 litres of herbicide should be used in order to protect fish and wild life using a pond which collects drainage from this land. How much land should be allocated to each crop so as to maximize the total profit of the society ?
cbse
class12
maths
ch1
sec-e
asked
Dec 12, 2016
by
priyanka.c
1
answer
Find the area bounded by the lines. $x +2y = 2, y = x +1$ and $2x +y= 7$
cbse
class12
maths
ch1
sec-e
asked
Dec 12, 2016
by
priyanka.c
1
answer
Integrate : $\begin{align*} \int \frac{dx}{3+2 \sin x + \cos x} \end{align*}$
cbse
class12
maths
ch7
sec-e
asked
Dec 12, 2016
by
priyanka.c
1
answer
In a game, a man wins a rupee for a six and loses a rupee for any other number when a fair die is thrown. The man decided to throw a die thrice but to quit as and when he gets a six. Find the expected value of the amount he wins / loses.
cbse
class12
maths
ch13
sec-e
asked
Dec 8, 2016
by
priyanka.c
1
answer
Differentiate w.r.t. $x$ the function in $x^x + x^a +a^x+a^a$, for some fixed $a> 0$ and $x>0$
cbse
class12
maths
ch5
sec-e
asked
Dec 8, 2016
by
priyanka.c
1
answer
For what values of $x$ and $y$ are the following matrices equal ? $A = \begin{bmatrix} 2x+1 & 3y \\ 0 & y^2-5y \end{bmatrix} , B = \begin{bmatrix} x+3 & y^2+2 \\ 0 &-6 \end{bmatrix}$
cbse
class12
maths
ch3
sec-e
asked
Dec 8, 2016
by
priyanka.c
1
answer
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