List of top Questions asked in CBSE CLASS XII

Suggest the aspects of reproductive health which need to be given special attention in the present scenario.

Find the area bounded by curves(x-1)²+y²=1 and x²+y²=1

Can you think and answer how a reporter enzyme can be used to monitor transformation of host cells by foreign DNA in addition to a selectable marker?

Can you recall meiosis and indicate at what stage a recombinant DNA is made?

Name the functions of the following.

1. Corpus luteum
2. Endometrium
3. Acrosome
4. Sperm tail
5. Fimbriae

Differentiate between:

1. Hypocotyl and epicotyl;
2. Coleoptile and coleorrhiza;
3. Integument and testa;
4. Perisperm and pericarp

Area of the region bounded by the curve y²=4x, y-axis and the line y=3 is

Fill in the blanks:

1. Human Reproduction _____________ .(asexually/sexually)
2. Humans are _________. (oviparous/viviparous/ovoviviparous)
3. Fertilization is __________in humans. (external/internal)
4. Male and female gametes are __________. (diploid/haploid)
5. Zygote is ___________. (diploid/haploid)
6. The process of release of the ovum from a mature follicle is called _____________.
7. Ovulation is induced by a hormone called the __________.
8. The fusion of the male and the female gametes is called ____________.
9. Fertilization takes place in the __________.
10. The zygote divides to form __________, which is implanted in uterus.
11. The structure which provides vascular connection between the fetus and uterus is called __________.

What is triple fusion? Where and how it take place? Name the nuclei involved in triple fusion.

What is bagging technique? How is it useful in a plant breeding programme?

Area lying in the first quadrant and bounded by the circle x²+y²=4 and the lines x=0 and x=2 is

What are chasmogamous flower? Can cross-pollination occur in cleistogamous flowers? Give reason for your answer.

What is meant by monosporic development of female gametophyte?

Find the area of the region bounded by the curve y²=4x and the line x=3

Arrange the following terms in the correct developmental sequence: Pollen grain, sporogenous tissue, microspore tetrad, pollen mother cell, male gametes

Find the area bounded by the curve x²=4y and the line x=4y-2

\(∫_0^\frac{2}{3} \frac{dx}{4+9x^2}\) equals

\(∫_1^{\sqrt{3}}\frac{dx}{1+x^2}\)  equals

Evaluate the definite integral: \(∫^{\frac{\pi}{4}}_0 sin2xdx\)

Find the maximum area of an isosceles triangle inscribed in the ellipse \(\frac{x^2}{a^2}+\frac{y^2}{b^2}=1\) with its vertex at one end of the major axis.

 

What is self-incompatibility? Why does self-pollination not lead to seed formation in self-incompatible species?

Differentiate between microsporogenesis and megasporogenesis. Which type of cell division occurs during these events? Name the structures formed at the end of these two events.

Find the intervals in which the function f given by  \(f(x)=x^3+\frac{1}{x^3},x≠0\) is (i)increasing (ii)decreasing

Find the intervals in which the function f given by \(f(x)=\frac{4sinx-2x-x}{2+cosx}\) is (i)increasing (ii)decreasing

Use Lenz’s law to determine the direction of induced current in the situations described by Fig. 6.16:

1. A wire of irregular shape turning into a circular shape
2. A circular loop being deformed into a narrow straight wire