List of top Questions asked in CBSE CLASS XII- 2026

Which of the following set of states have the lowest percentage of urban population?

The Watershed Management Programme in Jhabua district of Madhya Pradesh was funded by which one of the following ministries?

Match Column I with Column II correctly and choose the most appropriate option:

Which one of the following is not the base of 'international trade'?

Which of the following is a product of forest-based industry?

Which of the following factors are involved in large-scale manufacturing? Choose the most appropriate option. I. Variety of raw material II. Advanced technology III. Semi-skilled worker IV. Large investment

During which one of the following decades, the population growth in India was negative?

Which of the following are the true characteristics of cottage manufacturing? Choose the most appropriate option. I. The artisans use local raw materials. II. The products of these units are supplied at distant markets. III. Most of the times, the family members work in these units. IV. The finished products like mats, bricks, pottery, etc. are some important examples.

Which one of the following types of ports is categorised on the basis of function?

Which of the following is one of the main objectives of 'human development'? Choose the most appropriate option.

Which of the following aspects are true regarding the countries with low level of 'human development'? Choose the most appropriate option. I. These countries are largely facing political turmoil. II. These countries are facing social instability. III. The number of countries in the low level category is the largest. IV. The health status of the people of these countries is poor.

Read the following passage and answer the questions that follow:
India is one of the megadiverse countries housing around 8·1 per cent of global species diversity, although its land area is only 2·4 per cent of the world’s land area. Many of the species are highly threatened due to human activities like deforestation, mining and habitat fragmentation. Laws like Wildlife (Protection) Act, 1972 were enacted by the Government of India to preserve our biological wealth. Various conservation measures are being implemented to save the threatened species. The following bar graph shows the number of species conserved under different biodiversity conservation methods.

Which other methods shown in the diagram are opposite to the one identified by you in question ? How are these two conservation approaches different?
(c) Write two features of Biodiversity hotspots.
(c) To which category do sacred groves belong and how do they help in bio-conservation?

Oogenesis is a discontinuous process that begins before birth and is completed after puberty.
Trace the development of a gamete mother cell till its release from the ovary during ovulation.
Name the two pituitary hormones that play an important role in the process.

Explain any two basic principles/core techniques on which biotechnology is based.
Describe any three key tools used in Recombinant DNA technology.

"Early and accurate diagnosis of diseases is vital in medical technology."
Name the conventional methods of diagnosis and their disadvantages.
Which three diagnostic techniques have been developed through Biotechnology ? Explain how each one helps in detecting diseases.

Work out the crosses between:
Normal female and Haemophilic male
Carrier female and Normal male
(III) Carrier female and Haemophilic male
Write the conclusions you draw from these crosses. Comment on the type of inheritance of the disease.
(Use: $X$ - Normal, $X^h$ - Haemophilic)

Draw a labelled two-celled structure of male gametophyte of an angiosperm.
Name the three layers that surround the cytoplasm of a male gametophyte starting from innermost to outermost layer.
(iii) Which organic material makes the outermost layer? Mention its advantage.
(iv) Why is the outermost layer of male gametophyte not continuous ?

Describe the series of experiments conducted by Frederick Griffith. Comment on the significance of the result obtained.
State the contribution of Avery, MacLeod and McCarty.

In vitro fertilization (IVF) is a popular method these days that is helping childless couples to bear a child.
Write the different steps that are carried out in this technique.
Would you consider gamete intra fallopian transfer as a type of IVF? Justify your answer.

Draw a neat diagram of a maize grain showing the internal structure and label any five parts.

What is meant by translation in protein synthesis?
Explain charging of tRNA (aminoacylation of tRNA) and mention its importance in the process of translation.

Cow dung and water are mixed and fed into a biogas plant to allow digestion of biowastes. The person performing this process says that there is no need to provide an inoculum.
Do you agree with him? Justify your answer.
What happens to the biowaste inside the digester ?
(c) Name the useful by-products obtained from this process and mention how they are used.

What is the carrying capacity of a species in a habitat?
Explain the growth curve that takes this capacity into account.