Science (English Medium) इयत्ता ११ - CBSE Question Bank Solutions

Mitosis is characterised by ______.

Cells which are not dividing are likely to be at ______.

Between a prokaryote and a eukaryote, which cell has a shorter cell division time?

Which of the phases of cell cycle is of longest duration?

Which tissue of animals and plants exhibits meiosis?

Which part of the human body should one use to demonstrate stages in mitosis?

It is said that the one cycle of cell division in human cells (eukaryotic cells) takes 24 hours. Which phase of the cycle, do you think occupies the maximum part of cell cycle?

Label the diagram and also determine the stage at which this structure is visible.

While examining the mitotic stage in a tissue, one finds some cells with 16 chromosomes and some with 32 chromosomes. What possible reasons could you assign to this difference in chromosome number. Do you think cells with 16 chromosomes could have arisen from cells with 32 chromosomes or vice versa?

Mitosis results in producing two cells which are similar to each other. What would be the consequence if the following irregularities occur during mitosis?

Duplication of DNA does not occur

Two key events take place, during S phase in animal cells, DNA replication and duplication of centriole. In which parts of the cell do events occur?

Comment on the statement – Telophase is reverse of prophase.

Carefully observe the following figure

1. Name the technique shown in the figure and the scientist who demonstrated this technique for the first time.
2. Name atleast three plants for which this technique can be employed for their commercial production.
3. What is the significance of aerating tube and feeding funnel in this setup?

Hydroponics have been shown to be a successful technique for growing of plants. Yet most of the crops are still grown on land. Why?

Which light range is least effective in photosynthesis?

During light reaction in photosynthesis the following are formed ______.

Dark reaction in photosynthesis is called so because ______.

The correct sequence of flow of electrons in the light reaction is ______.

Cyanobacteria and some other photosynthetic bacteria don’t have chloroplasts. How do they conduct photosynthesis?

Does moonlight support photosynthesis?