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CBSE Class 12 Biology Solved Question Paper 2011

Short Answer Type

Name the type of cell division that takes place in the zygote of an organism exhibiting haplontic life cycle.

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2. Write the scientific name of the microbe used for fermenting malted cereals and fruit juices.

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3. Write the unit used for measuring ozone thickness.

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4. Name the event during cell division cycle that results in the gain or loss of chromosome.

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How can bacterial DNA be released from the bacterial cell for biotechnology experiments?

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6. Write the importance of cryopreservation in conservation of biodiversity.

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7. Mention the role of the codons AUG and UGA during protein synthesis.

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8. Normally one embryo develops in one seed but when an orange seed is squeezed many embryos of different shapes and sizes are seen. Mention how it has happened.

In orange seeds the nucellus cells divide and protrudes into the embryo sac to develop into embryos. Hence, each ovule contain several embryos and the condition is called polyembryony. This is why embryos of different shapes and sizes are seen when an orange seed is squeezed.

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