(a) State the difference between meiocyte and gamete with respec

Subject

Biology

Class

CBSE Class 12

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 Multiple Choice QuestionsShort Answer Type

11.

Some organisms suspend their metabolic activities to survive in unfavourable conditions. Explain with the help of any four examples.

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12.

(a) State the role of DNA ligase in biotechnology.

(b) What happens when Meloidegyne incognitia consumes cells with RNAi gene?
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13.

Draw a schematic diagram of a part of double stranded dinucleotide DNA chain having all the four nitrogenous bases and showing the correct polarity. 

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14.

Name of parasite the causes filariasis in humans. Mention its two diagnostic symptoms. How is this transmitted to others? 

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15.

Name the source of streptokinase. How does this bioreactor molecule function in our body?

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16.

How do mycorrhizae act as biofertilizers? Explain. Name a genus of fungi that forms a mycorrhizal association with plants.

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17.

(a) State the difference between meiocyte and gamete with respect to chromosome number.

(b) Why is a whiptail lizard referred to as parthenogenetic? 


(a) The gamete contains haploid set of chromosomes while the meiocyte contains a diploid set.

(b) Whiptail lizard is parthenogenetic because in this animal, an unfertilized egg develops into a new individual. This process of reproduction without fertilization is called parthenogenesis.

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18.

Explain the work carried out by Cohen and Boyer that contributed immensely in biotechnology. 

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19.

Where is sporopollenin present in plants? State its significance with reference to its chemical nature. 

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20.

It is established that RNA is the first genetic material. Explain giving three reasons.

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