Class 12th Biology 2012 Set2 Delhi Board Paper Solution
Question 5
When do the oogenesis and the spermatogenesis initiate in human females and males respectively?
Answer
Oogenesis is initiated during the embryonic development, spermatogenesis begins at puberty.
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(a) Adaptations of desert plants and animals
(b) Adaptations of plants to water scarcity
(c) Behavioural adaptations in animals
(d) Importance of light to plants
(e) Effect of temperature or water scarcity and the adaptations of animals. - Q:- With a neat diagram explain the 7-celled, 8-nucleate nature of the female gametophyte.
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- Q:- What is triple fusion? Where and how does it take place? Name the nuclei involved in triple fusion.
- Q:- With a neat, labelled diagram, describe the parts of a typical angiosperm ovule.
- Q:- Explain the Law of Dominance using a monohybrid cross.
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5-ATGCATGCATGCATGCATGCATGCATGC-3
Write down the sequence of complementary strand in 5→3 direction - Q:- In which food would you find lactic acid bacteria? Mention some of their useful applications.
- Q:- With a neat, labelled diagram, describe the parts of a typical angiosperm ovule.
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(a) Producers
(b) Primary consumers
(c) Secondary consumers
(d) Decomposers - Q:- Using a Punnett square, work out the distribution of phenotypic features in the first filial generation after a cross between a homozygous female and a heterozygous male for a single locus.
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