Human Health and Disease — BIOLOGY STD 12 Science — Question

Mark the odd one the following groups.
Oogonia, Spermatogonia, Zygote, Ootid.

Write a short note on
Effects of temperature or water scarcity and the adaptations of animals

Compare in any three ways the chromosomal theory of inheritance as proposed by Sutton and Bovery with that of experimental results on pea plant presented by Mendel.

Bee keeping practice is a good income generating industry. Write the different points to be kept in mind for successful bee keeping. Write the scientific name of the most common Indian species used for the purpose.

State any three methods by which animals cope with the temporary unfavourable conditions in their habitat when they cannot migrate.

What is aneuploidy? Differentiate between trisomic and triploid condition? Name any one trisomic condition found in human.

Draw a diagram of a male gametophyte of an angiosperm. Label any four parts. Why is sporopollenin considered the most resistant organic material?

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

Name the place in human ovary where the first meiotic division is completed during oogenesis. What are the products of this division? Give the chromosome number of each type of cells involved in the process.

What are 'cloning sites' in a cloning vector? Explain their role. Name any two sites in pBR 322.