Question
Explain the mechanism of evolution.
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In 1952, Alfred Hershey and Martha Chase took an effort to find the genetic material in organisms. Their experiments led to an unequivocal proof to DNA as genetic material.
Answer the following questions based on Hershey and Chases's experiments:
i. Name the kind of virus they worked with and why?
ii. Why did they use two types of culture media to grow viruses in? Explain.
iii. What was the need for using a blender and later a centrifuge during their experiments? OR
iv. State the conclusion drawn by them after the experiments.
Answer the following questions based on Hershey and Chases's experiments:
i. Name the kind of virus they worked with and why?
ii. Why did they use two types of culture media to grow viruses in? Explain.
iii. What was the need for using a blender and later a centrifuge during their experiments? OR
iv. State the conclusion drawn by them after the experiments.
What is ecological pyramid? Describe the different types of pyramid.
Describe the consumptive use value of biodiversity as food, drugs and medicines, fuel and fiber with suitable examples.
In a plant tallness is dominant over dwarfness and red flower is dominant over white. Starting with the parents work out a dihybrid cross. What is standard dihybrid ratio? Do you think the values would deviate if the two genes in question are interacting with each other?
(a) Draw a sectional view of human ovary and label primary follicle, tertiary follicle, Graafian follicle and corpus luteum in it.
(b) Name the gonadotropins and explain their role in oogenesis and release of ova.
(b) Name the gonadotropins and explain their role in oogenesis and release of ova.
What is innate immunity? How is it accomplished in a human body?
a. Where is microsporangium located in an angiosperm? State the functions of tapetum and the other three layers of microsporangium.
b. Describe the structure of the male gametophyte produced as a result of microsporogenesis.
c. State the functions of each part of the male gametophyte.
b. Describe the structure of the male gametophyte produced as a result of microsporogenesis.
c. State the functions of each part of the male gametophyte.
Human female is not fertile after menopause whereas males can produce gametes at any age after puberty. Analyse the statement and schematically represent a comparison between gametogenesis in males and females.
Study the schematic representation of the genes involved in the lac operon given below and answer the questions that follow.
- Identify and name the regulatory gene in this operon. Explain its role in 'switching off the operon.
- Why is lac operon's regulation referred to as negative regulation?
- Name the inducer molecule and the products of the genes 'z' and 'y of the operon. Write the function of these gene products.
Study the illustration given and answer the questions that follow:
