Lac operon is considered to be regulated by its substrate. Explain. |
Or |
Inheritance is particulate in nature. Why? |
(i) What is the reason for such an arrangement? Also differentiate between the two types of wastes. |
(ii) Which values have been shown by Neeta? |
Technology | Procedure |
IVF and ET | A |
B | Introduction of zygote (with 8 blastomeres) into Fallopian tube |
C | Introduction of ova of a donor into Fallopian tube |
(i) Being a responsible citizen, how would you explain them the importance of vaccination. |
(ii) How can this idea be made reachable to them? |
(i) What is morula in humans? |
(ii) It transforms into which structure and by which process? |
What do you understand by the following terms |
(i) Vegetative propagation |
(ii) Embryogenesis |
Or |
(i) Anemophily is a highly wasteful process. Justify the statement. |
(ii) Apomixis commonly mimics sexual reproduction. Comment. |
(i) DNA always moves towards anode during gel - electrophoresis. |
(ii) For isolating the genetic material from a fungal cell chitinase enzyme is used. |
(iii) Restriction enzymes are called chemical scalpels. |
(i) How would you justify that, despite these differences, they all belong to the same species? |
(ii) Give reasons for the differences in the fur colour of squirrel. |
(iii) What value of nature is indicated by such differences? |
(i) Identify A and mention its importance. |
(ii) Which changes occur in ovum during this stage? |
How are morphological and physiological characters of plants are associated with the resistance to insect pests? Provide five examples, describing features and the name of insect pests to which each plant is resistant. |
Or |
Breeding of animals is mainly done to increase the possibility of obtaining the offspring of desired traits. Discuss the ways being employed to achieve a successful animal breeding. According to you, which is the best method among these discussed methods and why? |
The term 'biodiversity' is used to describe the diversity at all levels of biological organisation ranging from macromolecules inside the cells to biomes. What are the three inter - related hierarchial levels of diversity? |
Or |
(i) Draw an ideal pyramid of energy upto four trophic levels where 1,000,000 J energy is available (from sunlight) to the primary producers. Indicate the amount of energy available at each trophic level. |
(ii) State the relation between gross and net primary productivity. |
(iii) State what standing state of a trophic level represents. |
A true breeding pea plant homozygous for axial violet flowers (AAW) was crossed with another pea plant having terminal white flowers (aavv). |
(i) Predict the phenotype and genotype of \[{{F}_{1}}\]- generation. |
(ii) Find out the phenotypic ratio of \[{{F}_{2}}\] - generation. |
(iii) Discuss the Mendel's generalisation that can be derived from the above cross. |
Or |
(i) What are variations? |
(ii) How is genetic drift important in evolution? |
(iii) Fitness of a population helps in evolution. Give reason. |
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