Why reproduction is important for an organism? “Meiosis is characteristically different from Mitosis” - how would you justify the statement ? [2+3=5]
Here are some reasons why reproduction is important for an organism:
Meiosis is characteristically different from mitosis in the following ways:
Question ID: 609
Uploaded on: October 11, 2024
Describe five processes of asexual reproduction with one suitable example for each.
Here are five processes of asexual reproduction with one suitable example for each:
Question ID: 610
Uploaded on: October 11, 2024
Show the result of hybridization till F2 generation between a pure black (BB) coarse-haired (RR) guinea pig and a pure white (bb) smooth-haired (rr) guinea pig by a checkerboard. State the conclusion one can reach from this hybridization experiment. [3+2=5]
F2 Phenotypes:
The hybridization experiment shows that black color (B) and coarse hair (R) are dominant traits, while white color (b) and smooth hair (r) are recessive traits. The F2 generation exhibits a typical 9:3:3:1 ratio of phenotypes, illustrating Mendel's law of independent assortment.
Question ID: 611
Uploaded on: October 12, 2024
What symptoms are expressed in a child affected with Thalassaemia? What suggestions are given at the time of genetic counselling in such cases? [3+2=5]
Symptoms expressed in a child affected with Thalassae:
Suggestions to be given at the time of genetic counselling in case of Thalassaemia.
Question ID: 612
Uploaded on: October 12, 2024
Describe the brief outline of the chemical origin of life mentioning Millerand Urey’s experiment. OR Describe two major tenets of Lamarck’s evolutionary theory. How does the comparative anatomy of hearts act as proof in favour of evolutionary theory? [3+2=5]
Here is a brief outline of the chemical origin of life mentioning Miller and Urey's experiment:
Here are two major tenets of Lamarck's evolutionary theory:
Question ID: 613
Uploaded on: October 12, 2024
Analyse the role of bacteria at any three steps of the nitrogen cycle. “Luxurious and comfortable lifestyle is one of the major reasons for air pollution” - Support the statement with arguments. [3 + 2 = 5]
Here are the roles of bacteria in three steps of the nitrogen cycle:
Nitrogen fixation: Bacteria are responsible for converting atmospheric nitrogen gas (N2) into forms that plants can use, such as ammonia (NH3). This process is called nitrogen fixation.
Nitrification: Bacteria convert ammonia into nitrites (NO2-) and then into nitrates (NO3-). This process is called nitrification.
Denitrification: Bacteria convert nitrates back into nitrogen gas. This process is called denitrification.
A luxurious and comfortable lifestyle is one of the major reasons for air pollution. This is because many of the activities that we associate with a luxurious and comfortable lifestyle, such as driving cars, using air conditioners, and burning fossil fuels, produce air pollutants.
Question ID: 614
Uploaded on: October 12, 2024
Give two examples of animal biodiversity endangered by the pollution of the river Ganga. Explain any three incidences which occurred as a result of the disruption of the nitrogen cycle.
Two examples of animal biodiversity endangered by the pollution of the river Ganga
Here are three incidences which occurred as a result of the disruption of the nitrogen cycle:
Question ID: 615
Uploaded on: October 12, 2024
“Change of climate and global warming is a problem resulting from the increasing human population” - Summarize what impacts it might exert on the environment. “Children and adults both suffer from different respiratory problems during the winter”- Write two names of such problems and state one symptom of each of them. [3+2=5]
Due to anthropogenic activity, these are pollution, deforestation and other degradation in the environment. These changes in atmospheric conditions, cause natural changes and global warming. Greenhouse gases are increased. Melting of ice and rise of sea level are occurring. Loss of biodiversity, acid rain, heavy rainfall etc. are other impacts on the environment due to changes in climate and global warming resulting from the increasing human population.
(i) Asthma:
Symptoms can include wheezing, shortness of breath, chest tightness, and coughing.
(ii) Bronchitis-
Symptoms include a productive cough (coughing up mucus), wheezing, shortness of breath, and chest pain.
Question ID: 616
Uploaded on: October 12, 2024
You have identified three environmental problems while on research in Sunderbans - Analyse what impacts might exert on biodiversity. Write the location of the Sundaland hotspot and one important species of its biodiversity. [3+2=5]
Disbalance in prey-predator number - The shrinking of mangrove vegetation has resulted in a reduction in the number of herbivores and as a result of which they carni- vores are becoming endangered in this case the number of tigers is going down and moreover they are getting killed. Gradually the ecosystem will be unbalanced.
Destruction of Mangrove plants due to urbanization- Due to urbanization the mangrove plants are destroyed. The destruction of the Mangrove forest and the progressing human settlement has resulted in the loss of habitat for the animals, making them endangered and vulnerable. As a result, they may get extinct in future.
Submergence of Islands Due to rising sea level:-
An increased number of islands are getting submerged due to increasing water levels as a result of which the habitat is getting shrunk and that has reduced the habitat. In want of habitat and food the species of various tropic levels will be lost.
Location of sundaland hotspot:- It is a biogeographical region of South Eastern Asia.
Important species:- Elephant
Question ID: 617
Uploaded on: October 12, 2024