Question: Do you think microbes can also be used as a source of energy? If yes, how?
Ans: Yes, microbes can serve as a source of energy. Biomass may be used by microbes to produce biofuels like ethanol and biodiesel that can replace fossil fuels.
Point out any three advantages of the tissue culture technique
Ans: 1. Rapid Multiplication: Tissue culture is a method for the quick growth of plants and can quickly multiply thousands of plants.
2. Disease-Free Plants: Tissue culture also aids in the production of disease-free, highly pest- and disease-resistant plants.
3. Quality Control: Tissue culture can be used to control plant quality. It assists in preserving the plants’ intended traits.
Define Allogamy
Ans: Allogamy is the process of fertilization between two individuals with different genetic backgrounds.
Mutualism is a sort of symbiotic connection in which both species gain from their association. The relationship between bees and flowers is an illustration of mutualism. The bees gather nectar from the flowers, which gives them sustenance, while the blooms gain from pollination.
Commensalism is a sort of symbiotic interaction in which one organism gains while the other is unaffected. The interaction between barnacles and whales is an illustration of commensalism. The whales are unaffected as the barnacles adhere to them and eat the food scraps they churn up while swimming.
Question: In a Pisum sativum, the pods may be inflated (I. dominant) or constricted (i. recessive). What proportion of the offspring in the following crosses would be expected to be inflated?
(a) II x ii
(b) li x ii .
(c) II x II
Ans: (A) It would be assumed that all of the offspring would be inflated (100%).
(b) It would be assumed that 50% of the offspring would be inflated.
(c) It would be assumed that all of the offspring would be inflated (100%).
Botany: Solved Previous Year’s Question Paper for NCERT/CBSE Class 12th Botany Read More »
Why a need is felt to conserve biodiversity?
Ans: The preservation of biodiversity is crucial for the survival of our planet and the well-being of our environment, our economy, and ourselves. Clean air, clean water, and a stable climate are all made possible by biodiversity, which is the variety of life that exists within ecosystems. Additionally, it offers us other necessities for our survival, such as food, medication, and other resources. By protecting species and habitats that are necessary for a healthy world and ecosystem, we are guaranteeing that future generations can continue to take advantage of these crucial resources.
What are Biosafety issues?
Ans: The steps taken to assure the safe use, handling, and disposal of biological materials are referred to as biosafety issues. These concerns include the safe handling of genetically modified organisms, the containment of potentially infectious agents in laboratory settings, and adequate biological waste disposal. It also entails safeguarding the environment, lab workers, and other people from potentially dangerous chemicals.
What kind of threats to biodiversity may lead to its loss?
Ans: Threats to biodiversity that can result in its extinction include habitat loss, pollution, invasive species, climate change, over-exploitation, and environmental changes brought on by humans.
1. Habitat Loss: Human activities like urbanisation, deforestation, and agricultural development are serious threats to biodiversity because they destroy and fragment ecosystems.
2. Climate Change: Climate change is affecting species’ life cycles, producing a shift in their ranges, and altering their abundance and distribution.
3. Pollution: Pollution, such as that in the air, water, and ground, can harm or destroy habitats and result in the extinction of species.
4. Invasive Species: These non-native species have the potential to outcompete native species for resources, reducing biodiversity.
5. Overharvesting: Taking too many species for commercial purposes might result in population decreases and put species in jeopardy.
The annual blooming plant Centaurea cyanus also referred to as cornflower or bachelor’s button is a member of the Asteraceae family and is indigenous to Europe. It got its name because it used to frequently grow as a weed in cornfields, where “corn” is used to refer to a variety of cereals, including wheat, barley, rye, and oats. Due to agricultural intensification, notably the excessive use of herbicides, it is now threatened in its natural habitat. Through introduction as a decorative plant in gardens and as a seed contaminant in crop seeds, Centaurea cyanus has now become naturalised in many other regions of the world, including North America and portions of Australia.
Bachelor’s Button (Centaurea cyanus): Introduction, Classification, Description and Uses Read More »
(i) Hydrophilly: Pollination by water is known as hydrophily. The female reproductive organs of plants receive pollen that has been distributed by the water. Water pollination occurs frequently in a wide range of different plant species as well as in aquatic plants like water lilies.
(ii) Entomophilly: Pollination by insects is referred to as entomophily. Pollinators, including bees, butterflies, and other insects, move pollen from one flower to another so that plants can reproduce successfully.
(iii) Anemophilly: The process of pollination by the wind is known as anemophilly. Pollen is distributed in the air and transported to plants’ female reproductive systems. Grass and other wind-pollinated plants frequently undergo this kind of pollination.
Botany: Solved Previous Year Question Paper for NCERT/ CBSE Class 12th Botany Read More »
