Give the scientific name of the bacteria widely used in biotechnology to create a GM cotton crop resistant to bollworm attacks.
Show Hint
Bacillus thuringiensis is commonly used in agriculture to naturally manage pest populations.
Solution and Explanation
Bacillus thuringiensis (Bt).
Top Questions on Wastewater
- Draw a schematic diagram of an antibody molecule and label any 4 parts. Mention their chemical nature. Name the cells which produce them.
- A water treatment plant treats 25 MLD water with a natural alkalinity of 4.0 mg/L (as CaCO3). It is estimated that, during coagulation of this water, 450 kg/day of calcium bicarbonate (Ca(HCO3)2) is required based on the alum dosage.
Consider the atomic weights as: Ca-40, H-1, C-12, O-16.
The quantity of pure quick lime, CaO (in kg) required for this process per day is _____ (rounded off to 2 decimal places). - Activated carbon is used to remove a pollutant from wastewater in a mixed batch reactor, which follows first-order reaction kinetics.
At a reaction rate of 0.38 /day, the time (in days) required to remove the pollutant by 95% is ______ (rounded off to 1 decimal place). - One million liters per day (MLD) of wastewater with a soluble BOD of 200 mg/L is treated in an activated sludge process. The BOD of treated wastewater is 20 mg/L. The observed yield coefficient of the biological system is 0.35.
The daily biomass generation in the system is _____________kg (an integer value). - An industry discharges 2 million liters per day (MLD) of wastewater with a temperature of 45°C and a pH of 2, whereas the neighboring industry produces 3 MLD of wastewater with a temperature of 30°C and pH of 8. If both the wastewaters are mixed and carried through a pipeline, then the resultant pH of mixed wastewater is ___________ (rounded off to 2 decimal places).
Neglect buffering capacity of the system and the temperature effect on pH.
Questions Asked in CBSE CLASS XII exam
- Write the symptoms of malaria in human and explain what causes these symptoms.
- CBSE CLASS XII - 2024
- Environment
- Describe the different steps in the sexual mode of reproduction in the life cycle of a malarial parasite from the time of its initiation till where it is completed and ready to start a fresh cycle.
- CBSE CLASS XII - 2024
- Human Development
Read the following characteristics of retail trading carefully and choose the correct option:
I. This is concerned with the sale of goods directly to the consumers.
II. Most of the retail trading takes place in fixed establishments or stores.
III. It is formed by many middlemen, traders, and suppliers.
IV. Hawkers, street peddling, automatic vending machines, etc., are its examples.
- CBSE CLASS XII - 2024
- The Earth: Our Habitat
Read the programmes related to the proposed Bharatmala umbrella scheme carefully and choose the correct option:
I. Backward areas, religious and tourist places connectivity programme
2. To interconnect the four metropolitan cities of the country
3. To develop State roads in adjoining coastal areas
4. To connect non-major ports in coastal states
- CBSE CLASS XII - 2024
- Motions of the Earth
- If any land remains uncultivated for more than five years, then it falls in which of the following categories?