The correct answer is c. Energy is never recycled in an ecosystem. It is created when decomposers decompose organic matter. Note that you can…
There are various types of oils released from oil spills. Microbes can biodegrade only a small fraction of this. The rest of it remains…
Bacterial and fungal degradation come under microbial degradation or biodegradation. Plastic should be treated before subjecting to biodegradation. It should be broken down into…
We should minimize our carbon consumption, if not for our future generations, then for ourselves. The greenhouse effect is leading to rising in earth’s…
Key functions and sub-disciplines within the field of toxicology. Toxicology comes from two Greek words, ‘Toxicos’ means poisonous and “logos” means to study. So,…
Landfill gas is a mixture of many gases. It is produced by action of micro-organisms in a landfill. Three actions occur in a landfill:…
NITROGEN CYCLE Nitrogen cycle includes the process of uptake of nitrogen from the environment, its usage by various plants, and returning it back to…
QUESTION NO. ANSWER 1. …
SECTION A: (2 MARKS EACH) Q1. If a 4 digit year (e.g. 1927) is chosen randomly, what is the probability that it is not…
Q2. Find the missing number in the sequence 61, 52, 63, 94, _____, 18, 001, 121 A. 46 B. 70 C. 66 D. 44…
SECTION B (2 MARKS EACH) Q3. The most ancient mode of energy generating metabolic reactions are: A. Photosynthesis B. Oxidation of nitrate C. Reduction…
Q4. Location of Glutamate synthatase, an important enzyme in nitrogen assimilation is A. only cytoplasm B. only chloroplast C. both cytoplasm and chloroplast D….
SECTION C (4 MARKS EACH) Q6. The following are certain facts regarding biological nitrogen fixation in plants: 1. Oxygen irreversibly inactivates nitrogenase enzyme involved…
Q5. Symbiotic biological nitrogen fixation takes place with the association between a plant and a nitrogen fixing prokaryote as shown in the following table:…
Q7. Match the following associations involved in dinitrogen fixation with their representative genera: Associations …
Q8. The nodulation (nod) genes are classified as common nod genes or host specific nod genes. Some statements related to such classification are given…
Q9. In the global nitrogen cycle, the following microbial organisms are involved in three important process- denitrification, nitrification and nitrogen fixation. a) Rhizobium …
Q10. Nitrogen fixation is basically a process of converting nitrogen gas into ammonia (NH3). One of the key enzymes in the process is “nitrogenase”….
The correct answer is b) Arunachal pradesh. Explanation: Delhi is not a state. Although among cities maximum dengue cases in 2015 occurred her (i.e….
Meghalaya. Balphakram National Park is near the Garo Hills in Meghalaya; it is also close to the boundary of Bangladesh.
a) need or want (is the correct answer). Please note that hybridisation, crossover and mutations all result in mixing of gene components leading to…
The disease which is spread from person to person is known as infectious disease. In this regard, an example of Ebola virus outbreak can…