Biology - Online Test
Q1. The number of substrate molecules changed per minute by a molecule of enzyme is called
Answer : Option C
Explaination / Solution:
The number of substrate molecules changed per minute by a molecule of enzyme is called turn over number. Higher the turn over number more effective is the enzyme.
Q2. Which of the following blood components play a major role in blood coagulation ?
Answer : Option A
Explaination / Solution:
Platelets also called thrombocytes are cell fragments produced from megakaryocytes. Platelets can release a variety of substances most of which are involved in the coagulation or clotting of blood.
Q3. The innate tendency of offspring to resemble their parents is called
Answer : Option D
Explaination / Solution:
The innate tendency of offspring to resemble their parents is called heredity. The offspring resembles to parent due to same genetic combination inherited from parents.
Q4. Organism which depend on dead and decaying organic matter is
Answer : Option A
Explaination / Solution:
A saprophyte or saprotroph is an organism which gets its energy from dead and decaying organic matter. This may be decaying pieces of plants or animals.
This means that saprophytes are heterotrophs. They are consumers in the food chain.
Q5. Micro-organisms that grow in milk and convert it to curd is commonly called
Answer : Option A
Explaination / Solution:
The micro-organisms that grow in milk and convert it to curd is commonly called lactic acid bacteria. Micro-organism such as Lactobacillus and others commonly called as lactic acid bacteria (LAB).
Q6.
Air pollution is:
i. 5th leading cause of deaths in Indian sub-continent.
ii. ranked among top 10 killers in the world.
iii. 7th most dangerous killer in south Asia.
Answer : Option A
Explaination / Solution:
Air pollution causes a number of respiratory disease including lung cancer. It is the 5th leading causes of deaths in Indian sub-constinent and 7th most dangerous killer in south Asia.
Q7. Reproduction is an essential life process, which help in
Answer : Option D
Explaination / Solution:
During reproduction, new individuals are produced having similar traits that help in continuity of species. It is essential as all living organisms have fixed life span.
Q8. Monstera has
Answer : Option B
Explaination / Solution:
In some plants, like grass,Monsteraand the banyan tree, roots arisefrom parts of the plant other than theradicle and are called adventitious roots
Q9. Plants show mitotic divisions in -------------
Answer : Option C
Explaination / Solution:
The plants can show mitotic divisions in both haploid and diploid cells due to alternation of generations in life cycle.
Q10. The techniques of using live organisms of enzymes from organism to produce products and processes useful to human is called
Answer : Option A
Explaination / Solution:
Biotechnology is the use of living systems and organisms to develop or make products, or "any technological application that uses biological systems, living organisms, or derivatives thereof, to make or modify products or processes for specific use".
