Biology - Online Test
Q1. In some lower plants and social insects, the haploid cells are divide by
Answer : Option C
Explaination / Solution:
Mitosis is called equational division. Since the parent cells are haploi so mitosis will lead to restoration of chromosome number in haploid cells.
Q2. In pBr322, B and R stands for
Answer : Option C
Explaination / Solution:
Plasmid vector Pbr322 is a multipurpose cloning vector. In pBr322, B and R stand for Boliver and Rodriguez who discovered this cloning vector.
Q3. Which one of the followings is also called Sewall Wright Effect?
Answer : Option D
Explaination / Solution:
Sewall Wright was the chief developer of the mathematical theory of genetic drift, which is sometimes known as the Sewall Wright effect, cumulative stochastic changes in gene frequencies that arise from random births, deaths, and Mendelian segregations in reproduction.
Q4. Identify from the following, category which has real existence
Answer : Option C
Explaination / Solution:
Kingdom is a category which has real existence. All the living organisms are divided into 5 kingdoms that exist naturally. Phylum, genus, species etc. is thename given to a group of organisms having some common traits.
Q5. Exarch xylem is present in
Answer : Option C
Explaination / Solution:
The xylem in which protoxylemis outside and metaxylem is inside is called exarch xylem. This kind of xylem is found in roots of dicots.
Q6. Which pair of enzyme promotes femaleness in flowers?
Answer : Option D
Explaination / Solution:
Flower Sex Conversions :
- Gibberellins (GA3) promote maleness
- Ethylene and auxins promote femaleness
Q7. We can save those water reservoirs which are useful for irrigation, by
Answer : Option B
Explaination / Solution:
We can save water reservoirs which are useful for irrigation by checking biotic succession. Biotic succession leads to silt formation at bottom that reduce the capacity of water reservoirs.
Q8. Which plant shows valvate aestivation?
Answer : Option B
Explaination / Solution:
When sepals or petals in a whorl just touch one another at the margin, without overlapping, as in Calotropis, it is said to be valvate.
Q9. Radioactive probe can be detected by
Answer : Option A
Explaination / Solution:
Radioactive probes are single stranded DNA or RNA having radioactive components. This probe can be detected in the individual by using autoradiography technique.
Q10. Medical termination of pregnancy is considered safe up to _________ of pregnancy.
Answer : Option A
Explaination / Solution:
Medical termination of pregnancy is considered safe up to twelve weeks or three months. At the end of three months all organs of foetus are formed. It is fetal to mother in case of MTP after three months.
