Biology - Online Test
Q1. Egg released by the Graafian follicle is surrounded by
Answer : Option A
Explaination / Solution:
One of the two ovary release one egg by the Graafian follicle. The egg released is surrounded by two layers called zonapellucida and Vitelline membrane as protective layer.
Q2. Floods can be checked by
Answer : Option B
Explaination / Solution:
Floods can be checked by reforestation. The roots of plants binds the soil and act as barrier in flow of flood water to reduce its current speed.
Q3. An alkaloid widely used in plant breeding for doubling the chromosome number also known as ‘mitotic poison’ is
Answer : Option C
Explaination / Solution:
Colchicine is an alkaloid used in plant breeding for doubling of chromosomes by inhibiting cytokinesis. It is also called as mitotic poison. It is extracted from the bark of plant belonging to genus Colchicum.
Q4. Which one of the followings is incorrect about genetic drift?
Answer : Option B
Explaination / Solution:
Genetic drift is significant only in small population. Larger population has more variation and more species. Loss of some member of that species does not reduce variation essential for evolution.
Q5. Which serve as quick referral systems in taxonomical studies?
Answer : Option A
Explaination / Solution:
Museums have collections of preserved plant and animal specimens for study and reference. Manuals are useful in providing information for identification of names of species found in an area. Monographs contain information on any one taxon. Hence, the correct option is Herbarium.
Q6. A vasectomy prevents the
Answer : Option D
Explaination / Solution:
Vasectomy is the surgical method of birth control in which vas deference of male is cut and tide to prevent release of sperm into vagina during coitus.
Q7. The primary control of gene expression takes place at the level of
Answer : Option D
Explaination / Solution:
Expression of gene starts with transcription of particular segment of DNA, so primary control of gene expression takes place at the level of transcription of DNA into m-RNA.
Q8. The number of autosomes in human primary spermatocyte is
Answer : Option A
Explaination / Solution:
Primary spermatocytes are diploid and contain 23 pairs (46) of chromosomes. These chromosomes are divided into autosomes and sex chromosome. Sex chromosomes are XY and remaining chromosomes are called autosomes.
Q9. Chipko movement originated in
Answer : Option D
Explaination / Solution:
Chipko movement originated in Terhi Garwal of Utter Pradesh to protect the forest form contractors. In this movement women of village hug the tree to prevent it from cutting.
Q10. Material used for study of mitotic cell division in class room is
Answer : Option A
Explaination / Solution:
The most common material used for study of mitosis cell division in class room is onion root and broad bean root tip. They can be grown quickly and in all seasons. Also they are esier to handle with and divisional stages are completed quickly.
