Biology - Online Test
Q1. The cultivation of a single cash crop in plantations or estates (large areas of land) on a large scale(in the whole year)is called plantational farming and example is/are
Answer : Option B
Explaination / Solution:
Plantation agriculture is a form of commercial farming where crops are grown for sale. Some crops are sold as raw materials to manufacturing industries or partially processed and value added before selling the products to large companies for further processing. Example of plantational farming is rubber plantation, tea plantation etc.
Q2.
Arrange the order of events taking place in anaphase II stage of meiosis:
a. Metaphase plate spilts
b. Each chromosome moves away from equatorial plane
c. Centromeres split and chromatids separate.
d. Chromatids move to opposite poles
Answer : Option B
Explaination / Solution:
During anaphase stage, metaphase plate splits and each chromosome moves away from equatorial plane splitting the centromere and separate chromatids which move to opposite poles.
Q3. EtbR fluoresces in UV light because
Answer : Option A
Explaination / Solution:
Ethidium bromide is a molecule commonly used to visualize DNA in agarose gel electrophoresis experiments. It both binds to DNA and fluoresces under the proper conditions. Ethidium bromide is known as an intercalating agent. The flat structure of ethidium bromide allows it to intercalate, or insert, between nitrogenous bases of a DNA molecule. This interaction is especially useful because of ethidium bromide's second characteristic. When it is exposed to ultraviolet light, ethidium bromide fluoresces. Thus, this chemical provides both a means of tagging DNA molecules and a means of visualizing them.
Q4. Diabetes insipidus is caused due to :
Answer : Option D
Explaination / Solution:
Diabetes insipidus is rate variety of diabetes characterized by excessive thrust and excretion of large amount of urine. It is caused due to reduced secretion of antidiuretic hormone (ADH) or vasopressin hormone.
Q5. Big bang theory try to explain
Answer : Option A
Explaination / Solution:
The Big Bang is a scientific theory about how the universe started, and then made the stars and galaxies we see today.
It tries to explain the origin of universe. It told us about the singular large explosion unimaginable in physical term.
Q6. The Aleurone layer of Maize grain is especially rich in
Answer : Option C
Explaination / Solution:
Aleurone layer of maize grain is rich in proteins. It is the outermost layer of the endosperm followed by the inner starchy endosperm.
Q7. Quiescent centre is found in the plant at
Answer : Option C
Explaination / Solution:
Quiescent centre is a small group of cells with low mitotic activity. It is found at the tips of growing roots in the root meristem.
Q8. Identify the correct binomial nomenclature of Mango
Answer : Option C
Explaination / Solution:
Biological name of an organism consists of genus name and species name. the correct biological nomenclature of Mango is Mangiferindica Linn.
Q9. Parthenocarpy can be induced to develop seedless fruit by application of
Answer : Option A
Explaination / Solution:
Auxins (IAA,IBA)also induce parthenocarpy,(Seed less fruits) e.g., in tomatoes.
Q10. Asexual reproduction is common in
Answer : Option B
Explaination / Solution:
Asexual reproduction is common in Protists and Monera. Both these kinds include organisms having single celled body. Binary and multiple fissions are generally followed for asexual mode of reproduction.
