Biology - Online Test
Q1. Largest bird is
Answer : Option C
Explaination / Solution:
Ostrich is a large sized bird. It is not able to fly long distance. The egg of ostrich is considered largest cell which is about one meter in diameter.
Q2. Rhizophora possess
Answer : Option B
Explaination / Solution:
An aerial root that arises form a stem or trunk, penetrates the soil and help supports the plant. Prop root is found in Rhizophora plant.
Q3. In yeast the cell cycle is progressed through
Answer : Option D
Explaination / Solution:
Yeast can progress through the cell cycle in only about 90 minutes due to its simple organisation.
Q4. Brief exposure of cells to an electric field also allow the bacteria to take up DNA and this process is called as
Answer : Option B
Explaination / Solution:
Electroporation, or electropermeabilization, is a microbiology technique in which an electrical field is applied to cells in order to increase the permeability of the cell membrane, allowing chemicals, drugs, or DNA to be introduced into the cell.
Q5. Urinary bladder is absent in :
Answer : Option D
Explaination / Solution:
Urinary bladder is absent in snake and bird because the urine of these is semi-solid consisting mainly of uric acid. The primary function of urinary bladder is to store urine in mammals. The urinary bladder cannot store semi-solid urine.
Q6. Fossils are most commonly preserved in
Answer : Option B
Explaination / Solution:
Fossils are dead remains of plants and animals buried inside the earth crust millions of year ago. Fossils are commonly preserved in sedimentary rock as this kinds of rocks are formed layer by layer in course of time.
Q7. The parenchymatous cells which lie between the xylem and the phloem are called
Answer : Option B
Explaination / Solution:
Conjunctive tissue is a narrow strip of tissue ( parenchyma or sclerenchyma) that lies between xylem and phloem bundles of root.
Q8. The correct sequence leading to the growth curve
Answer : Option B
Explaination / Solution:
The initial growth is slow (lag phase), and it increases rapidly thereafter – at an exponential rate (log or exponential phase). Here, both the progeny cells following mitotic cell division retain the ability to divide and continue to do so. However, with limited nutrient supply, the growth slows down leading to a stationary phase.
Q9. A binomial nomenclature has _________________ words.
Answer : Option D
Explaination / Solution:
The first word in a biological name represents the genus while the second component denotes the specific epithet. Hence, the correct option is Two.
Q10. Discovery of actin is credited to
Answer : Option D
Explaination / Solution:
Actin and myosin filaments are responsible for contraction and relaxation of muscle. The discovery of actin is credited to Straub.
