Biology - Online Test
Q1. Plasmid used to produce humulin is
Answer : Option B
Explaination / Solution:
Plasmid are extra nuclear genetic materials present in bacterial humulin is produced by using plasmid Pbr322. It is an E.coli plasmid vector containing the origin of replication.
Q2. Cutting and tiding of fallopian tube to avoid pregnancy is called
Answer : Option C
Explaination / Solution:
Cutting and tiding of fallopian tube to avoid pregnancy is called tubectomy. It is a surgical method of contraception. This method is used only when no more child is required in future. It can be done only in female.
Q3. The matrix of bone and cartilage can be distinguished by the presence of
Answer : Option D
Explaination / Solution:
The matrix of bone and cartilage differ by the presence of haversian canal that makes bone hard and stiff. On the other hand, cartilage are flexible.
Q4. The genetic material of virus is
Answer : Option C
Explaination / Solution:
Most viruses have either RNA or DNA as their genetic material. The nucleic acid may be single- or double-stranded.
The entire infectious virus particle, called a virion, consists of the nucleic acid and an outer shell of protein.
Q5. Symplastic movement is aided by
Answer : Option B
Explaination / Solution:
Symplastic movement may be aided by cytoplasmic streaming. We can observed cytoplasmic streaming in cells of the Hydrilla leaf.
Q6. Cultivation of hybrids has increased productivity although it is not used extensively
Answer : Option D
Explaination / Solution:
Hybrid seeds are produced to increase the productivity, resistivity and nutritional value of seed and fruit. It is not used extensively as hybrid seeds have to be produced every year so it becomes costly to farmers.
Q7. Temperature is an environmental factor that does not affect
Answer : Option C
Explaination / Solution:
Temperature is an environmental factor that influence the type and number of species in a given habitat. Temperature may change the enzyme kinetics, physiology and geographical distribution of species. Photoperiod is the duration of light that fall on plant and not affected by temperature.
Q8. In legumes, rhizobium bacteria are found in
Answer : Option D
Explaination / Solution:
Nitrogen-fixing bacteria, especially roots of legumes, can fix this atmospheric nitrogen into biologically usable forms.
Q9. The reflex action of vomiting is controlled by
Answer : Option A
Explaination / Solution:
Vomiting is believed to be controlled by two distinct brain centres—the vomiting centre and the chemoreceptor trigger zone—both located in the medulla oblongata.
The vomiting centre initiates and controls the act of emesis, which involves a series of contractions of the smooth muscles lining the digestive tract.
Q10. Which of the following organism produce gemmules as asexual reproductive structure?
Answer : Option B
Explaination / Solution:
Gemmules are asexual reproductive structure produced by sponges. Chlamydomonas produce zoospores, hydra produce buds and Penicillium produces conidia.
