Biology - Online Test
Q1. The TCA cycle starts with
Answer : Option D
Explaination / Solution:
The TCA cycle starts with the condensation of acetyl group with oxaloacetic acid (OAA) and water to yield citric acid.
Q2. DDT is a
Answer : Option C
Explaination / Solution:
DDT is a non-biodegradable pollutant used as pesticides in agricultural field. It pollutes the air, water and soil if used in form of spray.
Q3. One animal that does not perform locomotion is
Answer : Option C
Explaination / Solution:
Sycon does not perform locomotion, although it is a animal. Syconremain attached to substratum and does not move from one place to other.
Q4. In which stage of mitosis, the number and shape of chromosome can be observed?
Answer : Option C
Explaination / Solution:
The metaphase is characterised by all the chromosomes coming to lie at the equator with one chromatid of each chromosome connected by its kinetochore to spindle fibres from one pole and its sister chromatid connected by its kinetochore to spindle fibres from the opposite pole.
Q5. Thermostable DNA polymerase is isolated from bacterium
Answer : Option D
Explaination / Solution:
Taq polymerase is a thermostable DNA polymerase named after the thermophilic bacterium Thermus aquaticus from which it was originally isolated by Chien et al. in 1976.Its name is often abbreviated to Taq Pol or simply Taq. It is frequently used in the polymerase chain reaction (PCR), a method for greatly amplifying the quantity of short segments of DNA. It remain active during high temperature induced denaturation of double stranded DNA.
Q6. During micturition, the muscles of urinary bladder and urethral sphincters will
Answer : Option A
Explaination / Solution:
The CNS passes on motor messages to initiate the contraction of smooth muscles of the bladder and simultaneous relaxation of the urethral sphincter causing the release of urine.
Q7. According to Darwin, evolution is
Answer : Option B
Explaination / Solution:
According to Charles Darwin, evolution is a very slow and gradual process. He believed that evolution took place over a very long period of time. When we talk about time period in evolution we usually refer to billions of years. The generation of a species from another takes a long period of time. It is a very steady process as the changes and adaptation take long time to stabilise and give rise to a new species.
Q8. Main seat of photosynthesis in leaf is
Answer : Option A
Explaination / Solution:
The palisade parenchymatous cell in the mesophyll region has numerous chloroplasts. Hence, it is the main seat of photosynthesis in leaf.
Q9. The highest categories of classification is
Answer : Option C
Explaination / Solution:
The taxonomic hierarchy Kingdom -> Phylum/Division -> Class -> Order -> Family -> Genus -> Species. Hence, the correct option is Kingdom.
Q10. Natural auxins among the following are: a) IAA, b) IBA, c) NAA and d) 2, 4 D
Answer : Option D
Explaination / Solution:
Auxins like IAA and indole butyric acid (IBA) have been isolated from plants.(naturally) NAA (naphthalene acetic acid) and 2, 4-D (2, 4-dichlorophenoxyacetic)are synthetic auxins.
