Zoology - Online Test
Q1. The extinct human who lived 1,00,000 to 40,000 years ago, in Europe, Asia and parts of Africa, with short stature, heavy eye brows, retreating foreheads, large jaws with heavy teeth, stocky bodies, a lumbering gait and stooped posture was
Answer : Option C
Explaination / Solution:
Neanderthals are recognisably human but have distinctive facial features and a stocky build that were evolutionary adaptations to cold, dry environments.
This species lived between 28,000 and 300,000 years ago.
Key physical features :
- Body size and shape: Neanderthals were generally shorter and had more robust skeletons and muscular bodies than modern humans.
- Brain size was larger than the average modern human brain and averaged 1500 cubic centimetres.
- Skull : distinctive skull shape that was long and low, with a rounded brain case. mid-face region showed a characteristic forward projection (this resulted in a face that looked like it had been ‘pulled’ forward by the nose). orbits (eye sockets) were large and rounded. Nose was broad and very large
- Jaws and teeth : jaws were larger and more robust than those of modern humans and had a gap called the retromolar space, behind the third molars (wisdom teeth) at the back of the jaw. jaw lacked the projecting bony chin that is found in Homo sapiens. teeth were larger than those of modern humans.
Q2. Depending on base composition, length of segment and number of repetitive units, the satellite DNA is classified into many categories such as
Answer : Option A
Explaination / Solution:
Satellite DNA contains short nucleotide sequences repeated thousands of time tandemly. Satellite DNA is divided into different categories according to their size i.e., micro-satellites, mini-satellites etc.
- Micro-satellite consists of 2 – 6 bp repeats.
- Mini-satellite consists of 10 – 100 bp repeats, they are referred as VNTRs.
These sequences generally do not code for any protein.
Q3. Mitotic division in zygote as it moves through the isthmus of oviduct is called
Answer : Option A
Explaination / Solution:
Zygote undergoes mitotic division as it moves through the isthmus of oviduct by cleavage to form 2, 4,8,16 blastomeres.
Q4. The difference between Homo sapiens and the Homo erectus was
Answer : Option B
Explaination / Solution:
Home sapiens and Homo erectus in differ in their size of brain capacity. The size of brain of Homo erectus was smaller than Homo sapiens.
The average brain size of Homo erectus is estimated to have been roughly 900 cubic centimeters whereas the average brain size capof Homo sapiens is roughly 1300 cubic centimeters.
Q5. DNA fingerprinting is the basis of paternity testing in case of dispute because
Answer : Option D
Explaination / Solution:
Polymorphism is variation at genetic level which occurs due to mutation. Polymorphisms are inheritable from parent to children without any changes so DNA fingerprinting is the basis of paternity testing.
Q6. Finger-like projections appear on the trophoblast after implantation is called
Answer : Option C
Explaination / Solution:
After implantation of blastocysts, finger-like projections appear on the trophoblast called chronic villi which is surrounded by the uterine tissue and maternal blood.
Q7. The first human-like creature being the hominid was called
Answer : Option A
Explaination / Solution:
The first human like creature being hominid was called Homo habilis. Their brain capacity were about 650-800cc and probably do not eat meat.
Louis Leakey, the British-Kenyan paleoanthropologist who was the first to suggest the existence of H. habilis, and his wife, Mary Leakey, found the first trace of H. habilis in 1955: two hominin teeth.
Q8. The sensitivity of fingerprinting technique has been increased by use of
Answer : Option C
Explaination / Solution:
The sensitivity of fingerprinting technique has been increased by use of Polymerase chain reaction (PCR). After that single cell obtained from organism is enough for this technique.
Q9. Inner cell mass (embryo) contain certain cells that contain cells called stem cells which have potency to
Answer : Option A
Explaination / Solution:
The inner cell mass contain certain cells that contain cells called stem cells which have potency to give rise all the tissues and organs. Now a day’s stem cells are preserved for future use.
Q10. Which of the following sentences is true about the evolutionary process?
Answer : Option A
Explaination / Solution:
Evolutionary process is totally different from human progress.
Evolution leads to creation of complex organism. It does not lead to creation of better organism. For e.g, we are not better than the amoeba, we are just complex than amoeba.
There is no real progress in the idea of evolution which is biologically controlled to creation of variation.
