Zoology - Online Test
Q1. Transgenic mice are being developed for use in testing the safety of
Answer : Option C
Explaination / Solution:
Transgenic mice are being developed for use in testing the safety of vaccines before they are used on humans. Transgenic mice are being used to test the safety of the polio vaccine. If successful and found to be reliable, they could replace the use of monkeys to test the safety of batches of the vaccine.
Q2. Which one out of following is not a consequence of overpopulation
Answer : Option C
Explaination / Solution:
The consequence of overpopulation includes unemployment, price rise, and energy crisis. Hygienic condition is not directly affected by overpopulation.
Q3. Which of the following structure is Ectodermal in origin?
Answer : Option D
Explaination / Solution:
The ectoderm differentiates to form the nervous system (spine, peripheral nerves and brain), tooth enamel and the epidermis, the outer part of integument. It also forms the lining of mouth, anus, nostrils, sweat glands, hair and nails.
Q4. The organism that completely lack a cell wall and are smallest living cell known that can survive without oxygen is
Answer : Option A
Explaination / Solution:
Mycoplasma is a genus of bacteria that lack a cell wall around their cell membrane. Without a cell wall, they are unaffected by many common antibiotics such as penicillin or other beta-lactam antibiotics that target cell wall synthesis.
Mycoplasma species are the smallest bacterial cells yet discovered,can survive without oxygen, and come in various shapes. For example, M. genitalium is flask-shaped.
Q5. The term Darwinian fitness among populations living together signifies
Answer : Option A
Explaination / Solution:
The term Darwinian fitness among populations living together signifies the reproductive fitness of organisms population. Those species that can reproduce in between are called reproductive fitness.
Q6. Correct sequence of layers in gut wall from inside to outside is :
Answer : Option B
Explaination / Solution:
Serosa is the outermost layer while mucosa is the innermost layer. The layer next to mucosa is the sub-mucosa containing nerves, blood and lymph vessels. Muscularisis found between sub-mucosa and serosa.
Q7. A metastatic cancerous tissue is termed ‘sarcoma’ if the disorder is in
Answer : Option B
Explaination / Solution:
A metastatic cancerous tissue is called sarcoma if the disorder is in fibroblast. The property of cancerous cells to reach from one part of the body to other through blood is called metastasis.
Q8.
Among photoreceptors cones are responsible for bright light vision and they also :
i. give colour vision because they contain 3 different pigments.
ii. pigments are sensitive to red,green and yellow lights.
iii. pigments are sensitive to red,green and blue lights.
iv. individual cone cell contains all the three pigments in it.
Answer : Option D
Explaination / Solution:
In the human eye, there are three types of cones which possess their own characteristic photopigments that respond to red, green and blue lights. The sensations of different coloursare produced by various combinations of these cones and their photopigments.
Q9. The vacuoles are bound by the single membrane is called as
Answer : Option A
Explaination / Solution:
The vacuole is bound by a single membrane called tonoplast. In plant cells the vacuoles can occupy up to 90 per cent of the volume of the cell. In plants, the tonoplast facilitates the transport of a number of ions.
Q10. Okazaki is known for his contribution to the understanding of
Answer : Option C
Explaination / Solution:
Reiji Okazaki (October 8, 1930 – August 1, 1975) was a pioneer Japanese molecular biologist, known for his research on DNA replication and especially for describing the role of Okazaki fragments along with his wife Tsuneko.
He proposed the concept of semi-conservative nature of replication of DNA molecules.
