Biology - Online Test
Q1.
If is the final size, is initial size, r is growth rate and t is time of growth than Exponential growth is represented by
Answer : Option A
Explaination / Solution:
Exponential growth is represented by initial size and growth rate and time. If is the final size, is the initial size, r is growth rate and t is the time of growth than exponential growth is
Q2. Example of interspecific hybrid is
Answer : Option C
Explaination / Solution:
Tigon and liger are produced by hybridization of tow interspecific species. Although hybridization generally takes place between same species.
Q3. Which plant can propagated Vegetatively by leaf
Answer : Option A
Explaination / Solution:
Bryophyllum plants grow in marshy areas where seeds are not able to germinate. The leaf margin of Bryophyllum contains numerous plantlets before falling on muddy land.
Q4. Which of the following ecosystem services cost maximum
Answer : Option A
Explaination / Solution:
Soil formation accounts for about 50% of total cost of ecosystem services. Nutrient cycling and recreation accounts for about 10% of all ecosystem services.
Q5.
Match the following :
Animal
a) Sphyrna
b) Pediculus
c) Asterias
d) Metridium
type of skeleton
i) exoskeleton
ii) hydrostatic skeleton
iii) cartilaginous skeleton
iv) endoskeleton
Answer : Option A
Explaination / Solution:
Different kinds of skeleton system is found in different organisms. Sphyma contain cartilaginous skeleton. Pediculus contain exoskeleton. Asterias contain endoskeleton and Metridium contains hydrostatic skeleton.
Q6. 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.
Q7. 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.
Q8. otal water content presenTt in the soil is called
Answer : Option B
Explaination / Solution:
Total water content present in the soil is called holard. Out of this, the water which can be absorbed by the plant is called chresard and remaining is called echard.
Q9. 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.
Q10. 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.
