Biology - Online Test
Q1. Which of the following represents an incorrect feature of ecological succession:
Answer : Option A
Explaination / Solution:
Ecological succession gradually results into gradual increase in the biomass as new species having complex plant body replace the older species. Thus, the biomass increase at each stage of succession.
Q2. Read the following :
i. The synovial joints ischaracterised by the presence of a fluid filled synovial cavity between the articulating surfaces of the two bones.
ii. Saddle is a type of synovial joint
i. The synovial joints ischaracterised by the presence of a fluid filled synovial cavity between the articulating surfaces of the two bones.
ii. Saddle is a type of synovial joint
Answer : Option A
Explaination / Solution:
Synovial joints are characterised by the presence of a fluid filled synovial cavity between the articulating surfaces of the two bones.
A saddle joint is a synovial joint where one of the bones forming the joint is shaped like a saddle with the other bone resting on it like a rider on a horse. Saddle joint (between carpal and metacarpal of thumb)
Q3. Biopiracy is
Answer : Option A
Explaination / Solution:
Biopiracy describes a practice in which indigenous knowledge of nature, originating with indigenous peoples, is used by others for profit, without permission from and with little or no compensation or recognition to the indigenous people themselves.
Q4. Which of the following methods of contraception protect the individual from sexually transmitted disease as well as unwanted pregnancy?
Answer : Option D
Explaination / Solution:
Condom prevents the individual from both unwanted pregnancy as well as sexually transmitted diseases because it prevents the transfer of body fluid between two partners.
Q5. The life span of RBC and WBC are respectively
Answer : Option D
Explaination / Solution:
Red blood cells (RBC) live for 120 days and white blood cells (WBC) live for 90 days. Afterwards they are degraded in spleen.
Q6. Which one is important in nutrient recycle and act as decomposer and mineralisers of the biosphere
Answer : Option A
Explaination / Solution:
Fungi is important in nutrient cycle and acts as decomposer along with bacteria and mininerlisers of the biosphere to regular recycling of nutrients in the biosphere.
Q7. Cohesion-tension theory is related to
Answer : Option D
Explaination / Solution:
The process of movement of water and minerals from roots to leaves in plant through xylem tissues is called ascent of sap. The most accepted theory of ascent of sap is cohesion-tension theory.
Q8. Filiform apparatus present in egg synergids of female gametophyte pay important role of
Answer : Option A
Explaination / Solution:
The synergids have special cellular thickening at micropylar tips called filiform apparatus which help in guiding pollen tube into egg synergids for fertilisation to form embryo.
Q9. Which of the following could be most intense and strongest?
Answer : Option C
Explaination / Solution:
Intraspecific competition could be most intense and strongest as it occurs between organisms having same types of requirement of food, water etc. They may have competition for food, shelter, water, space or mat also.
Q10. Minerals present in the soil are absorbed by
Answer : Option D
Explaination / Solution:
Most of the minerals present in soil can enter plants through roots.
