CBSE 11TH BIOLOGY - Online Test
Q1. When the coelomic fluid serves as a skeleton it is known as
Answer : Option B
Explaination / Solution:
Coelomic fluids serves as a skeleton in some insects called as hydrostatic skeleton that help in maintaining shape and size of the body of organisms in absence of bone or cartilage.
Q2. The oils have
Answer : Option C
Explaination / Solution:
Oils have lower melting point (e.g., gingely oil) and hence remain as oil in winters.
Q3. Energy is stored in the form of
Answer : Option C
Explaination / Solution:
Cells store energy in a molecule called adenosine triphosphate (abbreviated as ATP). The adenosine molecule has three phosphate groups attached to it (triphosphate means three phosphates) which are held together by high energy bonds.
If one of these bonds is broken, a great amount of energy is released which can be used in an endergonic reaction.
Q4. The specialised patch of modified heart muscles from where contraction initiates, is/are :
Answer : Option C
Explaination / Solution:
The nodal musculature has the ability to generate action potentials without any external stimuli. The number of action potentials that could be generated in a minute vary at different parts of the nodal system. The SAN can generate the maximum number of action potentials and is responsible for initiating and maintaining the rhythmic contractile activity of the heart. Therefore, it is called the pacemaker.
Q5. 120 0 1200 phyllotaxy occurs in
Answer : Option A
Explaination / Solution:
Phyllotaxy is the arrangement of leaves on a plant stem. 1200 phyllotaxy occurs in Tristichousarrangementin which three leaves are arranged at each node.
Q6. Plant Cytokinesis differ from animals Cytokinesis in having
Answer : Option B
Explaination / Solution:
In plants, cytokinesis or division of cytoplasm occurs due to cell plate formed out of deposition of materials along the equatorial region of cell but in animals cytokinesis occurs due to formation of cleavage furrow in the middle cell membrane.
Q7. pH of urine under healthy conditions is :
Answer : Option C
Explaination / Solution:
The pH of urine under healthy conditions is slightly less than 7 so, slightly acidic in nature.
Q8. Epidermal appendages, unicellular or multicellular outgrowth strictly epidermal in origin is
Answer : Option C
Explaination / Solution:
Trichomes are epidermal appendages, unicellular or multicellular outgrowth strictly epidermal in origin present on the stem of plants.
Q9. Higher plants possess specific areas which take part in the formation of new cells. These area are called
Answer : Option C
Explaination / Solution:
The tissues that have ability of cell division located in specific area are called meristem. They are located at stem and root tips, nodes of stem and intercalary region.
Q10. Which is not the universal rule of nomenclature?
Answer : Option D
Explaination / Solution:
According to the universal rule of nomenclature, the biological names are generally in Latin and written in italics. Hence, the correct option is Biological names are generally in Greek.
