CBSE 11TH BIOLOGY - Online Test
Q1. Aerating pores in the bark of plants is known as
Answer : Option B
Explaination / Solution:
In plants respiratory organs in stem is called lenticels. They are located as pores in the bark of plants.
Q2. Which one is not a phase of Growth
Answer : Option D
Explaination / Solution:
Growth phase consists of leg phase, exponential phase and stable phase. It do not consist of linear phase.
Q3. In which organism protoplasm and cellular structure is absent
Answer : Option D
Explaination / Solution:
The protoplasm and cellular structure is absent in Virus. Virus consists of genetic material (DNA or RNA) along with a capsule of protein without any cellular structure.
Q4. Which of the following is not a part of hip bone?
Answer : Option D
Explaination / Solution:
Hip bone or pelvic girdle consists of two coxal bones. Each coxal bone is formed by the fusion of three bones- ilium, ischium and pubis..
Q5. Select the correct equation from the following
Answer : Option C
Explaination / Solution:
Water potential of a cell is affected by both solute and pressure potential. The relationship between them is as follows:
Q6. The cell lining the blood vessels are
Answer : Option D
Explaination / Solution:
Endothelium is a type of epithelium that lines the interior surface of blood vessels and lymphatic vessels, forming an interface between circulating blood or lymph in the lumen and the rest of the vessel wall. It is a thin layer of simple squamous called endothelial cells
Q7. Which archaebacteria is present in the guts of ruminant animals such as cows and buffaloes?
Answer : Option D
Explaination / Solution:
Methanogens are present in the guts of several ruminant animals such as cows and buffaloes and they are responsible for the production of methane (biogas) from the dung of these animals.
Q8. Which one is prerequisite for nitrogen fixation?
Answer : Option B
Explaination / Solution:
During nitrogen fixation atmospheric nitrogen is converted into nitrates and nitrites. When deficiency of nitrate occurs in soil, nitrogen fixation occurs. So, nitrate deficiency is prerequisite for nitrogen fixation.
Q9. Blood vessels are found to be present in which region of eye?
Answer : Option D
Explaination / Solution:
The middle layer, choroid contains many blood vessels and looks bluish in colour.
Q10. Which plant division is known as amphibians of the plant kingdom?
Answer : Option B
Explaination / Solution:
Bryophytes are also called amphibians of the plant kingdom because these plants can live in soil but are dependent on water for sexual reproduction as they release antherozoids into water where they come in contact with archegonium to produce zygote.
