Biology - Online Test
Q1. 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
Q2. 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.
Q3. The cleavage of the zygote or earlier stage of its development into two or more units to form many embryo is called as
Answer : Option B
Explaination / Solution:
Zygote may divides into two or more parts to develop multiple embryos. The formation of more than one embryo inside the same ovule by cleavage is called cleavage polyembryony.
Q4. Diapause is shown by
Answer : Option C
Explaination / Solution:
Dispause is a period during which growth and development is suspended and physiological activity is diminished to adverse environmental condition. Diapause occurs in monarch butterfly and silk worm.
Q5. 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.
Q6.
Answer : Option B
Explaination / Solution:
An amylase is an enzyme that catalyses the hydrolysis of starch into sugars. Amylase is present in the saliva of humans and some other mammals, where it begins the chemical process of digestion. it is a major digestive enzyme, and its optimum pH is 6.8
Q7. A tumor enclosed within a capsule is termed
Answer : Option B
Explaination / Solution:
A tumor enclosed within a capsule is called benign tumor. Benign tumors normally remain confined to their original location and do not spread to other parts of the body and cause little damage.
Q8. 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.
Q9. 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.
Q10. Lysosomes are produced by
Answer : Option D
Explaination / Solution:
Lysosomes are manufactured and budded into the cytoplasm by the Golgi apparatus with enzymes inside.
The enzymes that are within the lysosome are made in the rough endoplasmic reticulum, which are then delivered to the Golgi apparatus via transport vesicles.
