CBSE 11TH BIOLOGY - Online Test
Q1. A dwarf person showing stunted growth and mental retardation both, is a result of hyposecretion of
Answer : Option A
Explaination / Solution:
Hypothyroidism causes defective development and maturation of the growing baby leading to stunted growth (cretinism), mental retardation, low intelligence quotient, abnormal skin, deaf-mutism, etc.
Q2. The largest phylum of kingdom animalia is
Answer : Option C
Explaination / Solution:
This is the largest phylumof Animalia which includes insects.
Q3. Lipids that are found in the cell membrane are
Answer : Option C
Explaination / Solution:
Some lipids have phosphorous and a phosphorylated organic compound in them. These are phospholipids. They are found in cell membrane.
Q4.
Which of the following statements doesn’t hold true for blood clotting cascade?
i. Ruptured platelets release thromboplastin.
ii. Prothrombinis converted into thrombin in the presence of vitamin K and Na+ions.
iii. Fibrinogen is converted into fibrin through enzymatic action of thrombin in the presence of Ca++ions
iv. Fibrin makes clot via process of polymerisation.
Answer : Option B
Explaination / Solution:
Ruptured platelets release thromboplastin. Fibrinogen present in blood plasma is converted into fibrin through enzymatic action of thrombin. Fibrin makes clot via process of polymerisation.
Q5. At the end of citric acid cycle, most of the energy is transferred to
Answer : Option D
Explaination / Solution:
Citric acid cycle or start with pyruvate and leads to complete oxidation of glucose to carbon dioxide and energy in form of ATP, NADH and .
At end of citric acid cycle, most of the energy is transferred to NADH and .
Q6. A plant in which adventitious roots develop chlorophyll and perform photosynthesis is
Answer : Option C
Explaination / Solution:
Tinospora develops adventitious roots having chlorophyll and perform photosynthesis. This kind of roots develops from stems andhang in air.
Q7. Dinoflagellates possess condensed chromosomes even in interphase, their nucleus is called
Answer : Option B
Explaination / Solution:
Dinoflagellates are unicellular protists. They possess condensed chromosomes even during interphase. Their nucleus is called as mesokaryon.
Q8. During urine formation, the tubular cells secrete ------------------ into the filtrate.
Answer : Option D
Explaination / Solution:
The substances that are secreted into the tubular fluid (for removal from the body) include:
- Potassium ions (K+),
- Hydrogenions (H+),
- Ammonium ions (NH4+),
- creatinine,
- urea,
- some hormones,
- and some drugs (e.g. penicillin).
Q9. Which one function as “Biological check post”
Answer : Option B
Explaination / Solution:
Endodermis forms the outermost layer of vascular bundles. Anything entering inside the plant body must cross theendodermis to be transported via xylem and phloem. So, endodermis is called as biological check post of the cell.
Q10. Exponential growth is dependent on
Answer : Option B
Explaination / Solution:
Exponential growth is dependent on initial size, rate of growth and time interval.
