CBSE 11TH BIOLOGY - Online Test
Q1. Which meristem contributes to the formation of the primary plant body?
Answer : Option A
Explaination / Solution:
Both apical meristems and intercalary meristems are primary meristems because they appear early in life of a plant and contribute to the formation of the primary plant body.
Q2. The process of despecialisation of differentiated cells so that they become undifferentiated and meristematic is called
Answer : Option C
Explaination / Solution:
The process of de-specialisation of differentiated cells so that they become undifferentiated and able to divide is known as dedifferentiation. It involves activation of certain genes which not only reverse differentiation but also stimulate cell division.
Cork cambium, wound cambium and inter-fascicular vascular cambium are always produced through dedifferentiation.
Q3. The expansion of ICBN is
Answer : Option C
Explaination / Solution:
The scientific names are based on agreed principles and criteria, which are provided in International Code for Botanical Nomenclature (ICBN). Hence, the correct option is International code of botanical nomenclature.
Q4. Study of muscles is called :
Answer : Option B
Explaination / Solution:
Myology is the study of the muscular system, including the study of the structure, function and diseases of muscle.
Q5. Some carrier proteins allow diffusion by both molecules cross the membrane in the same direction is
Answer : Option B
Explaination / Solution:
Some carrier or transport proteins allow diffusion only if two types of molecules move together. In a symport, both molecules cross the membrane in the same direction.
Q6. The epithelium involved in diffusion is
Answer : Option D
Explaination / Solution:
The squamous epithelium is made of a single thin layer of flattened cells with irregular boundaries. They are found in the walls of blood vessels and air sacs of lungs and are involved in functions like forming a diffusion boundary.
Q7. In five kingdom of classification, Whittaker assigned eukaryotes to
Answer : Option D
Explaination / Solution:
In Whittaker’s five kingdom of classification, kingdom protista, kingdom fungi, kingdom plantae and kingdom Animalia are eukaryotic organisms. The kingdom monera include prokaryotic organisms.
Q8. Glucocorticoids regulate metabolism of :
Answer : Option D
Explaination / Solution:
The name glucocorticoid (glucose + cortex + steroid) is composed from its role in regulation of glucose metabolism, synthesis in the adrenal cortex, and its steroidal structure.
The principal glucocorticoid hormone is cortisol, which regulates the metabolism of proteins, carbohydrates, and lipids.
Q9. The ion which activates many enzymes involved in photosynthesis,respiration, nitrogen metabolism is
Answer : Option D
Explaination / Solution:
It is absorbed in the form of manganous ions (Mn2+). It activates many enzymes involved in photosynthesis, respiration and nitrogen metabolism.
Q10. Which of the following is not a part of colon?
Answer : Option A
Explaination / Solution:
The colon is divided into three parts – an ascending, a transverse and a descending part.
