CBSE 11TH BIOLOGY - Online Test
Q1. Which one of the following has the highest number of species in nature?
Answer : Option D
Explaination / Solution:
Insects have the highest number of species in nature. Insect belongs to arthropods family of class Mammalia. They are charecterised by jointed legs.
Q2. The plane of alignment of chromosome at metaphase is referred to as
Answer : Option B
Explaination / Solution:
The plane of alignment of the chromosomes at metaphase is referred to as the metaphase plate. This stage is also called as tetrad stage.
Q3. Read the following about renal threshold :
i. The renal threshold of glucose is 180 mg/100ml of blood.
ii. If blood level of glucose exceeds 180mg, it leads to diabetes insipidus.
iii. If blood level of glucose exceeds 180mg, it leads to diabetes mellitus.
i. The renal threshold of glucose is 180 mg/100ml of blood.
ii. If blood level of glucose exceeds 180mg, it leads to diabetes insipidus.
iii. If blood level of glucose exceeds 180mg, it leads to diabetes mellitus.
Answer : Option D
Explaination / Solution:
The renal threshold is the state when glucose is present in urine. The renal threshold of glucose is 180 mg/100 ml of blood. If blood glucose level exceeds 180 mg, it leads to diabetes insipidus.
Q4. Monocotyledonous leaves are
Answer : Option B
Explaination / Solution:
Monocotyledonous leaves are isobilateral as both the lower and upper sides of the leaves are the same.
Q5. A group of closely related families is called
Answer : Option B
Explaination / Solution:
Class includes a group of related orders, Genus comprises a group of related species, species is a basic unit of classification. Hence, the correct option is Order.
Q6. Auxins are mostly produced in
Answer : Option C
Explaination / Solution:
Auxins are generally produced in growing apices of shoot and root. These two regions are the meristematic cells which are actively taken part in cell division.
Q7. In a woman, pelvis is larger and has broader front than a man. It is :
Answer : Option D
Explaination / Solution:
In a woman, pelvis is larger and has broader front than a man. It is an adaptation for gestation and parturition during pregnancy.
Q8. Intercalated discs occurs
Answer : Option B
Explaination / Solution:
Intercalated discs are microscopic identifying features of cardiac muscles fibres. Individual heart muscle cells are connected by intercalated discs to work as a single functional organ.
Q9. The body of fungus is filamentous and it is called
Answer : Option B
Explaination / Solution:
The body of filamentous fungus is known as mycelium, which is a thread like structure. Mycelium produces hyphae and sporegenous cells to produce spores.
Q10. Osmotic pressure cannot became zero in a cell. It is zero only in case of
Answer : Option A
Explaination / Solution:
Osmotic pressure cannot become zero in cell as it always content some amount of solute particles. Osmotic pressure is zero only in case of pure water or distilled water.
