Biology - Online Test
Q1. Parrots have life span of about
Answer : Option C
Explaination / Solution:
The life span of parrot is about 140 years. It is much more than other common animals living in our surrounding. Even more than human being life span.
Q2. A lateral branch with short internodes and each node bearing a rosette of leaves and a tuft of roots is found in
Answer : Option C
Explaination / Solution:
A lateral branch with short internodes and each node bearing a rosette of leaves and a tuft of roots is found in aquatic plants such as Pistia and Eicchornia.
Q3. In which stage, the cells remain metabolically active but do not proliferate?
Answer : Option C
Explaination / Solution:
In Go stage the cells are in a metabolically active state but do not divide unless there are some abnormal genes which reverses the same. This stage is also called quiscent stage. Examples human nerve cells.
Q4. Lysozyme kills bacteria by destroying
Answer : Option D
Explaination / Solution:
Lysozyme is capable of breaking the chemical bonds in the outer cell wall of the bacteria. Bacterial cell walls contain a layer of peptidoglycan, which is the specific site that lysozyme targets.
The peptidoglycan layer contains alternating molecules called N-acetylglucosamine and N-acetylmuramic acid. These molecules form a strong glycan chain that act as the backbone for the cell wall.
The link between the N-acetylglucosamine and N-acetylmuramic acid is cleaved by lysozyme. Once this chain is broken by lysozyme, it results in bacterial death.
Q5.
In the human kidney :
i. outer zone is called medulla and inner zone is called cortex.
ii.cortex extends between medullary pyramidsas renal columns of Bellini.
Answer : Option C
Explaination / Solution:
Inside the kidney, there are two zones, an outer cortex and an inner medulla. The cortex extends in between the medullary pyramids as renal columns called columns of Bertini.
Q6. Evidences of evolutionary relationship are found in ______.
Answer : Option C
Explaination / Solution:
Evidence of evolutionary relationship are found in fossils in different way. Some fossils act as connecting link between two species. Fossils are found at different depth in earth crust that give evidence of existence of different period of time.
Q7. Which is not the function of parenchymatous cells?
Answer : Option A
Explaination / Solution:
The parenchyma performs various functions like photosynthesis, storage, secretion.
Q8. The phenomenon of heterophyll is an example of
Answer : Option C
Explaination / Solution:
Plants follow different pathways in response to environment or phases of life to form different kinds of structures. This ability is called plasticity. This phenomenon of heterophylly is an example of plasticity.
Q9. Living things differ from non-living things in a manner that
Answer : Option C
Explaination / Solution:
The cellular level organisation of the body is the defining feature of life forms or living things. Hence, the correct option is Living things have different level of organisation.
Q10. Polymerisation of actin monomers involves ATP hydrolysis as shown in the following figure : [choose the correct one]
Answer : Option C
Explaination / Solution:
Each ‘F’ actin is a polymer of monomeric ‘G’ (Globular) actins.
