Biology - Online Test
Q1. The larvae of urochordates is called
Answer : Option A
Explaination / Solution:
The larvae of urochordates is called tadpole. Tadpolechange into adults by the process of metamorphosis. The structure of tadpole is totally different from the adult ones.
Q2. Rop genes in pBR322 codes for
Answer : Option A
Explaination / Solution:
The plasmid pBR322 contains a Rop gene coding for the Rop protein, which promotes conversion of the unstable RNA I – RNA II complex to a stable complex.
Rop genes in pBR322 codes for protein involved in replication of plasmid. Plasmid are able to take the foreign gene and to be transferred to target cells.
Q3.
Read the following :
i. Infants and toddlers are often under habit of bed wetting since micturition is a reflex process.
ii. Adults and grown up children can control this reflex process, voluntarily to some extent.
Answer : Option C
Explaination / Solution:
The process of release of urine is called micturition and the neural mechanism causing it is called the micturition reflex. Adults and grown up children can control the reflex process of micturition voluntarily to some extent.
Q4. The diagram represents Miller experiment. Choose the correct combination of labeling.
Answer : Option D
Explaination / Solution:
In Urey and Miller experiment the set up labeled as A – electrodes, B – (NH3 + H2 + H2O + CH4), C – cold water, D – Vacuum, E – U Trap.
Q5. Select the correct statement.
Answer : Option A
Explaination / Solution:
The roots of extant vascular cryptogams and most monocotyledons do not show any secondary growth; they remain entirely primary throughout their life.
Q6. The basic unit of classification is
Answer : Option B
Explaination / Solution:
The basic unit of classification is species. Species are population of organisms that can inter breed among themselves to produce new organisms.
Q7. Which plant hormone is named anti-ageing hormone?
Answer : Option B
Explaination / Solution:
A unique role of cytokinins is to produce anti-aging effects on some plant parts. Cytokinins actually provide a younger, healthier look in plants. By adding this hormone to cut flowers, florists are able to slow down the aging process, providing us with prettier flowers for longer.
Q8. More complex organism cannot give rise to new individuals through regeneration because
Answer : Option A
Explaination / Solution:
Complex multicellular organisms have division of labour and tissues are specialized to perform specific function. In regeneration, new individual regains the lost body parts but higher organism cells are not capable to produce all kind of cells.
Q9. The individual transitional communities to inhabit an area are commonly called as:
Answer : Option C
Explaination / Solution:
A seral community (or sere) is an intermediate stage found in ecological succession in an ecosystem advancing towards its climax community. In many cases more than one seral stage evolves until climax conditions are attained. seral communities leads to climax communities.
Q10. The following X-ray shows :
Answer : Option A
Explaination / Solution:
The X-ray of knee shows gout in the knee. Gout is a kind of arthritis. It can cause an attack of sudden burning pain, stiffness and swelling in joint.
