Biology - Online Test
Q1. The process of evolution of different species in a given geographical area starting from a point and radiating to other geographical area is called
Answer : Option B
Explaination / Solution:
In evolutionary biology, adaptive radiation is a process in which organisms diversify rapidly from an ancestral species into a multitude of new forms, particularly when a change in the environment makes new resources available, creates new challenges, or opens new environmental niches.
Q2. The shape of guard cells in grasses is
Answer : Option B
Explaination / Solution:
Dumb-bell-shaped guard cells are found in grasses. Dumb-bell shaped guard cells are more advanced in evolutionary terms and more efficient physiologically because guard cells of grasses require fewer solutes and less water to achieve a given unit increase in aperture.
Q3. Choose the correct sequence of taxonomic categories in descending order
Answer : Option A
Explaination / Solution:
The correct sequence of taxonomic categories form higher to lower are Division-Class-Order-Family-Genus-Species.
Q4. Auxin was isolated from tips of coloeptile of oat seedlings by
Answer : Option A
Explaination / Solution:
Auxin was first collected by F.W. Went (1928) from coleoptile tip of Avena. He also developed Avena curvature test for bioassay of auxin.
Q5. Hydra reproduce asexually by
Answer : Option D
Explaination / Solution:
In Hydra small outgrowth develops at the bottom side which grows into a bud. The well-developed buds detach from the parent body as new individual.
Q6. Earth crust is the reservoir of sedimentary type of nutrients like
Answer : Option A
Explaination / Solution:
Earth crust is the reservoir of sedimentary type of nutrients like phosphorus. Atmosphere is the reservoir of gaseous types of cycle like oxygen and nitrogen along with carbon.
Q7. Select the correctly matched pair :
Answer : Option A
Explaination / Solution:
Last 2 pairs i.e., 11th and 12th of ribs are not connected ventrally and are therefore, called floating ribs.
Q8. Which of the following is not a use of transgenic animals?
Answer : Option D
Explaination / Solution:
Transgenic animals are developed to study normal physiology and development, vaccine testing, chemical safety testing, obtaining biological product etc. These animals are not used to study viral disease.
Q9.
Assertion: There is a statutory ban amniocentesis on sex determination in India.
Reason: Amniocentesis is used to determine sex of foetus for female foeticide.
Answer : Option C
Explaination / Solution:
The statutory ban on amniocentesis for sex determination is due to increasing female foeticide after knowing the sex of baby using the chromosomal pattern of amniotic fluid surrounding the foetus.
Q10. Lymph contains
Answer : Option D
Explaination / Solution:
Lymph contains serum and WBC. Lymph is called as extracellular fluid that help in transport of fat and protein. It contains WBC, so also help in protection against the infection.
