CBSE 12TH BIOLOGY - Online Test
Q1. Which one the following in not an Intra-uterine device
Answer : Option B
Explaination / Solution:
Vaults is not an intra-uterine device used by females to prevent unwanted pregnancy. It is a barrier method of contraception made of rubber.
Q2. The seeds dispersed by wind must not be
Answer : Option D
Explaination / Solution:
Dispersal of seed is necessary for proper growth of seed. The seeds located close to each other may have struggle for existence. The wind dispersed must be light, minute and winged so that it can be carried by wind easily. Sticky seeds remain attached with each other.
Q3. Among hydrophytes which of the following xylem component remains absent?
Answer : Option D
Explaination / Solution:
Xylem vessels are responsible of water transportation in plants. Hydrophytes grows in plants therefore there is no requirement of special water transporting tissues in hydrophytes.4
Q4. Use of anti-histamines and steroids give a quick relief from
Answer : Option B
Explaination / Solution:
Anti-histamines and steroids give a quick relief from allergy. Allergy may be due to allergen like pollen grains, dust or other microbes. Common symptom of allergy is inflammation on skin.
Q5. What is called Griffith effect?
Answer : Option C
Explaination / Solution:
Griffith's experiment, was an experiment done in 1928 by Frederick Griffith. It was one of the first experiments showing that bacteria can get DNA through a process called transformation.
Griffith carried out experiment on mice using pneumonia causing bacteria to show that DNA is the genetic material by transforming non-virulent strain into virulent strain which is called bacterial transformation.
Q6. The capacity to generate a whole plant from any cell or ex-plant is called
Answer : Option C
Explaination / Solution:
The capacity to generate a whole plant form any cell or ex-plant is called totipotency. Plants are totipotent and from small part of plant new whole plant can be grown.
Q7. World wetland day:
a) Is celebrated every year on 2nd January.
b) In 2014, Indian ministry organised it’s celebrations at the chilka lake.
a) Is celebrated every year on 2nd January.
b) In 2014, Indian ministry organised it’s celebrations at the chilka lake.
Answer : Option C
Explaination / Solution:
World Wetlands Day is celebrated every year on 2 February. This day marks the date of the adoption of the Convention on Wetlands on 2 February 1971, in the Iranian city of Ramsar on the shores of the Caspian Sea.
In 2014, Indian ministry organised it’s celebrations at the chilka lake.
Q8. Sperms are of
Answer : Option B
Explaination / Solution:
Half of the sperm contain X-sex chromosome and remaining half contain Y-sex chromosome. Hence two kinds of sperms are formed by human male.
Q9. XO type of sex determination is found in
Answer : Option C
Explaination / Solution:
In grasshopper, sex determination is of XO type, in which the males have only one X-chromosome besides the autosomes whereas females have a pair of X-chromosome.
Q10. What is the common name of Drosophila melanogaster?
Answer : Option D
Explaination / Solution:
Drosophila melanogaster is a species of fly (the taxonomic order Diptera) in the family Drosophilidae. The species is known generally as the common fruit fly or vinegar fly. A number of experiments related to inheritance of trait were carried out on this small fly.
