Mixed Test (Biology)
This test is aimed at students studying in Class 12 of CBSE Board. The test covers the whole syllabus of Class 12.
Questions
Which of the following is a hybrid variety of rice developed in India?
- Sonalika
- Pusa Swarnim
- Pusa Sadabahar
- Ratna
- Kalyan Sona
Which of the following organisms reproduce(s) using asexual reproductive structures called conidia?
- Chlamydomonas
- Penicillium
- Hydra
- Sponge
- Phycomycetes
What is apomixis?
- It is the process of formation of seeds without fertilisation.
- It is the phenomenon of formation of more than one embryo in the seed.
- It is the phenomenon of development of fruits without fertilisation.
- It is the mechanism of transfer of pollen grains from anther to stigma.
- It is the process of formation of haploid microspores from diploid pollen mother cell through meiosis.
Which of these is involved in the synthesis and secretion of androgens?
- Leydig cells
- Sertoli cells
- Prostate gland
- Bulbourethral glands
- Seminal vesicles
Arun and Nisha are siblings. Their father is colour blind whereas their mother is normal. If Arun is colour blind then what is the chance that Nisha is also colour blind?
- 100%
- 75%
- 50%
- 25%
- 0%
Which of these antibodies is responsible for allergic and inflammatory reactions?
- IgA
- IgE
- IgG
- IgM
- IgD
Which one of the following is the cause of Klinefelter’s syndrome?
- Absence of one of the X-chromosomes i.e. 45 with XO.
- Presence of an additional copy of X-chromosome i.e. 47 with XXY.
- Presence of an additional copy of chromosome number 21.
- Substitution of glutamic acid (Glu) by valine (Val) at the sixth position of the beta globin chain of haemoglobin molecule.
- Lack of enzyme that converts the amino acid phenylalanine into tyrosine.
Which of these is an example of analogous organs?
- Forelimbs of whales, bats, cheetahs and humans
- Thorns and tendrils of bougainvillea and cucurbita
- Eyes of octopi and mammals
- Mouth parts of a honey bee and a mosquito
- Vertebrae of giraffes, whales and human beings
Which of the following is the sequence of m-RNA?
- 3’-TACGTACGTACGTACG-5’
- 3’-UACGUACGUACGUACG-5’
- 3’-AUGCAUGCAUGCAUGC-5’
- 5’-ATGCATGCATGCATGC-3’
- 5’-AUGCAUGCAUGCAUGC-3’
What is the name of the enzyme which removes nucleotides from the outer ends of the DNA?
- Restriction Endonuclease
- Restriction Exonuclease
- DNA ligase
- DNA polymerase
- RNA polymerase
Which one of the following microbes is used to produce citric acid?
- Aspergillus niger
- Acetobacter aceti
- Clostridium butylicum
- Lactobacillus
- Yeast
Which of these is not a method to control air pollution?
- Electrostatic Precipitator
- Catalytic Converter
- Organic Farming
- Scrubber
- Use of lead free fuel
What is the name of the process of decomposition by which water soluble inorganic nutrients go down into the soil horizon and get precipitated as unavailable salts?
- Humification
- Mineralisation
- Catabolism
- Leaching
- Fragmentation
Who observed the relationship between area under consideration and species richness?
- Paul Ehrlich
- Alexander von Humboldt
- Robert Constanza
- A.G. Tansley
- Charles Darwin
Interspecific interactions arise from the interaction of populations of two different species. In which of these interactions, one species is harmed whereas the other is unaffected?
- Mutualism
- Competition
- Parasitism
- Commensalism
- Amensalism