Biology - Online Test
Q1. The smallest free living organism are
Answer : Option B
Explaination / Solution:
PPLO (Pleuro Pneumonia Like Organisms). They are generally smaller and multiply more rapidly than the eukaryotic cells.
Q2. Beadle and Tatum showed that each kind of mutant bread mould they studied lacked a specific enzyme. Their experiments demonstrated that
Answer : Option B
Explaination / Solution:
Sir Archibald Garrod, a British medical doctor, was the first to suggest that genes were connected to enzymes.
George W. Beadle (1903-1989) and Edward L. Tatum (1909-1975) show genes direct the synthesis of enzymes that control metabolic processes using genetic and biochemical studies of the bread mold Neurospora.
Q3. When the main pool is located in the soil and rocks, that nutrient cycle is called
Answer : Option D
Explaination / Solution:
The nutrient cycle in which reservoir is located in earth crust is called sedimentary nutrient cycle. So, soil and rock based nutrient cycles are example of sedimentary nutrient cycle.
Q4. Accessory pigments protect plants from
Answer : Option C
Explaination / Solution:
Other thylakoid pigments like chlorophyll b, xanthophylls and carotenoids, which are called accessory pigments, also absorb light and transfer the energy to chlorophyll a. Indeed, they not only enable a wider range of wavelength of incoming light to be utilized for photosynthesis but also protect chlorophyll a from photo-oxidation.
Q5. The correct sequence of respiration is i) Breathing in oxygen ii) Transportation of gases by the blood iii) Diffusion of gases between blood and tissues iv) Diffusion of gases across alveolar membrane v) Using of oxygen and releasing of carbondioxide
Answer : Option B
Explaination / Solution:
Respiration involves breathing or pulmonary ventilation by which atmospheric air is drawn in, Diffusion of gases across alveolar membrane, Transport of gases by the blood, Diffusion of gases between blood and tissues.Utilisation of oxygen by the cells.
Q6. Which of the following variety of wheat is resistant to leaf and strip rust and hill bunt disease?
Answer : Option D
Explaination / Solution:
Himgiri wheat variety is resistant to disease like leaf and strip rust and hill bunt disease that cause great loss of productivity due to loss of plant parts.
Q7. Tropical Botanical garden and research institute is situated at
Answer : Option D
Explaination / Solution:
Tropical Botanic Garden and Research Institute (TBGRI) is an autonomous institute established by the Government of Kerala in 1979 at Thiruvanantapuram, Kerala.
The institute conducts research in Conservation Biology, Biotechnology, Plant Taxonomy, Microbiology, Phytopharmocology, Ethnomedicine and Ethopharmacology for plant improvement and utilisation.
TBGRI also undertakes research on medicinal plants, ornamental plants and various introduced plants of economic or aesthetic value. The institute conserves the largest number of plant species among the botanical gardens in Asia
Q8. Which of the following have notochord throughout life?
Answer : Option A
Explaination / Solution:
Amphioxus or lancelets are fish like marine chordates found in shallow temperate and tropical seas. They have notochord through out their life.
Q9. Which one shows meiosis
Answer : Option A
Explaination / Solution:
Anther produces pollen grains by the process of meiosis in which four microspores are produced by single microspore mother cell. The number of chromosome reduces to half.
Q10. Corpus spongiosum is found in
Answer : Option D
Explaination / Solution:
The corpus spongiosum is the mass of spongy tissue surrounding the male urethra within the penis. These tissues get filled with blood during copulation.
