Biology - Online Test
Q1. The property of Taq polymerase explored in PCR is
Answer : Option D
Explaination / Solution:
Taq polymerase is a thermostable DNA polymerase. Taq polymerase is an enzyme that copies DNA. It is isolated from a heat-loving bacterium that is naturally found in hot springs, so the enzyme doesn't break down at the high temperatures necessary for copying DNA using a polymerase chain reaction.
Q2. Select the mismatched pair of the following :
Answer : Option D
Explaination / Solution:
Cortical nephron is about 25% of total nephrons. Glomerular filtration rate is 180 litre per day. Juxtamedullary nephron makes about 15% of total nephrons but lung do not removes 180 L of carbon dioxide per day.
Q3. Lichen can be used as industrial pollution indicators because
Answer : Option C
Explaination / Solution:
The hardy lichens are useful bioindicators for air pollution, espeially sulfur dioxide pollution, since they derive their water and essential nutrients mainly from the atmosphere rather than from the soil. It also helps that they are able to react to air pollutants all year round. Lichens are symbiotic association between algae and fungi.
Q4. Which of the following do not undergo any secondary growth?
Answer : Option B
Explaination / Solution:
Secondary growth in monocotyledonous roots is not observed as cambium is absent between xylem and phloem in a vascular bundle.
Q5. In taxonomic hierarchy, the various categories are arranged in
Answer : Option A
Explaination / Solution:
Kingdom -> Phylum/Division -> Class -> Order -> Family -> Genus -> Species. Hence, the correct option is Descending order.
Q6. Which hormone is responsible for dormancy?
Answer : Option A
Explaination / Solution:
Abscistic acid encourages fruit to drop and leaves to fall. When the plant is low on water abscistic acid closes the stomata, pores in the leaves. It encourages both seeds and plants to go dormant.The hormone induces seeds to produce proteins to store when the seeds are dormant.
Q7. The internal buds produced by Spongila is known as
Answer : Option A
Explaination / Solution:
Gemmules are internal buds found in sponges and are involved in asexual reproduction. It is an asexually reproduced mass of cells, that is capable of developing into a new organism i.e., an adult sponge
Q8. Universal non-polluting source of energy is
Answer : Option A
Explaination / Solution:
Universal non-polluting source of energy is sun. All the sources of energy are directly and indirectly derived from sun including fossil fuels.
Q9.
Match the following bones and their synonyms :
column A
a) Hipbone
b) Kneebone
c) Collarbone
d) immovable joint
column B
i) patella
ii) clavicle
iii) suture
iv) innominate
Answer : Option B
Explaination / Solution:
Hip bone is called as innominate bone, kneebone is called as patella, collarbone is called as clavicle and immovable joint is called suture.
Q10. Rosie’s milk is enriched nutritionally as it has
Answer : Option D
Explaination / Solution:
The first transgenic cow Rosie produced human protein enriched milk. The milk contained Alpha lactalbumin which was nutrionally more balanced than normal cow milk for babies.
