Biology - Online Test
Q1. A single strand of nucleic acid tagged with a radioactive molecule is called
Answer : Option C
Explaination / Solution:
A probe is a fragment of DNA or RNA of variable length (usually 100–1000 bases long) which can be radioactively labeled. It can then be used in DNA or RNA samples to detect the presence of nucleotide sequences (the DNA target) that are complementary to the sequence in the probe.
Q2. The concept of ecological pyramids was developed by :
Answer : Option B
Explaination / Solution:
The concept of ecological pyramid was developed by Charles Elton; these pyramids are also known as Eltonian pyramids. The pyramids are a graphical representation which depicts the number of organisms, biomass and productivity at each trophic level.
Q3. The portion of ATPase enzyme that protrudes on outer surface of the thylakoid membrane on the side faces of the stroma
Answer : Option D
Explaination / Solution:
The ATPase enzyme consists of two parts: one called the is embedded in the membrane and forms a transmembrane channel that carries out facilitated diffusion of protons across the membrane. The other portion is called and protrudes on the outer surface of the thylakoid membrane on the side that faces the stroma.
Q4.
Match the following:
| Animal | Respiratory Organ |
| a) Nereis | i) Book Lungs |
| b) Limulus | ii) Book Gills |
| c) Palaemon | iii) General Body Surface |
| d) Palamnaeus | iv) Parapodia |
| e) Dugesia | v) Gills |
Answer : Option D
Explaination / Solution:
Respiratory organ of Nereis is parapodia, Limulus is book gills, Palamnaeus is book lungs and respiratory organ of Dugesia is general body surface. Palaemon respire through gills.
Q5. Inbreeding is necessary if you want to evolve a
Answer : Option B
Explaination / Solution:
Pure line is necessary for carrying out breeding programmers. Pure line is obtained by inbreeding plants followed by test crossing until we get homozygous plants for particular traits.
Q6. Which of the following is a biosphere reserve in eastern Himalayan regions:
Answer : Option D
Explaination / Solution:
The Dihang-Dibang Biosphere Reserve is situated in the districts of West Siang, Upper Siang and Dibang valley of Arunachel Pradesh in eastern Himalayan range. This reserve is almost totally forested, having villages and cultivated lands located on lower slopes and terrace edging the major river systems. The reserve is the last stronghold for many Himalayan species.
Q7. The aquatic organisms that can actively swim at will against the water current is
Answer : Option D
Explaination / Solution:
Necton is an aquatic organism that can actively swim at will against the water current. Benthos and planktons float with water current and not against the water current.
Q8. The inner most wall layer of microsporangium is called as
Answer : Option D
Explaination / Solution:
Microsporangium is covered by a number of layers. The outer layer or integuments surround the tepetum. The tepetum provide nutrients to growing microspores that leads to pollen grains.
Q9. Which pair is similar
Answer : Option C
Explaination / Solution:
Graafian follicle changes into corpus leteum as egg is released from it during ovulation. Corpus leteum release hormone called androgen.
Q10. Nicotinamide can be synthesised in human body from
Answer : Option A
Explaination / Solution:
Tryptophan is an amino acid needed for normal growth in infants and for nitrogen balance in adults. Nicotinamidecan be synthesized in human body from tryptophan.
