11. Who among the following analysed the DNA for the first time ?
[A] Watson and Krick
[B] Karl von Frisch
[C] M. W. Nirenberg
[D] Hargobind Khurana
Show Answer
Correct Answer: A [Watson and Krick]
Notes:
The discovery in 1953 of the double helix, the twisted-ladder structure of deoxyribonucleic acid (DNA), by James Watson and Francis Crick marked a milestone in the history of science and gave rise to modern molecular biology, which is largely concerned with understanding how genes control the chemical processes.
12. Synapse gap is present between which of the following?
[A] Brain and Spinal cord
[B] Two eyes
[C] Two Kidneys
[D] Two neurons
Show Answer
Correct Answer: D [Two neurons]
Notes:
Information from one neuron flows to another neuron across a synapse. The synapse contains a small gap separating neurons. The synapse consists of: a presynaptic ending that contains neurotransmitters, mitochondria and other cell organelles.
13. The main components of biogas are
[A] Methane and Sulphur di-oxide
[B] Methane, Hydrogen and Nitric oxide
[C] Methane and Nitric oxide
[D] Methane and Carbon di-oxide
Show Answer
Correct Answer: D [Methane and Carbon di-oxide]
Notes:
Biogas comprises of CH4, CO2 and small amounts of H2S.
14. Who among the following discovered Vitamin C?
[A] Albert Szent-Györgyi
[B] Funk
[C] Evans and Bishop
[D] Henrik Dam
Show Answer
Correct Answer: A [Albert Szent-Györgyi]
Notes:
Albert Szent-György is the scientist who discovered Vitamin C. Vitamin C is a water-soluble vitamin. The chemical name is Ascorbic acid.
15. What is the basic unit of Classification?
[A] Genus
[B] Species
[C] Order
[D] Family
Show Answer
Correct Answer: B [Species]
Notes:
Species is the basic unit of classification. Species are known as the basic units of classification because individuals of species are closely related structurally and functionally and can interbreed freely.
16. Protein is made up of which of the following?
[A] Sugar
[B] Amino acid
[C] Carbohydrate
[D] Fatty acid
Show Answer
Correct Answer: B [Amino acid
]
Notes:
All proteins are linked by a peptide link and are polymers of amino acids. Amino acid is the building block of protein.
17. The cell wall of Spirogyra contains__?
[A] Cellulose
[B] Chitin
[C] Lignin
[D] Suberin
Show Answer
Correct Answer: B [Chitin]
Notes:
Chitin is used to build the cell wall. Each cell of Spirogyra is surrounded by a two-layered cell wall.
18. What does Prothallus represent?
[A] sporophytic phase in a fern
[B] gametophytic phase in a fern
[C] sporophytic phase in a gymnosperm
[D] gametophytic phase in a gymnosperm
Show Answer
Correct Answer: B [gametophytic phase in a fern]
Notes:
Prothallus represents the gametophytic phase in a fern. The diploid sporophyte represents a major, independent, photosynthetic, and vascular plant body.
19. Gymnosperms are called naked seed plants because of the lack of which of the following?
[A] Cotyledon
[B] Endosperm
[C] Ovary Wall
[D] Testa
Show Answer
Correct Answer: C [Ovary Wall]
Notes:
Gymnosperms are called naked seed plants because of the lack of Ovary Wall.
20. Which of the following is a polyembryony?
[A] the production of fruit from an unfertilized egg
[B] the phenomenon of more than one embryo developing from a single ovule
[C] pollination is required to produce fruits
[D] None of these
Show Answer
Correct Answer: B [the phenomenon of more than one embryo developing from a single ovule]
Notes:
Polyembryony is the phenomenon of more than one embryo developing from a single ovule. Its occurs commonly in many animals and plants.
