1
Of the following statements, which one is true? (1) DNA bases are adenine, guanine, cytosine, uracil and RNA has adenine, guanine, cytosine, thymine. (2)DNA syhthesises RNA, but RNA generally cannot Synthesise DNA. (3)There is only one type of RNA, whereas there are many types of DNA. (4)DNA is single stranded, RNA is double stranded.
2
The mammalian follicle was first described by1. Von Baer2. De-graef3. Robert Brown4. Spallanzai
3 Animal Kingdom
Identify the correct set of mammals that live wholly in water.
1) Whales,seals,dolphins
2) Seals,whales,shark
3) Hippocampus, whale, scoliodon
4) Rohu,shark,catla
Solution
In aquatic mammals, whales, seals and dolphins live completely in water.
Sharks, rohu, catla are not mammals.
So, the correct option is 'Whales, seals and dolphins'.
4 Principles of Inheritance and Variation
In fruit flies with the curly wing mutation, the wings will be straight if the flies are kept at 16 degrees Celsius. The most probable explanation for this is that
1) fruit flies with curly wings cannot survive at high temperatures 2) the environment influences wing phenotype in these fruit flies 3) height temperatures increases the rate of mutations 4) wing length in these fruit flies is directly proportional to temperature
The environment influences the expression of many genes. For example, identical twins, with identical DNA, may look different from each other because of the different environmental influences.
5
From the petals a red dye is obtained which is used for dyeing silk. 1) Carthamus tinctorius 2) Tagetus erecta 3) Helianthus annus 4) Zinnia elegans
6
The lac operon concept of Escherichia Coli was proposed in 1961 by
(1) Jacob and Monod (2) Meselson and Stahl (3) H.G. Khorana (4) Watson and Crick
7 Plant Kingdom
Meiosis in Spirogyra occurs in 1. Zygote 2. Zygospore 3. Germling 4. Main body
The united protoplasmic mass of two gametes is called zygote or zygospore. Prior to germination, the diploid zygospore nucleus undergoes meosis and forms four nuclei. Three of the four nuclei degenerate since they are smaller in size, The last cell is bigger and grows using the reserve food substances.
8
Hypnotoxin is poisonous fluid produced by1. Parasitic protoza2. Nematocysts3. Sponges4. Ascaris
9
Hypokinetic Hypoxia concerned to
1) Reduced blood flow rate
2) Low O2– content in blood
3) Low O2 in artery
4) Low oxygen content in venous blood
10
In which phase of mitosis the chromosomes are arranged around the equator of the spindle?
(1) Prophase (2) Anaphase
(3) Telophase (4) Metaphase
Your Score:
