Practice Genetics evolution of life and ecological biodiversity - general science mcq Online Quiz (set-2) For All Competitive Exams
Q-1) The largest flower found is known as
(a)
(b)
(c)
(d)
Rafflesia or Corpse flower is a total root parasite. It obtains the total nourishment from the roots of the host plant.
Q-2) In class of Amphibia, respiration occurs through
(a)
(b)
(c)
(d)
Q-3) The long bones are hollow and connected by air passages these are characteristics of
(a)
(b)
(c)
(d)
Hollow bones are characteristic adaptive features of birds. It reduces their body weight and is a major flight adaptation.
Q-4) Which of the following group of animals maintains high and constant body temperature such as mammals ?
(a)
(b)
(c)
(d)
Animals which maintain high and constant body temperature are called warm blooded animals. They are also called homeothermic animals. Birds are the first vertebrate to have warm blood. They are homeothermous.
Q-5) A dihybrid condition is
(a)
(b)
(c)
(d)
Dihybrid condition involves simultaneous inheritance of two pairs of mendelian factors or genes.
Q-6) The plant group that produces spores and embryo but lacks vascular tissues and seeds is
(a)
(b)
(c)
(d)
Bryophytes are the plants which produces spores and embryo but no vascular tissues are present, although primitive type of conducting tissues are present in the form of hadrome and leptome.
Q-7) Consider the following statements :
- The terms ‘gene’ and ‘allele’ were coined by Johansen.
- Chromosomal theory of inheritance was given by Sutton and Boveri.
- ‘One gene-one enzyme’ hypothesis was given by ‘Beadle and Tautum’.
Which of the statements given above are correct?
(a)
(b)
(c)
(d)
The Boveri–Sutton chromosome theory or Chromosomal theory of inheritance is a fundamental unifying theory of genetics which identifies chromosomes as carriers of genetic material.
One gene one protein hypothesis was given by Beadle and Tatum which was later outdated after the discovery of alternate splicing.
Q-8) Match List-I with List-II :
List-I
List-II
A. Discovery of transduction and conjugation
1. Khurana
B. Establishing the sex-linked inheritance
2. Kornberb
C. Isolation of DNA polymerase from E. coli
3. Lederberg
D. Establishing the complete genetic code
4. Morgan
Select the correct answer from the codes given below the lists: (A) (B) (C) (D)
| List-I | List-II |
| A. Discovery of transduction and conjugation | 1. Khurana |
| B. Establishing the sex-linked inheritance | 2. Kornberb |
| C. Isolation of DNA polymerase from E. coli | 3. Lederberg |
| D. Establishing the complete genetic code | 4. Morgan |
(a)
(b)
(c)
(d)
Q-9) Consider the following statements :
- Mirabilis is an exception to Mendel’s principle of dominance.
- Mendel’s second law is the law of segregation.
- Mendel’s law of independent assortment is based on F2 ratio of 9 : 3 : 3 1.
Which of the statement(s) given above is/are correct about Mendel’s law?
(a)
(b)
(c)
(d)
Incomplete dominance and Co-dominance are non-Mendelian genetic characteristics. Mendel’s second law is the law of independent assortment of segregation. It is based on the F2 ratio of 9 : 3 : 3 : 1
Q-10) Which of the following viruses have RNA as the genetic material? - Polio-viruses
- Retroviruses
- Adeno-viruses
- TMV
Choose the correct option from the codes given below :
(a)
(b)
(c)
(d)
Adenoviruses are medium-sized (90–100 nm), nonenveloped viruses with an icosahedral nucleocapsid containing a double stranded DNA genome.
Q-11) Artificial system of classification was first used by
(a)
(b)
(c)
(d)
Pliny the Edler introduced first artificial system of classification in his book Historia Naturalis.
Q-12) Sex-determination by environmental factors is commonly observed in
(a)
(b)
(c)
(d)
The Green Spoonworm (Bonellia viridis) is a marine worm noted for displaying exceptional sexual dimorphism due to environment factors.
Q-13) The branches of this tree root themselves like new trees over a large area. The roots then give rise to more trunks and branches. Because of this characteristic and its longevity, this tree is considered immortal and is an integral part of the myths and legends of India. Which tree is this?
(a)
(b)
(c)
(d)
Q-14) Binomial Nomenclature was given by
(a)
(b)
(c)
(d)
Q-15) The first organisms were
(a)
(b)
(c)
(d)
Chemoheterotrophs were first organisms. They were prokaryotic like bacteria, anaerobes, as molecular oxygen was absent. They obtained energy by fermentation of some of the organic molecules present in the broth. Thus they absorbed organic molecules from outside for body building and energy.
Chemoautotrophs - Organisms that are capable to synthesize organic molecules from inorganic molecules. E.g., Nitrifying bacteria, sulphur reducing bacteria etc.
Autotrophs are photosynthesizing plants / organisms.
Q-16) Which one of the following pairs of nitrogenous bases of nucleic acids, is wrongly matched with the category mentioned against it?
(a)
(b)
(c)
(d)
Purine is an organic nitrogenous base sparingly soluble in water, that gives rise to a group of biologically important derivatives, notably adenine and guanine, which occur in nucleotides and nucleic acids (DNA and RNA).
Q-17) Dinosaurs were in
(a)
(b)
(c)
(d)
Q-18) Homologous organs are
(a)
(b)
(c)
(d)
Organs that are similar in fundamental structure but different in functions are “homologous organs”, Richard Owen, introduced the term homologous. Pectoral fins of fish and fore limbs of horse similar in structure but different in functions are homologous organs. Rest of the organs compared in the question are analogous organs.
Q-19) The main factor of evolution is
(a)
(b)
(c)
(d)
Q-20) Who explained first the evolution of life?
(a)
(b)
(c)
(d)