Biology - Online Test
Q1. Which of the following is not correct about artificial means of vegetative propagation
Answer : Option B
Explaination / Solution:
During vegetative propagation, new organisms are formed by single plant parts. So, new individuals are genetically similar to each other and there is no genetic variation.
Q2. The scientist who put price tag of US$ 33 trillion a year for nature’s life-support services was
Answer : Option C
Explaination / Solution:
Robert Costanza is the director and founder of the Gund Institute for Ecological Economics at the University of Vermont, and cofounder of the International Society for Ecological Economics.
In 1997, Costanza and his colleagues made news headlines around the world with a paper, published in the British journal Nature, that estimated the annual net worth of the biosphere: $33 trillion, a figure greater than the annual gross national products (GNP) of all the world’s economies combined.
Q3. The upright posture in humans is facilitated by :
Answer : Option D
Explaination / Solution:
The upright posture in human is facilitated by massive hind limbs bones that makes broad feet and pelvis to with hold the weight of whole body.
Q4. Dolly sheep was produced due to property of the cells called as
Answer : Option D
Explaination / Solution:
The cells of embryo are totipotent that means that they have ability to produce whole new organism form single cell. Dolly sheep was produced due to property of totipotency.
Q5. The percentage of ratio of natality over mortality is called
Answer : Option B
Explaination / Solution:
Natality is the total number of new population added into existing population by birth on the other hand mortality means no of death in a particular geographical area or population. The ratio of natality and mortality is called vital index.
Q6. The correct order for instrument used for measuring stomatal size, atmospheric pressure and osmosis is
Answer : Option A
Explaination / Solution:
Porometer is used to measure stomatal size, monometer is used to measure atmospheric pressure and osmometer is used to measure osmosis.
Q7. A normal adult man and woman have ---------WBC per cubic millimetre.
Answer : Option B
Explaination / Solution:
A normal adult male and female have about 4.5 to 5 million of WBC per cubic millimeterof blood. The number of white blood cells increases during infection against pathogens.
Q8. Which one is not a member of kingdom Protista?
Answer : Option C
Explaination / Solution:
Kingdom Protista includes unicellular, eukaryotic organisms only. Phycomycetes is a subdivision of fungus which are multicellular. Protozoa, slime molds and euglenoids are part of kingdom Protista.
Q9. The fertilisation in which male gametes are carried through pollen tube is called as
Answer : Option D
Explaination / Solution:
Pollen grain lands on stigma for pollination. The pollen grain germinates and moves towards egg through pollen tube. This male and female gamete fusion is called siphonogamy.
Q10. Mediterranean orchid Ophrysensures pollination by
Answer : Option C
Explaination / Solution:
Mediterranean orchid Ophrys ensures pollination by co-evolution, sexual deceit and pseudo-copulation. One petal of flower bears an uncanny resemblance to female of bee in size, colour and markings.
