CBSE Class 10 Science Gk Questions & Answers

CBSE Class 10 Science Gk Questions & Answers CBSE Class 10 Science QUESTIONS

CBSE Class 10 Science Gk Questions & Answers

11 Which of the following radiations is responsible for the conversion of atmospheric oxygen to ozone?
A Infrared radiations
B Ultraviolet radiations
C Gamma radiations
D Cosmic radiations

Answer: Ultraviolet radiations
12 Which among the following is a correct full form for DDT?
A Dichlorodiphenyltrichloroethane
B Dichlorodiethyltrichloroethane
C Dichlorodiphenyltetrachloroethane
D None of these

Answer: Dichlorodiphenyltrichloroethane
13 The process of accumulation of harmful chemical substances like pesticides, in the body of living organisms at each trophic level of a food chain is known as:
A Chemical magnification
B Biological accumulation
C Biological magnification
D None of these

Answer: Biological magnification
14 Green plants utilize ……… percent of sun’s energy to prepare their food by the process of photosynthesis?
A 99 percent
B 1 percent
C 10 percent
D 20 percent

Answer: 1 percent
15 In a food chain the second trophic level is occupied by:
A Herbivores
B Producers
C Carnivores
D Autotrophs

Answer: Herbivores
16 Which among the following statements is incorrect in view of the plants?
A They convert the solar energy into mechanical energy
B They prepare their food from organic compounds
C They are also called producers
D They are the initial source of energy in a food chain

Answer: They prepare their food from organic compounds
17 The number of chromosomes in both parents and offsprings of a particular species remains constant because:
A Chromosomes get halved after gamete formation
B Chromosomes get halved during gamete formation
C Chromosomes get doubled after zygote formation
D Chromosomes get doubled after gamete formation

Answer: Chromosomes get halved during gamete formation
18 The number of chromosomes in parents and offsprings of a particular species remains constant due to:
A Halving of chromosomes after gamete formation
B Doubling of chromosomes after zygote formation
C Doubling of chromosomes after gamete formation
D Halving of chromosomes during gamete formation

Answer: Halving of chromosomes during gamete formation
19 The asexual reproduction in the Spirogyra involves:
A Division of a cell into many cells
B Formation of a large number of buds
C Division of a cell into two cells
D Breaking up of filaments into smaller bits

Answer: Division of a cell into many cells
20 Which among the following is a unicellular organism that reproduces by budding:
A Spirogyra
B Yeast
C Hydra
D Planaria

Answer: Spirogyra

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