NET, IAS, State-SET (KSET, WBSET, MPSET, etc.), GATE, CUET, Olympiads etc.: Botany MCQs (Practice_Test 39 of 104)
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- As per the international society of social science, what is the size of the particles of fine sand in the soil?
- 0.001 mm to 0.002 mm
- 0.002 mm to 0.02 mm
- 0.02 mm to 0.20 mm
- 0.20 mm to 2.00 mm
- With which of the following is the name of Louis Pasteur associated?
- Explanation of the formation of simple organic molecules in the early atmosphere of earth.
- The proposition of the composition of gases in the early atmosphere of earth.
- Disproving the theory of spontaneous generation of organisms.
- Proposition that the first photosyrhetic organisms were cyanobacteria.
- Assertion (A) : Ferreoxin carries two electrons at a time.
- Reason (R) : The active site of ferredoxin consists of two iron atoms bound to two sulfur atoms.
- Both A and R are individually true and R is the correct explanation of A.
- Both A and R are individually true but R is not the correct explanation of A.
- A is true but R is false
- A is false but R is true
- Assertion (A) : Rice seeds germinate and begin to grow under flooded conditions.
- Reason (R) : Embryos of rice seeds carry out facultative anaerobic respiration.
- Both A and R are individually true and R is the correct explanation of A.
- Both A and R are individually true but R is not the correct explanation of A.
- A is true but R is false
- A is false but R is true
- Assertion (A) : Citric acid has lesser Respiratory Quotient in comparison to lipids.
- Reason (R) : Citric acid has relatively more oxygen in comparison to lipids.
- Both A and R are individually true and R is the correct explanation of A.
- Both A and R are individually true but R is not the correct explanation of A.
- A is true but R is false
- A is false but R is true
- Assertion (A) : If the oat seedlings are exposed to unilateral illumination, the stem bends towards the light.
- Reason (R) : An auxin gradient is established in the coleoptile by the destruction of auxin in the lighted side and extra synthesis of auxin in the darker side.
- Both A and R are individually true and R is the correct explanation of A.
- Both A and R are individually true but R is not the correct explanation of A.
- A is true but R is false
- A is false but R is true
- Assertion (A) : In pear fruit, the inner tissue is the true fruit and the outer tissue is the accessory fruit.
- Reason (R) : In pear, the fruit develops from inferior Ovary.
- Both A and R are individually true and R is the correct explanation of A.
- Both A and R are individually true but R is not the correct explanation of A.
- A is true but R is false
- A is false but R is true
- Assertion (A) : The rate of DNA replication is much faster in E coil than in eukaryotes.
- Reason (R) : The length of Okazaki fragments that result from DNA Polymer I activity are much shorter in prokaryotes than in eukaryotes
- Both A and R are individually true and R is the correct explanation of A.
- Both A and R are individually true but R is not the correct explanation of A.
- A is true but R is false
- A is false but R is true
- Assertion (A) : Orchid seeds lack endosperm in flowering plants.
- Reason (R) : Double fertilization is absent in orchids.
- Both A and R are individually true and R is the correct explanation of A.
- Both A and R are individually true but R is not the correct explanation of A.
- A is true but R is false
- A is false but R is true
- Assertion (A) : Segemental allopolyploids where all the chromosomes are homologous.
- Reason (R) : Segmental allopolyploids can be identified by their meiotic behavior.
- Both A and R are individually true and R is the correct explanation of A.
- Both A and R are individually true but R is not the correct explanation of A.
- A is true but R is false
- A is false but R is true
- Assertion (A) : The expression of each gene is independent of the other genes.
- Reason (R) : Genes follow the law of independent assortment as per Mendel՚s studies.
- Both A and R are individually true and R is the correct explanation of A.
- Both A and R are individually true but R is not the correct explanation of A.
- A is true but R is false
- A is false but R is true
- Consider the following statements: In vitro micro propagation has the advantages of:
- Range of variability
- Year round availability
- Small size of explants
- Production of disease free prop gules.
- Which of the statements given above are correct?
- 1,2 and 4 only
- 2,3 and 4 only
- 1 and 3 only
- 1,2, 3 and 4
- Who of the following is associated with the discovery of ‘Restriction endow-nuclease’
- Hamilton Smith
- H. G. Khorana
- Marshall Nirenberg
- S. B. Weiss
- Consider the following diseases of plants:
- Root knot of sugar-cane.
- Root rot of wheat.
- Wilt of cotton.
- Angular leaf spot of cotton.
- Which of these diseases is/are caused by fungi?
- 1 and 4 only
- 2 only
- 2 and 3
- 1,3 and 4
- Which one of the following is a disease caused by zinc deficiency?
- Die back of rice
- Khaira disease of rice
- Black heart of potato
- Brown spot of rice