NET, IAS, State-SET (KSET, WBSET, MPSET, etc.), GATE, CUET, Olympiads etc.: Botany MCQs (Practice_Test 13 of 104)
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- The diagrams given below show population dispersion: Which of these illustrates clumped dispersion pattern in a Population? Select the correct answer using the codes given below:
- 2 and 3
- 3 and 5
- 3 and 4
- 1 and 5
- One of the main causes of the silting of big dams is
- Deforestation in the catchments area
- Increase in the population of wild animals in the forests around the dam
- Insufficient rainfall
- Excessive evaporation of water
- Common indicator organism of water pollution is
- Salmonella typhi
- Entamoeba histytic
- Vibrio cholerae
- Escherichia coli
- Which of the species given below indicate the higher salinity level of the soil?
- Prosopis juliflora
- Azadirachta indica
- Sueda fruticosa
- Chenopodium album
- Select the correct answer using the codes given below:
- 1 and 2
- 2 and 3
- 3 and 4
- 2 and 4
- Assertion (A) : In the leaves of gymnosperms the transfusion tissue is the only conducting tissue.
- Reason (R) : Scarcity of veins has led to the development of transfusion tissue in the leaves of gymnosperms
- Both A and Rare true and R is the correct explanation of A
- Both A and R are 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 prokaryotes, transcription and translation occur simultaneously, while in eukaryotes their occurrence is temporally and spatially separated.
- Reason (R) : In eukaryotes, transcription occurs in nucleus and the encoded message is translated in cytoplasm, but in prokaryotes there is no demarcation between cytoplasm and nudes having no nuclear membrane.
- Both A and Rare true and R is the correct explanation of A
- Both A and R are 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) : Phytochrome in green plans is different from phytochrome in etiolated tissues.
- Reason (R) : The form of phytochrome expressed in etiolated tissues is only of five gene products.
- Both A and Rare true and R is the correct explanation of A
- Both A and R are 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) : Apodictic seeds of a plant produce clonal population.
- Reason (R) : In apodictic plants, embryo is formed without meiosis and fertilization.
- Both A and Rare true and R is the correct explanation of A
- Both A and R are 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) : Mendel did not explain the phenomenon of linkage.
- Reason (R) : Factors (Genes) for all the seven characters in garden pea considered by Mendel were present in different homologous chromosomes.
- Both A and Rare true and R is the correct explanation of A
- Both A and R are 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) : Translocation heterozygote semisecret and are accompanied with multivalent association.
- Reason (R) : The gametes formed through alternate disjunction, are functional while those formed by adjacent disjunction are nonviable.
- Both A and Rare true and R is the correct explanation of A
- Both A and R are 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) : Frequency of crossing-over in chromosome is directly proportional to the distance between two genes.
- Reason (R) : Crossing-over at a point on a chromosome discourages the accidence of another crossing over in the vicinity.
- Both A and Rare true and R is the correct explanation of A
- Both A and R are 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 hypersensitive response (HR) occurs only in specific host-pathogen combination in which the host and pathogen are incompatible.
- Reason (R) : A resistant gene (R) recognizes and is triggered into action by the elicitor molecules released by the pathogen.
- Both A and Rare true and R is the correct explanation of A
- Both A and R are 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) : Jute fibers always occur in long wedge-shaped bundles outside the xylem.
- Reason (R) : Jute fibers always made up of phloem cells.
- Both A and Rare true and R is the correct explanation of A
- Both A and R are 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) : Deodar is one of the most proffered timber woods.
- Reason (R) : It is durable and has stability, resistance to temperature, insects and humidity.
- Both A and Rare true and R is the correct explanation of A
- Both A and R are true but R is NOT the correct explanation of A
- A is true but R is false
- A is false but R is true
- Which one of the following statements correctly defines Convergent evolution?
- The development of similar characters/states in different lineages that are related through a common ancestry
- The convergence of many characters/states in descents of the same lineage
- The development of similar characters/states in different lineages that are not directly related through a common ancestry
- The development of different characters/states in descendants of the same lineage