Importing better varieties and plants from outside and acclimatising them to local environment is called :
a.
Selection
b.
Cloning
c.
Introduction
Correct Answer
d.
Heterosis
Step-by-Step AI Explanation
Verified Method
The process of introducing plants from an outside geographical area to a new environment is known as Plant Introduction. Selection involves choosing superior genotypes from a population; Cloning refers to asexual multiplication; Heterosis is hybrid vigor. Thus, Introduction is the correct term.
Q2mcq1 mark
A plant called ‘X’ possesses small flower with reduced perianth and versatile anther. The probable agent for pollination would be :
a.
butterfly
b.
water
c.
beetles
d.
air
Correct Answer
Step-by-Step AI Explanation
Verified Method
Anemophily (pollination by air) is characterized by small, inconspicuous flowers, reduced perianth (to avoid obstruction), and versatile anthers that can sway freely to release pollen into the wind. Butterfly and beetle-pollinated flowers are usually large and showy. Water pollination typically involves submerged or floating hydrophytes, not versatile anthers.
Q3mcq1 mark
The bacteria, which possess Ti plasmid is :
a.
Arthrobacter luteus
b.
E. coli
c.
Bacillus amyloliquefaciens
d.
Agrobacterium tumifaciens
Correct Answer
Step-by-Step AI Explanation
Verified Method
Agrobacterium tumifaciens is a soil bacterium that naturally transfers a segment of its Ti (tumor-inducing) plasmid into host plant cells, making it a vital tool in plant genetic engineering. The other bacteria listed do not possess the Ti plasmid.
Q4mcq1 mark
Tamarindus indica is indigenous to :
a.
South America, Greece
b.
Tropical African region
Correct Answer
c.
India alone
d.
South India, Sri Lanka
Step-by-Step AI Explanation
Verified Method
Tamarindus indica, despite being commonly found in India today, is botanically considered to be indigenous to the Tropical African region.
Q5mcq1 mark
Which one of the following palindromic base sequence in DNA can be easily cut at about the middle by some particular restriction enzymes ?
a.
5’ GAATTC 3’ 3’ CTTAAG 5’
Correct Answer
b.
5’ CGTTCG 3’ 3’ ATCGTA 5’
c.
5’ CACGTA 3’ 3’ CTCAGT 5’
d.
5’ GATATG 3’ 3’ CTACTA 5’
Step-by-Step AI Explanation
Verified Method
A palindromic sequence reads the same on both strands in the 5' to 3' direction. Option A (5'-GAATTC-3') is the recognition site for the restriction enzyme EcoRI. Its complement, 3'-CTTAAG-5', is the exact reverse, forming a standard palindrome. The other options are not palindromic sequences.
Q6mcq1 mark
The only cereal that has originated and domesticated from the New World.
a.
Triticum duram
b.
Oryza sativa
c.
Zea mays
Correct Answer
d.
Triticum aestivum
Step-by-Step AI Explanation
Verified Method
Zea mays (Maize) originated in the New World (Central America/Mexico). Triticum species (wheat) and Oryza sativa (rice) originated in the Old World (Fertile Crescent and Asia respectively).
Q7mcq1 mark
Virus free plants are developed from :
a.
Protoplast culture
b.
Organ culture
c.
Cell Suspension culture
d.
Meristem culture
Correct Answer
Step-by-Step AI Explanation
Verified Method
The shoot apical meristem is usually free from viral infection because viruses are unable to replicate efficiently in rapidly dividing meristematic cells due to high metabolic activity and lack of vascular connection. Thus, meristem culture is used to produce virus-free plants.
Q8mcq1 mark
“Gametes are never hybrid”. This statement is associated with the :
a.
Law of segregation
Correct Answer
b.
Law of dominance
c.
Law of random fertilization
d.
Law of independent assortment
Step-by-Step AI Explanation
Verified Method
The Law of Segregation (Mendel’s First Law) states that alleles of a gene pair separate during gamete formation so that each gamete carries only one allele. Therefore, gametes are 'pure' and never hybrid for a trait, even if the parent is heterozygous.
Q9mcq1 mark
Solar energy used by green plants for photosynthesis is only :
a.
3 - 10%
b.
2 - 8%
c.
2 - 9%
d.
2 - 10%
Correct Answer
Step-by-Step AI Explanation
Verified Method
Plants capture only a small fraction of the solar energy reaching the Earth. Research indicates that green plants utilize approximately 2-10% of incident solar radiation for photosynthesis, while the rest is reflected, transmitted, or converted to heat.
Q10mcq1 mark
Which one of the following soil water is available for plants ?
a.
Capillary Water
Correct Answer
b.
Gravitational Water
c.
Hygroscopic Water
d.
Chemically bound Water
Step-by-Step AI Explanation
Verified Method
Capillary water is the water held in the soil pores by surface tension against the force of gravity. It is the only form of soil water that is readily available for absorption by plant roots. Gravitational water drains away, hygroscopic water is tightly held by soil particles, and chemically bound water is part of the soil mineral structure.
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Match List - I with List - II : List - I List - II (1)A pair of chromosomes extra with diploid (i)monosomy (2)One chromosome extra to the diploid (ii)tetrasomy (3)One chromosome loses from diploid (iii)trisomy (4)Two individual chromosomes loses from diploid (iv)double monosomy
a.
(1)-(ii), (2)-(iii), (3)-(i), (4)-(iv)
b.
(1)-(i), (2)-(iii), (3)-(ii), (4)-(iv)
c.
(1)-(iii), (2)-(ii), (3)-(i), (4)-(iv)
d.
(1)-(ii), (2)-(iii), (3)-(iv), (4)-(i)
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