Biology Times (^19)
March
one pollen tube of the same species grows
into the style.
(b) Insect that consumes pollen or nectar without
bringing about pollination is called pollen /
nectar robber.
(c) Pollen germination and pollen tube growth
are regulated by chemical components of
pollen interacting with those of the pistil.
(d) Some reptiles have been reported as
pollinators in some plant species.
- A cell at telophase stage is observed by a
student in a plant brought from the field. He tells
his teacher that this cell is not like other cells at
telophase stage. There is no formation of cell plate
and thus the cell is containing more number of
chromosomes as compared to other dividing cells.
This would result in (NEET 2016)
(a) Somaclonal variation (b) Polyembrony
(c) Polyploids (d) Aneuploids - System of rotating crops with legume or grass
pasture to improve soil structure and fertility is cal
led (NEET 2016)
(a) strip farming (b) shifting agriculture
(c) ley farming (d) contour farming - Which of the following enhances or induces fusion
of protoplasts? (AIPMT 2015)
(a) Sodium chloride and potassium chloride
(b) Polyethylene glycol and sodium nitrate
(c) IAA and kinetin
(d) IAA and gibberellins - A technique of micropropagation is
(AIPMT 2015)
(a) Somatic hybridisation
(b) Somatic embryogenesis
(c) Protoplast fusion
(d) Embryo rescue
13.A protoplast is a cell (AIPMT 2015)
(a) Without cell wall
(b) Without plasma membrane
(c) Without nucleus
(d) Undergoing division
14.Outbreeding is an important strategy of animal
breeding because it: (AIPMT 2015)
(a) Exposes harmful recessive genes that are
eliminated by selection.
(b) Helps in accumulation of superior genes.
(c) It is useful in producing purelines of animals.
(d) It is useful in overcoming inbreeding depression. - Pollen tablets are available in market for
(AIPMT 2014)
(a) Breeding programmes
(b) Supplementing food
(c) Exsitu conservation
(d) Insitu conservation- In plant breeding programmes, the entire collection
of plants/seeds having all the diverse alleles for
alleles for all genes in a give ncrop is called
(AIPMT 2013)
(a) Selection of superior recombinants.
(b) Cross-hybridisation among the selected parents.
(c) Evaluation and selection of plants.
(d) Germplasm collection
17.Green revolution in India occurred during;
(AIPMT 2012)
(a) 1950’s (b) 1960’s
(c) 1970’s (d) 1980’s - Consider the following 4 statements (A-D) and
select the option which includes all the correct
ones only: (AIPMT 2012)
A. Single cell Spirulina can produce large
quantities of food rich in Protein, Minerals, and
Vitamins etc.
B. Body weight-wise the microorganism
Methylophilus methylotrophus may be able
to produce several times more proteins than
the cows per day.
C. Common button mushrooms are a very rich
source of vitamin C.
D. A rice variety has been developed which is
very rich in Calcium.
(a) Statements A, B (b) Statements C, D
(c) Statements A, C, D (d) Statements B, C, D - Plants like Sunflower, Brassica, apple and pears
are generally pollinated by (AIPMT 2012)
(a) Wind (b) Bees
(c) Butterflies (d) Birds - Polyethylene glycol is used for (AIPMT 2009)
(a) Biodiesel production.
(b) Seedless fruit production.
(c) Energy production from sewage.
(d) Gene transfer without a vector.
21.Which of the following pairs of animals comprises
jawless fishes? (AIPMT 2008)
(a) Mackerels and Rohu
(b) Lampreys and Hag fishes
(c) Guppies and Hag fishes
(d) Lampreys and Eels
22.Consider the following four measures (A-D) that
could be taken successfully grow chick pea in an
area where bacterial bright disease is common