Botany
Double fertilization means the fusion of:
A.
Two male gametes with egg
B.
One male gametes with egg and other with synergid
C.
One male gametes with egg and other with secondary nucleus
D.
One male gametes with egg and other with the antipodal cell
A few organism are known to grow and multiply in temperature of 100-105˚C:
A.
Thermophilic subaerial fungi
B.
Marine archaebacteria
C.
Thermophilic sulphur bacteria
D.
Hot spring blue-green algae
Plants growing in extreme cold soil are:
A.
Oxylophytes
B.
Halophytes
C.
Psychrophytes
D.
Psammophytes
Coleoptile in grass seeding is:
A.
Radicle
B.
Plumule
C.
Cotyledon
D.
Sheath around emerging leaf
If the leaf cells of a lilly plant contain 2X number of chromosomes, its endosperm will have:
A.
X chromosomes
B.
2X chromosomes
C.
3X chromosomes
D.
6X chromosomes
During meiosis crossing over occurs at:
A.
Diplotene
B.
Leptotene
C.
Diakenesis
D.
Packytene
The number of meiotic division necessary to produce 1000 pollen grains is:
A.
200
B.
250
C.
500
D.
1000
The longest phase of meiosis is:
A.
Prophase I
B.
Prophase II
C.
Metaphase I
D.
Metaphase II
Resin canals are found in:
A.
Cycas
B.
Pinus
C.
Lycopodium
D.
Selaginella
Catkin inflorescence is found in:
A.
Fig
B.
Sunflower
C.
Mulberry
D.
Wheat
Parallel venation is characteristic of:
A.
Pea
B.
Banyan
C.
Grasses
D.
Shoe flower
In 'Opuntia, the function of photosynthesis is carried out by:
A.
Cladode
B.
Phyllode
C.
Phylloclade
D.
Stipules
Which is the most stable ecosystem?
A.
Mountain
B.
Desert
C.
Forest
D.
Ocean
Energy enters in ecosystem through:
A.
Herbivores
B.
Carnivores
C.
Producers
D.
Decomposers
Insectivorous plant grow only in soils deficient in:
A.
Calcium
B.
Nitrogen
C.
Copper
D.
Phosphorus
Etiolated plangs are characterized by:
A.
Pale yellow colouration
B.
Absence of chlorophyll
C.
Absence of carotenolds
D.
All of these
Morus alba is used to make:
A.
Furniture
B.
Foot ball
C.
Hockey sticks
D.
Hair oil
Ethnobotany deals with direct relationship of:
A.
Plant and animals
B.
Plants and people
C.
Plants and shrubs
D.
Herbs and shrubs
Cellulose is used in making:
A.
Cotton
B.
Gas
C.
Diesel
D.
Both 'A' and 'C'
Restriction enzyme was discovered by:
A.
Waksman
B.
Alexander Fleming
C.
Berg
D.
Smith and Nathans
Pasteurized milk is:
A.
Sterile and will not turn sour
B.
Free from pathogenic bacteria
C.
Not free from bacteria
D.
Rich in protein
Somaclonal variation can be obtained by:
A.
Application of colchicine
B.
Irradiation with gamma rays
C.
Tissue Culture
D.
Hybridization
Cultivation of Bt cotton has been much in the news. The prefix Bt means:
A.
Barium-treated' cotton seeds
B.
bigger thread' variety of cotton with better tensile strength
C.
Produced by 'biotechnology' using restriction enzymes and ligases
D.
Carrying an endotoxin gene from Bacillus thuringiensis
Which of the following oils is not obtained from plant sources?
A.
Essential oil
B.
Fatty oil
C.
Mineral oil
D.
Vegetable oil
Soil-less cultivation of plants is called:
A.
Sand culture
B.
Plastochron
C.
Phytochron
D.
Hydroponic