Biological control is to check growth of
plants
animals
weeds
one pest by another
Correct Answer :
D. one pest by another
Related Questions
Blood clot Inside blood vessels is prevented by
heparin
fibrinogen
thrombin
prothrombin
Insulin is produced in the human body by the
Heart
Kidney
Liver
Pancreas
The most accepted theory of the origin of earth is the fiery origin which was propounded by
Laplace
Chamberlain
James Jean
Hoyle
The cell theory of Schleiden and Schwann states that
cells reproduce by mitosis or meiosis
all cells have nuclei
cells are basic units of plants and animals
cells arise only from pre-existing cells
Which among the following vitamins is considered to be a harmone?
A
B
C
D
Wallace's line is a line
drawn by Darwin
across the mountains
between two zoo-geographical areas
between different classes of animals
The buffer substance in blood is
Calcium carbonate
Carbon dioxide
Sodium bicarbonate
Ammonia
Haemophilia is a hereditary disease carried by
females and expressed by females
females and expressed by males
males and expressed by females
males and expressed by males
Phonoreceptor refers to the perception of
light
sound
touch
smell
The counting of RBC's can be performed by
Haemocytometer
Haemoglobinometer
Clinostat
Thermometer
Spiders can take only
solid food
liquid food
plant juice
flesh of dead animals
Which of the following plays an important part in photosynthesis?
Chloroplast
Centrosome
Tonoplast
Nematoblast
Excess of amino-acids are broken down to form urea in the
Liver
Kidney
Spleen
Rectum
The muscles of the heart are
striated and involuntary
striated and voluntary
smooth and involuntary
smooth and voluntary
The layer of stagnant water in which light penetrates is called
Aphotic
Euphotic
Epilimnion
Disphotic
Which one is a water-soluble vitamin?
A
C
D
E
The study of heart is called
haematology
cardiology
pathology
nephrology
Agroecology relates
crops and productivity
crops and environment
crop productivity and physiology
crop resistance to climatic changes
The oldest era is
Palaeozoic
Mesozoic
Cenozoic
Proterozoic
Which of the following terms is used in Botany?
Recession
Dumping
Barter System
Biennial
The counting of RBCs is done with
haemocytometer
haemoglobinometer
clinostat
thermometer
1 gm of carbohydrate gives energy which is about
3 k cal
2 k cal
4.2 k cal
8.1 k cal
Plague is caused by
Bacteria
Virus
Fungus
Fleas
The bone cells are connected with each other by
Haversian canal
canaliculi
capillaries
matrix
The function of a cell wall is
to give definite shape to the cell
to provide mechanical strength and protection to the cell
to prevent the cell from desiccation
All the above
The cortex of human brain normally consists of
five billion, two hundred million cells
nine billion, two hundred million cells
six billion, two hundred million cells
eight billion, two hundred million cells
Nucleus was first discovered by
Porter
Robert Brown
Palade
None of these
The pigment which is responsible for blood clotting is
Fibrinogen
Haemoglobin
Glucose
Blood cells
Dr Khorana's work relates to
synthesis of simple DNA
genetic code
reduction of mutation
synthesis of RNA from bacterial cell
Which of the following diseases is considered as completely eradicated from India, as no case of the same has been reported in last one year?
Polio
Tuberculosis
Cancer
Swine flu