The heart of the human embryo starts beating in the _____ week of its development.
second
third
fourth
first
Correct Answer :
B. third
Related Questions
The golden age of Dinosaurs was
Palaezoic
Cenozoic
Mesozoic
Proterozoic
The plants will stop growing if the shoot tip is cut off because
shoot tip produces growth hormones
shoot tip contains meristematic cells
shoot tip is the growing part
the plant dies
Hypogeal germination is found in
castor
onion
bean
bengal gram
The development of new organs is termed
Parthenogenesis
Morphogenesis
Histogenesis
Paedogenesis
The grouping of blood is based on substances called
antibodies
antigens
antitoxin
enzymes
Memory is the responsibility of
cerebrum
cerebellum
medulla oblongata
spinal cord
Lamarck's theory of inheritance of acquired characters was challenged by
August Weismann
Hugo de Vries
Herbert- Spencer
Carl Linnaeus
Which one of the endocrine glands disappears after puberty?
Thyroid
Thymus
Adrenals
Pituitary
Cancer is induced by certain viruses called
poxviruses
adenoviruses
oncogenic viruses
herpesviruses
Which among the following is a balanced fertiliser for plants?
Urea
Ammonium Sulphate
Nitrates
Compost
The germ theory of diseases was put forward by
Louis Pasteur
Luister
Leuwenhoek
Flemming
The hormone that is responsible for secondary sexual character in the male is
oestrogen
progesterone
testosterone
prolactin
Blood plasma from which fibrinogen is removed is known as
serum
blood concentrate
lymph
antibody component
Scurvy is a disease caused by the deficiency of vitamin.
A
B
C
D
Stripes on the bodies of animals Indicate
mating habit
food habit
cave dwelling
matching of skin colour with the surroundings
The theory that all animals and plants are made up of cells and they could arise only from pre-existing cells was propounded by
Robert Hooke
Matthias Schleiden and Theodore Schwann
Purkinije
Leuwenhoek
In plants water is carried upwards by
phloem
paranchyma
xylem
meristem
Green plants In the sea are useful for respiration of flash because they
release oxygen
release carbon dioxide
release oxygen and carbon dioxide simultaneously
take oxygen and give out carbon dioxide
Dialysis is used when there is a failure of
heart
lungs
liver
kidneys
Rh+ blood is due to genes which are
dominant
recessive
codominant
neutral
Which of the following diseases is caused by the deficiency of iron in human body?
Anaemia
Scurvy
Dermatosis
None of these
Animals that feed only on dead flesh are
herbivorous
carnivorous
omnivorous
carrion-eaters
Modern classification of the living world recognise ___________ kingdoms.
two
three
four
five
The energy for the sperm to swim and reach the egg is provided by
tail
head
neck
mitochondria
The blood pressure is controlled by the hormone
Vasopressin
Oxytocin
Oestrogen
Testasterone
The animal that excretes uric acid
Monkey
Lizard
Mouse
Elephant
The age of a tree can be determined by
counting the number of annual rings
thickness of the bark
the bulk of the tree
the number of leaves
Organisms that depend only on raw plant products are said to be
herbivorous
vegetarian
carnivorous
omnivorous
The natural defence of our body against foreign germs is formed by
red corpuscles
white corpuscles
platelets
lymph
When one gene controls two or more different characters simultaneously, the phenomenon is called
Apomixis
Pleiotropy
Polyploidy
Polyteny