Select the correct statement with respect to locomotion in humans
A decreased level of progesterone causes osteoporosis in old people
Accumulation of uric acid crystals in joints causes their inflammation
The vertebral column has 10 thoracic vertebrae
The joint between adjacent vertebrae is a fibrous joint
The characteristics and an example of a synovial joint in humans is
Characteristics | Examples |
Fluid cartilage between two bones, limited movements | Knee joints |
Fluid filled between two joints, provides cushion | Skull bones |
Fluid filled synovial cavity between two bones | Joint between atlas and axis |
Lymph filled between two bones, limited movement | Gliding joint between carpals |
A diagram showing axon terminal and synapse is given. Identify correctly at least two of A-D
A - Receptor; C - Synaptic vesicles
B - Synaptic connection; D - K+
A - Neurotransmitter; B - Synaptic cleft
C - Neurotransmitter; D - Ca2+
Parts A, B, C and D of the human eyes are shown in the diagram. Select the option, which gives correct identification along with its functions/characteristics
A - retina - contains photoreceptors - rods and cones
B - blind spot - has only a few rods and cones
C - aqueous chamber - reflects the light, which does not pass through the lens
D - choroidits anterior part forms ciliary body
Which of the following statement is correct in relation to the endocrine system?
Adenohypophysis is under direct neural regulation of the hypothalamus
Organs in the body like gastrointestinal tract, heart, kidney and liver do not produce any hormones
Non- nutrient chemicals produced by the body in trace amount that act as intercellular messenger are known as hormones
Releasing and inhibitory hormones are produced by the pituitary gland
Select the answer which correctly matches the endocrine gland with the hormone it secretes and its function/deficiency symptom
Endocrine gland | Hormone | Function/ deficiency symptoms |
Anterior pituitary | Oxytocin | Stimulates uterus contraction during child birth |
Posterior pituitary | Growth Hormone (GH) | Oversecretion stimulates abnormal growth |
Thyroid gland | Thyroxine | Lack of iodine in diet results in goitre |
Corpus luteum | Testosterone | Stimulates spermatogenesis |
Megasporangium is equivalent to
embryo sac
fruit
nucellus
ovule
D.
ovule
An ovule or megasporangium generally has a single embryo sac formed from a megaspore through reduction division. It is a small structure attached to the placenta by means of a stalk called funicle.
Ovule Megaspore Mother Cell (MMC) by meiosis Megaspore
Each has one or two protective envelopes called integuments. Nucellus is a mass of cells enclosed with the integuments. Fruits develop from the ovary of flower, other floral parts degenerate and fall off.
Which one of the following statement is correct?
Hard outer layer of pollen is called intine
Sporogenous tissue is haploid
Endothecium produces the microspores
Tapetum nourishes the developing pollen
Product of sexual reproduction generally generates
longer viability of seeds
prolonged dormancy
new genetic combination leading to variation
large biomass