41.

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

Seed coat is not thin, membranous in

• maize

• coconut

• groundnut

• gram

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