Parts A,B,C and D of the human eye are shown in the diagram. Select the option which gives correct identification along with its functions/characteristics:
D - Choroid - its anterior part forms ciliary body.
A - Retina - contains photo receptors - 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.
Which of the following statements is correct in relation to the endocrine system?
Releasing and inhibitory hormones are produced by the pituitary gland.
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.
Figure shows human urinary system with structures labelled A to D. Select option which correctly identifies them and gives their characteristics and/or functions.
D - Cortex - outer part of kidney and do not contain any part of nephrons.
A - Adrenal gland - located at the anterior part of kidney. Secrete Catecholamines which stimulate glycogen breakdown.
B - Pelvis - broad funnel shaped space inner to hilum, directly connected to loops of Henle.
C - Medulla - inner zone of kidney and contains complete nephrons.
Figure shows schematic plan of blood circulation in humans with labels A to D. Identify the label and give its function/s.
D - Dorsal aorta - takes blood from heart to body parts, PO2 = 95 mm Hg
A - Pulmonary vein - takes impure blood from body parts, PO2 = 60 mm Hg
B- Pulmonary artery -takes blood from heart to lungs, PO2 = 90 mm Hg
C - Vena Cava - takes blood from body parts to right auricle, PCO2 = 45 mm Hg
Which of the following criteria does not pertain to facilitated transport?
Requirement of special membrane proteins
The first stable product of fixation of atmospheric nitrogen in leguminous plants is:
Lenticels are involved in:
During seed germination its stored food is mobilized by:
What external changes are visible after the last moult of a cockroach nymph?
Mandibles become harder
Anal cerci develop
Both fore wings and hind wings develop
Interfascicular cambium develops from the cells of:
In china rose the flowers are:
Zygomorphic, epigynous with twisted aestivation
Actinomorphic, hypogynous with twisted aestivation
Actinomorphic, epigynous with valvate aestivation
Zygomorphic, hypogynous with imbricate aestivation
Which one of the following statements is correct?
Tapetum nourishes the developing pollen
Hard outer layer of pollen is called intine
Sporogenous tissue is haploid
Endothecium produces the microspores
Which one of the following is not the function of placenta ? It:
secretes oxytocin during parturition.
facilitates supply of oxygen and nutrients to embryo.
facilitates removal of carbon dioxide and waste material from embryo.
What is the correct sequence of sperm formation?
Spermatogonia, spermatocyte, spermatid, spermatozoa
Spermatid, spermatocyte, spermatogonia, spermatozoa
Spermatogonia, spermatocyte, spermatozoa, spermatid
Spermatogonia, spermatozoa, spermatocyte, spermatid
Product of sexual reproduction generally generates:
Longer viability of seeds
New genetic combination leading to variation
One of the legal methods of birth control is:
by a premature ejaculation during coitus
abortion by taking an appropriate medicine
by abstaining from coitus from day 10 to 17 of the menstrual cycle
by having coitus at the time of day break
Menstrual flow occurs due to lack of:
Megasporangium is equivalent to:
Artificial insemination means:
introduction of sperms of a healthy donor directly into the ovary
transfer of sperms of a healthy donor to a test tube containing ova
transfer of sperms of husband to a test tube containing ova
artificial introduction of sperms of a healthy donor into the vagina
Advantage of cleistogamy is:
Higher genetic variability
More vigorous offspring
No dependence on pollinators