Multiple Choice QuestionsWhen a neurone is a resting state, ie, not conducting any impulse, the axonal membrane is
equally permeable to both Na+ and K+ ions
impermeable to both Na+ and K+ ions
comparatively more permeable to K+ ions and nearly impermeable to Na+ ions
comparatively more permeable to K+ ions and nearly impermeable to Na+ ions
The cork cambium, cork and secondary cortex are collectively called
Phellogen
Periderm
phellem
phellem
The curve given below shows enzymatic activity with relation to three conditions (pH, temperature and substrate concentration)
What do the two axises (X and Y) represent?
|
X –axis |
Y-axis |
|
Temperature |
Enzyme activity |
|
X –axis |
Y-axis |
|
Substrate concentration |
enzymatic activity |
|
X –axis |
Y-axis |
|
enzymatic activity |
temperature |
|
X –axis |
Y-axis |
|
enzymatic activity |
temperature |
Uricotelic mode of passing out nitrogenous wastes is found in
birds and annelids
amphibians and reptiles
insects and amphibians
insects and amphibians
|
Gland |
Secretion |
Effect on Body |
|
A |
Oestrogen |
Maintenance of secondary sexual characters |
|
Alpha cells of islets of Langerhans |
B |
Raise blood sugar level |
|
Anterior pi- tuitary |
C |
Over secretion leads to gigantism |
|
A |
B |
C |
|
Placenta |
Insulin |
Vasopressin |
|
A |
B |
C |
|
Ovary |
Insulin | Calcitonin |
|
A |
B |
C |
|
Placenta |
Glucagon |
Calcitonin |
|
A |
B |
C |
|
Placenta |
Glucagon |
Calcitonin |
D.
|
A |
B |
C |
|
Placenta |
Glucagon |
Calcitonin |
The ovary is the primary female sex organ that produces the female gamete (ovum) and several steroid hormones (ovarian hormones). The two steroid hormones produced by ovary are oestrogen and progesterone. Oestrogens produced by ovary are oestrogen and progesterone. Oestrogens produce wide-ranging actions such as stimulation of growth and activities of females secondary sex organs, development of growing ovarian follicles, appearance of female secondary sex characters (e.g., high pitch of voice, etc.) mammary gland development oestrogens also regulate female sexual behaviour.
Alpha cells of islets of Langerhans of the endocrine pancreas secrete a hormone called glucagon. It is a peptide hormone and plays an important role in maintaining the normal blood glucose levels. It acts mainly on the liver cells (hepatocytes) and stimulates glycogenolysis resulting in an increased blood sugar (hyperglycemia). In addition, this hormone stimulates the process of gluconeogenesis which reduces the cellular glucose uptake and utilisation. Thus, glucagon is a hyperglycemic hormone.
The pars distalis region of pituitary commonly called produced anterior pituitary, Growth Hormone (GH), prolactin (PRL), Thyroid-stimulating Hormone (TSH) Adrenocorticotrophic Hormone (ACTH), Luteinizing hormone (LH) and follicle-stimulating hormone (FSH). Over secretion of GH stimulates the abnormal growth of the body leading to gigantism and low secretion of GH results in stunted growth resulting in pituitary dwarfism.
One very special feature in the earthworm pheretima is that
the typhlosole greatly increases the effective absorption area of the digested food in the intestine
the S- shaped setae embedded in the integument are the defensive weapons used against the enemies
It has a long dorsal tubular heart
It has a long dorsal tubular heart
Which one of the following is wrongly matched?
Puccinia - Smut
Root - Exarch protoxylem
Cassia - Imbricate aestivation
Cassia - Imbricate aestivation
Which one of the following statements is correct with respect to kidney function regulation?
Exposure to cold temperature stimulates ADH release
An increase in glomerular blood flow stimulates formation of angiotensin II
During summer when body loses lot of water by evaporation, the release of ADH is suppressed
During summer when body loses lot of water by evaporation, the release of ADH is suppressed
A prokaryoticv autotrophic nitrogen-fixing symbiont is found in
Cycas
Cicer
Pisum
Pisum
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