Which one of the following statements about all the four of Spongilla, leech, dolphin and penguin is correct?
Penguin is homoiothermic while the remaining three are poikilothermic
Leech is a fresh water from while all other are marine
Spongilla has special collared cells called choanocytes, not found in the remaining three
Spongilla has special collared cells called choanocytes, not found in the remaining three
C.
Spongilla has special collared cells called choanocytes, not found in the remaining three
Spongilla belongs to phylum- Porifera, in which, choanocytes are the characteristic cells, these are absent in leech, dolphin and penguin. These distinctive cells line the interior body walls of sponges. These cells have a central flagellum that is surrounded by a collar of microvilli Choanocytes are versatile cells. Their flagella beat to create the active pumping of water through the sponge, while the collars of choanocytes are the primary area where nutrients absorbed into the sponge.
Toxic agents present in food which interfere with thyroxine synthesis lead to the development of
toxic goitre
cretinism
simple goitre
simple goitre
Which one of the following statements about certainly given animals is correct?
Roundworms (Aschelminthes) are pseudocoelomates
Molluscs are acoelomates
insects are pseudocoelomates
insects are pseudocoelomates
Which one of the following is not a lateral meristem?
Intrafascicular cambium
interfascicular cambium
Phellogen
Phellogen
Which one of the following kinds of animals are tribalistic?
Flatworms
Sponges
Ctenophores
Ctenophores
The energy -releasing metabolic process in which substrate is oxidised without an external electron acceptor is called
glycolysis
fermentation
aerobic respiration
aerobic respiration
If for some reason our goblet cells are non -functional, this will adversely effect
Production of somatostatin
secretion of sebum from the sebaceous glands
maturation of sperms
maturation of sperms
The plasma membrane consist mainly of
phospholipids embedded in a protein bilayer
Proteins embedded in a phospholipid bilayer
proteins embedded in a polymer of glucose molecules
proteins embedded in a polymer of glucose molecules
Carrier ions like Na+ facilitate the absorption of substance like
amino acids and glucose
glucose and fatty acids
fatty acids and glycerol
fatty acids and glycerol
The scutellum observed in a grain of Wheat or maize is comparable to which part of the seed in other monocotyledons?
Cotyledon
Endosperm
Aleurone layer
Aleurone layer
