A change in the amount of yolk and its distribution in the egg will effect
formation of a zygote
the pattern of cleavage
number of blastomeres produced
number of blastomeres produced
B.
the pattern of cleavage
The mode of cleavage is determined by the amount of yolk and its distribution.
(I) Holoblastic - The cleavage, in which the segmentation lines pass through the entire egg, dividing it completely, eg, frog, human egg, etc.
(II) Meroblastic -The lines of segmentation do not completely pass through the egg and remain confined to a part of the egg, eg , insects, birds, reptiles.
Which one onf the following groups of animals is bilaterally symmetrical and triploblastic?
Coelenterates (cnidarians)
Aschelminthes (roundworms)
ctenophores
ctenophores
The epithelial tissue present on the inner surface of bronchioles and fallopian tubes is
cuboidal
glandular
ciliated
ciliated
Which one of the following has haplontic life cycle?
Funaria
Polytrichum
fully developed foetus and placenta
fully developed foetus and placenta
Uric acid is the chief nitrogenous component of the excretory products of
man
earthworm
cockroach
cockroach
Stroma in the chloroplasts of higher plants contains
light -independent reaction enzymes
Light -dependent reaction enzymes
ribosomes
ribosomes
The correct sequence of plants in a hydrosere is
Oak → Lantana → scirpus→Pistia→Hydrilla→Volvox
Volvox → Hydrilla → Pistia → Scirpus → Lantana → Oak
Pista → Volvox → Scirpus → Hydrilla → Oak → Lantana
Pista → Volvox → Scirpus → Hydrilla → Oak → Lantana
Which one of the following pairs of food components in humans reaches the stomach totally undigested?
Protein and starch
Starch and fat
Fat and cellulose
Fat and cellulose
