Santra Biology Class 12. We covered all the Santra Biology Class 12 MCQs in this post for free so that you can practice well for the exam.
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Santra Biology Class 12 Objective for Students
Organ system level of organization is observed in the:
(a) Chordates
(b) Annelids
(c) Mollusks
(d) All of these
Option d – All of these
The body cavity lined by mesoderm is called:
(a) Coelenteron
(b) Pseudocoel
(c) Coelom
(d) Blastocoel
Option c – Coelom
The response to external stimulus is maximally quicker and more precise in which of the following symmetries?
(a) Radial
(b) Bilateral
(c) Spherical
(d) Biradial
Option b – Bilateral
The notochord is derived from which of the following layers?
(a) Ectoderm
(b) Mesoderm
(c) Endoderm
(d) Placoderm
Option b – Mesoderm
The body having a meshwork of cells, internal cavities lined with food-filtering flagellated cells, and indirect development are characteristics of which phylum?
(a) Coelenterata
(b) Porifera
(c) Mollusca
(d) Protozoa
Option b – Porifera
In Phylum Porifera, the opening through which water leaves the spongocoel is called:
(a) Ostia
(b) Ommatidia
(c) Osculum
(d) Choanocytes
Option c – Osculum
Which one of the following is not a poriferan?
(a) Sycon
(b) Spirulina
(c) Euspongia
(d) Spongilla
Option b – Spirulina
Cells that are peculiar to Phylum Porifera are:
(a) Chimeras
(b) Chondrocytes
(c) Dendrocytes
(d) Choanocytes
Option d – Choanocytes
The skeletons of animals belonging to Phylum Porifera are made up of:
(a) Spicules
(b) Spiracles
(c) Spines
(d) Spongocytes
Option a – Spicules
Angiospermic plants are divided into:
(a) Dicot
(b) Monocot
(c) Both (a) and (b)
(d) Heartwood plants and sapwood plants
Option c – Both (a) and (b)
Eight nucleated female gametophyte is found in:
(a) Bryophytes
(b) Gymnosperms
(c) Angiosperms
(d) Pteridophytes
Option c – Angiosperms
Double fertilization occurs among:
(a) Algae
(b) Bryophytes
(c) Angiosperms
(d) Gymnosperms
Option c – Angiosperms
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