Which of the following materials is not a living semi-permeable membrane?
pig's bladder
Unripe pawpaw fruit
Yam tuber
Sheet of cellophane
Correct answer is D
A semipermeable membrane is a type of biological or synthetic, polymeric membrane that will allow certain molecules or ions to pass through it by osmosis. There are two examples of semi-permeable membrane, which are non-living and living semi-permeable membranes. Examples of non-living semi-permeable membranes that are permeable to water but not solvent e.g copper sulphate solution are visking tube, parchment, and cellophane.
The diagram below is an illustration of the longitudinal section of a plant organ. Study it and answer the question below.
apical bud
scale leaf
adventitious root
fleshy leaf
Correct answer is B
The scales of the onion bulb are actually modified leaves that provide protection from water loss.
The diagram below is an illustration of the longitudinal section of a plant organ. Study it and answer the question below.
stem tuber
bulb
stolon
runner
Correct answer is B
No explanation has been provided for this answer.
The diagram below is an illustration of the longitudinal section of a plant organ. Study to answer the question below.
Food is stored in the part labeled
I
II
III
IV
Correct answer is B
- An onion bulb is a type of plant storage organ.
- The bulbs are composed of shortened, compressed, underground stems surrounded by fleshy modified scale (leaves) that envelop a central bud at the tip of the stem.
The network of double membranes that conveys materials through the cytoplasm is the
plasma membrane
nuclear membrane
mitochondrion
endoplasmic reticulum
Correct answer is D
No explanation has been provided for this answer.
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