Solved: Draw a half-view of an animal-pollinated flower. Outline the growth of plant... [IB Biology]

Solved: Draw a half-view of an animal-pollinated flower. Outline the growth of plant... [IB Biology] | RevisionDojo

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Question

HLPaper 2

Draw a half-view of an animal-pollinated flower.

[4]

Verified

Solution

Sepals as outermost part of flower; 1 mark
Petals as largest part of flower; 1 mark
Stamen drawn with recognizable anther and filament
OR
Anther and filament shown as parts of the stamen; 1 mark
Carpel/pistil drawn with recognizable stigma, style, and ovary
OR
Stigma, style, and ovary shown as parts of the carpel; 1 mark
Nectary at base of the ovary; 1 mark
Ovule inside the ovary; 1 mark

Since the question does not specify a labelled half-view, allow some marks for unlabeled structures: award one mark for any two of the six structures in the mark scheme (mpa to mpf). It must be clear what each unlabeled part is. The maximum mark is therefore 3 for an unlabeled half-view.

[Max 4 Marks]

Outline the growth of plant shoot apex.

[4]

Verified

Solution

Growth in shoots is indeterminate/unlimited; 1 mark
Produces stem and leaves; 1 mark
(For mpb, both stem and leaves are needed and buds or branches should not be accepted as alternatives.)
Growth/cell growth/cell elongation controlled/affected by hormones/auxin/IAA; 1 mark
New/extra cells produced by mitosis/cell division / apex is a meristem; 1 mark
Tropism/phototropism / grows towards the sun/light; 1 mark
Auxin moved away from sunny side/to shady side of shoot «apex»
OR
Auxin efflux pumps set up concentration gradients; 1 mark

[Max 4 Marks]

Explain the movement of energy and inorganic nutrients in an ecosystem.

[7]

Verified

Solution

Autotrophs/producers/plants obtain inorganic nutrients from the «abiotic» environment; 1 mark
Energy is provided «mainly» by sunlight; 1 mark
Light energy is converted «to chemical energy» through photosynthesis; 1 mark
Photosynthesis/producers/autotrophs convert inorganic carbon/carbon dioxide and water into carbon/organic compounds; 1 mark
Organic compounds/glucose are used as a source of chemical energy «through respiration»; 1 mark
Organic compounds/glucose are used to synthesize other organic compounds; 1 mark
Organic compounds/glucose are used to synthesize ATP; 1 mark
Organic compounds/glucose are used for growth/repair/reproduction; 1 mark
Organic compounds/glucose are stored as starch/lipids; 1 mark
Organic compounds/glucose are passed on to other organisms in food chains; 1 mark

Award [5 max] if only energy is mentioned.

[Max 7 Marks]

Biology International Baccalaureate (IB) Practice Question: 1. Draw a half-view of an animal-pollinated flower. 2. Outline the growth of plant shoot apex. 3. Explain the movement...