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Kerala DHSE Plus One Environmental Science — practice by topic

Browse 23 questions across 1 Environmental Science topics. Choose what you want to revise, then open a question to check its answer and worked solution.

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Environmental Science topics

Unit 2A: Ecosystem Services, Succession and Biodiversity (23)

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Twisted aestivation is characteristic ofRead the answer and worked solution →Coconut fruit is BEST described as aRead the answer and worked solution →Marginal placentation, with ovules in two rows along the ventral suture, is seen inRead the answer and worked solution →Apocarpous and syncarpous gynoecia differ in thatRead the answer and worked solution →

Worked practice questions

Twisted aestivation is characteristic of

  1. Pea with vexillary arrangement
  2. Calotropis with sepals just touching
  3. China rose with overlapping margins
  4. Cassia with random overlap orientation
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Correct answer: C. China rose with overlapping margins

**Twisted:** one margin of each appendage overlaps the next in a consistent direction (china rose, cotton, lady's finger). **Valvate:** just touching (Calotropis). **Imbricate:** irregular overlap (Cassia, gulmohur). Vexillary: pea, bean.

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Coconut fruit is BEST described as a

  1. Berry with juicy fleshy pulp
  2. Pome with accessory tissue
  3. Caryopsis like cereal grains
  4. Drupe with fibrous mesocarp
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Correct answer: D. Drupe with fibrous mesocarp

Coconut is a drupe (one-seeded, with differentiated pericarp). Its mesocarp is fibrous (coir) rather than fleshy. The endocarp is the stony shell; the white kernel is the endosperm.

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Marginal placentation, with ovules in two rows along the ventral suture, is seen in

  1. Sunflower and marigold heads
  2. Pea and many leguminous flowers
  3. China rose and tomato flowers
  4. Mustard and Argemone flowers
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Correct answer: B. Pea and many leguminous flowers

**Marginal placentation:** placenta is a ridge along the ventral suture of a single carpel ovules are arranged in two rows (pea). Each placentation type is diagnostic of a family/group.

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