Start learning →

Kerala DHSE Plus One Unit 2A: Ecosystem Services, Succession and Biodiversity — practice questions

Explore 23 free Unit 2A: Ecosystem Services, Succession and Biodiversity questions in Kerala DHSE Plus One Environmental Science. Open each question or exercise to read its content, reference answers and available explanation.

Practise Unit 2A: Ecosystem Services, Succession and Biodiversity with Quill →

Unit 2A: Ecosystem Services, Succession and Biodiversity questions and exercises with answers

Showing questions 1–23 of 23.

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 →A typical floral formula uses the symbol Br forRead the answer and worked solution →In the seed of castor, the food storing tissue isRead the answer and worked solution →Stomata are bordered by a pair of cells calledRead the answer and worked solution →In grasses, the guard cells areRead the answer and worked solution →Root hairs areRead the answer and worked solution →Parenchyma, collenchyma and sclerenchyma collectively form theRead the answer and worked solution →Bulliform cells are found inRead the answer and worked solution →In the dicot stem, the endodermis is also called theRead the answer and worked solution →The vascular bundles in the dicot stem areRead the answer and worked solution →In monocot stems, the vascular bundles areRead the answer and worked solution →In dicot stems, the cambium between xylem and phloem makes the vascular bundleRead the answer and worked solution →In a dicot leaf, the mesophyll is differentiated intoRead the answer and worked solution →The outermost layer of the primary plant body is theRead the answer and worked solution →Casparian strips are found in theRead the answer and worked solution →The monocot root differs from the dicot root in havingRead the answer and worked solution →Hypodermis of a typical dicot stem is composed ofRead the answer and worked solution →Trichomes on the stem are usuallyRead the answer and worked solution →Vascular bundles in roots have xylem and phloem arrangedRead the answer and worked solution →In the dicot root the number of xylem and phloem patches isRead 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
Show answer and solution

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.

Open this question →

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
Show answer and solution

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.

Open this question →

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
Show answer and solution

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.

Open this question →

How to practise

  1. Choose a Unit 2A: Ecosystem Services, Succession and Biodiversity question and try to work out your answer.
  2. Open the question to check the correct answer and read its worked solution.
  3. Continue in the app for bite-sized lessons, explanations and review with Quill. You can start without creating an account.

Put it into practice

Continue with Unit 2A: Ecosystem Services, Succession and Biodiversity practice for Kerala DHSE Plus One. Read explanations as you go. No signup form needed to start.

Practise Unit 2A: Ecosystem Services, Succession and Biodiversity →