IGCSE Biology Paper-5: Specimen Questions with Answers 50 - 51 of 62

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Question 50

Describe in Detail

Essay▾

Observe the given flower specimen carefully. Describe the floral characteristics. Write 3 uses of given flower.

Image Shows a Flower

Explanation

Characteristics

  • The flowers are large and conspicuous
  • Present with five or more petals
  • Color from white to pink, red, orange, peach, yellow or purple and from 4 – 18 cm broad.

Uses

  • This is national flower of Haiti so it has the symbolism and cultural value.
  • Many species are used as landscape shrubs
  • One species of this plant which is Hibiscus cannabinus is used in paper-making
  • It is also used for making cold beverage
  • Dried hibiscus is edible, and it is often a delicacy in Mexico. It can also be used as a garnish

Question 51

Describe in Detail

Essay▾

Make a temporary slide to observe plant cells of onion and observe the slide under the microscope

Figure Showing Onion

Explanation

To make a temporary slide of given plant cell first remove its outer dry pink covering. Then Cut the onion bulb into two halves and take out a fleshy leaf, carefully pull out the thin white peel from its inner surface with a forceps

Figure Shows Removing of Outer Dry Pink Color of Onion

Cut a small piece of the thin onion peel with a blade/scalpel and place on a clean micro-slide. Add 2 - 3 drops of water onto the slide and spread the onion peel. Add a drop of methylene blue solution. Carefully place a cover glass on it ensuring that there are no air bubbles under the cover glass. Observe the slide under the microscope.

We will observe a number of compactly arranged rectangular cells separated from each other by cell walls. A thin membrane can be observed beneath the cell wall. The cell has a jelly – like substance containing a dense dark colored round body

Figure Shows Observation of Onion Cell under the Microscope

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