IGCSE Biology Paper-3: Specimen Questions with Answers 168 - 169 of 230

Question number: 168

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Short Answer Question▾

Write in Short

Choose words from the list to complete each of the spaces in the paragraph. Each word may be used once only and some words may not be used at all.

Transpiration, evaporation, Roots, stem, Nutrients, stomata’s

………. . is the ……… of water into the atmosphere from the leaves and stems of plants. Plants absorb soil water by their… while some desert plants have roots that extend 20 meters into the ground. Plants pump the water up from the soil to deliver…… to their leaves. This pumping is driven by the evaporation of water through small pores called …, which are found on the undersides of leaves. Transpiration accounts for approximately 10 % of all evaporating water.

Explanation

Transpiration is the evaporation of water into the atmosphere from the leaves and stems of plants. Plants absorb soil water by their roots. Desert plants have roots that extend 20 meters into the ground to get water. Plants pump the water up from the soil to deliver nutrients to their leaves. The pumping is caused by evaporation of water from “stomata” (pores), which are found on the undersides of leaves. Transpiration causes 10 % of all evaporating water.

Question number: 169

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MCQ▾

Question

The diagram shows a half-flower. Define X?

The figure shown half flower

The Figure Shown Half Flower

Find x in given diagram

Choices

Choice (4) Response

a.

Pistil

b.

Stamen

c.

Petal

d.

ovary

Answer

c.

Explanation

Petals are changed leaves with brighter color that frame the reproductive parts of flowers.