89-Q020 89-Q020

89-Q020 4

89-Q020

89-Q020

Multiple Choice Questions

  1. B

  2. A

  3. B

  4. B

  5. D

  6. C

  7. C

  8. B

  9. A

  10. B

True/False Questions

  1. False

  2. True

  3. False

  4. False

  5. True

  6. True

  7. True

  8. True

  9. True

  10. False

Discussion Questions

Q21. Three measures that may be taken to get seeds to grow include,scarification, soaking and stratification. Some seeds have a coat,which makes them hard and resist water. Through scarification, theseed coat is removed allowing water to saturate the seed enablinggermination. Seeds can be soaked prior to planting. Presoaking makesthe seed coats soft. It is effective for seeds that sprout slowlypriming them to germinate. Stratification involves warming, as wellas chilling seeds to eliminate the chemical inhibitors, which impedethe germination.

Q.22 Seeds and fruits have adaptations, which help in dispersal.Dispersal relies on the size, structure and composition of the seed.Water helps seeds to disperse as they float and are moved todifferent places. These are mainly seeds from light and afloatfruits. Through wind, it is also probable to disperse seeds withwing-like attachments. Animals disperse seeds through excretion ofburying. Some fruits comprise systems, as hooks, which attach to thefur of animals. Humans also aid in dispersal through transportingfruits to diverse places and throwing away the parts that cannot beeaten, mostly seeds. Other seeds have the capability of remaininginactive and germinate when conditions are good.

Q.23 The disparities amid a vegetable and berry are applicable inoverturning the ruling. This is because the differences enhanceunderstanding as to why the tomato is a berry. The tomato is a berrybecause a large section of its pericarp is fleshy. Despite beingcommonly referred to as a vegetable, it is a botanical fruit known asthe berry. Any section of the plant that holds the seeds are regardedas a fruit, hence making the tomato a fruit as it holds seeds unlikevegetables, which are seedless. The tomato is a berry because itdevelops from the flower. Contrary vegetables are in most cases whatmakes the leaves, stems and roots.

Q24. The features found in pines growing at cold climates areimportant because they reduce surface area, which is necessary forminimizing the loss of water. Pine needles are advantageous duringcold climates as they minimize harm arising from heavy snows. Thesunken stomata are advantageous because they ensure that air canprogress slowly in and from the air spaces.

Q.25 Sun leaves are small when compared to shade leaves. Shade leavesare not as thick as sun leaves, due to the presence of extra palisadecells in sun leaves. Shade leaves have more chlorophyll, whichassists them in the efficient processing of sunlight and carry outphotosynthesis despite lesser sunlight levels. The behavior ofchloroplasts differentiates both leaves. Sun leaves expose themselvesto sunlight in turns and hide under different chloroplasts whenconverting light to energy. Shade leaves expose themselves to take inas much light as they can.

Q.26 In dry areas, leaves comprise of thick cuticle, veins withbundle sheaths that are extended and needle like leaves. Anillustration is the pine, and the objective is to minimize waterloss. Most desert plants, like aloe, grow succulent leaves used forstoring water. Most recognized are succulent leaf bases fromunderground bulbs, like tulip. Tendrils are common leaf modificationsfor climbing. For instance, the leaf tip of the flame lily lengthensto a tendril and climbs onto other plants for support. Leaves thathave been altered for reproduction create tiny plants on leaf edges.The tiny plants turn into new plants after shedding from parentleaves. Leaves adjusted to trap insects are common in carnivorousplants. They include sticky leaf surfaces and leaves that appear vatlike.