Correct Answer: A. cells arise from nonliving substances

Correct Answer: D. Cellulose

Correct Answer: D. increase the surface area for absorption

Correct Answer: C. Air

Correct Answer: C. glucose

Correct Answer: C) klinostat

Explanation

Geotropism is a plant's response to gravity. It causes the plant's roots to grow downwards and the stem to grow upwards. To perform an experiment on geotropism, we need an instrument that can manipulate the direction of gravity. Out of the options given, only the klinostat can be used to perform an experiment on geotropism. A klinostat is a laboratory instrument that can be used to study the effects of gravity on plants. It rotates the plant at a slow and constant speed, causing the direction of gravity to constantly change. This allows us to study the effects of gravity on plant growth and development. A potometer, on the other hand, is an instrument used to measure the rate at which a plant loses water through transpiration. A cup anemometer is used to measure wind speed, a kymograph is used to measure physiological changes in organisms, and a sphygmomanometer is used to measure blood pressure in humans. Therefore, the correct option for an instrument that can be used to perform an experiment on geotropism is option C: klinostat.

Correct Answer: B) clay

Explanation

This question is asking about the name for soil with the smallest particles. The options are silt, clay, sand, gravel, and laterite. The correct answer is clay. Soil is made up of different-sized particles, including sand, silt, and clay. Clay particles are the smallest, with a diameter of less than 0.002 mm. This means that they are tightly packed together and do not allow water to pass through easily. Clay soils tend to be heavy and sticky when wet, and they can be difficult to work with. Silt particles are slightly larger than clay particles, with a diameter of between 0.002 and 0.05 mm. They are not as tightly packed as clay particles, which means that water can pass through them more easily. Silt soils are easier to work with than clay soils, but they can also be prone to erosion. Sand particles are larger still, with a diameter of between 0.05 and 2 mm. They are loosely packed, which means that water can pass through them very easily. Sand soils are light and easy to work with, but they do not retain moisture well. Gravel particles are even larger, with a diameter of between 2 and 75 mm. They do not retain moisture well and are not suitable for most plants. Laterite soils are common in tropical regions and are formed from the weathering of rocks. They are typically rich in iron and aluminum, and can be used for construction. Therefore, the correct answer to this question is clay, as it has the smallest particle size of all the options listed.

Correct Answer: C. chromosome

Correct Answer: C. Covering the transparent beaker with black cloth

Explanation

(a) (i) Renewable natural resources

Materials that can be reused/replaced/ regenerated/recycled; after they have been used

(ii) Non-renewable natural resources

Materials that are difficult/impossible to regenerate/ recycled; after being exhausted/depleted.

(b) (i) Renewable natural resources

Air; soil; crops; fisheries; water; vegetation/forest; game/wildlife.

(ii) Non-Renewable natural resources Rocks; coal; minerals/correctly named example; crude oil/petroleum.

(c) Ways of conserving forest

• Prevent forest/bush fires
• Practice selective cutting of trees/avoid indiscriminate felling of trees
• Regulations/laws to control excessive clearing of forest
• Employ forest guards to prevent/arrest intruders
• Use pesticides to kill pests/control plant diseases
• Embark on public education on dangers of deforestation.

(d) Effects of adding animal manure to garden soil

• Animal manure provides nutrients/nitrogenous materials /improves soil fertility
• Animal manure are acted upon by nitrifying bacteria
• To form nitrates for plants
• Manure improves the water-holding properties of the soil by binding the soil particles together/ improves soil structure
• Prevents soil from being blown away by wind/erosion

(e) Possible genotypes in humans

AA, AS, SS