Correct Answer: A. the movement of food and water

Correct Answer: A. blunt

Correct Answer: B. Earthworm

Correct Answer: D. Malaria, cholera and river blindness

Correct Answer: A) Branch root originate in the pericycle while branch stems do not

Explanation

The question is asking about the difference between roots and stems. The options given are: Option A: Branch roots originate in the pericycle while branch stems do not (Correct) Option B: Stems are always below the ground while roots are always under the ground Option C: Stems are positively geotropic while roots are negatively geotropic Option D: Stems are sometimes used for storage while roots are never so used The significant difference between roots and stems is that branch roots originate in the pericycle while branch stems do not. This means that roots grow from the pericycle, which is a layer of cells in the root, while stems do not. Stems, on the other hand, grow from the apical meristem, which is the tip of the stem. Option B is incorrect because stems can be above or below the ground while roots are always below the ground. Option C is incorrect because both roots and stems can be either positively or negatively geotropic depending on the plant species. Option D is incorrect because stems can sometimes be used for storage, such as in the case of cacti, while roots can also be used for storage, such as in the case of sweet potatoes. Understanding the difference between roots and stems is important in studying plant anatomy and physiology. Roots are important for anchoring the plant, absorbing water and nutrients from the soil, and storing carbohydrates. Stems, on the other hand, are important for supporting leaves and flowers, transporting water and nutrients from the roots to the leaves, and photosynthesis. To learn more about the structure and function of roots and stems, please read the relevant sections of the recommended textbooks.

Correct Answer: C. primary

Explanation

(a)(i)Conservation: Planned/wise/judicious use/management of the earth's natural resources; in order to ensure sustenance/availability/continuity; and preservation of the quality of the natural/original nature of the environment.

(ii) Factors responsible for decline of abundance and variety of wildlife:

• Commercial hunting which kills off animals indiscriminately
• industrialization which involves clearing of forests
• for various purposes/construction/farming/urbanization
• destruction of habitats of wildlife by human activities
• bush burning/noise pollution leads to wildlife migration
• environmental pollution which releases dangerous materials that degrades environment making it unbearable for the wildlife
• massive/excessive tree felling to make charcoal/domestic uses
• lack of awareness/inadequate education of populace on the need for conservation
• lack of adequate funding to enforce conservation policy.

(b) Ways by which the Government can improve the situation:

• establishment of forestry departments
• establishment of Environment Protection Agency to improve the situation
• creation of Parks and Games Reserves/any correctly named example; to preserve/maintain plants and animals in their natural environment
• conservation education carried out through tree planting! campaigns against bush burning/ tree felling /poaching
• conservation laws to regulate tree felling; poaching/hunting of wild animals and bush burning
• establishment of zoological gardens preserving endangered species.

(c)(i)Eutrophication: Excessive growth of plant life/algae/algal bloom; in water courses/bodies, caused by an increase in organic nutrients and minerals; leading to the death of aquatic organisms.

(ii)Causes of eutrophication:Overuse of fertilisers/plant nutrients which drain off into water bodies; sewage discharge; was from fish farming.

Correct Answer: D) snail

Explanation

In Biology, animals can have different types of skeletons, one of which is called a jointed skeleton. This type of skeleton is made up of segments that are connected by joints, allowing for flexibility and movement. The question is asking which animal does not have a jointed skeleton. Out of the options given, cockroach, spider, and millipede are all examples of animals that have jointed skeletons. However, snails do not have jointed skeletons, which is why option D is the correct answer. It is worth noting that snails have a hard external shell that protects their body, but this is not the same as a jointed skeleton. In fact, snails belong to a group of animals called mollusks, which have a different type of body structure compared to insects and arachnids. Understanding the different types of skeletons and body structures is important in Biology, as it helps us to classify and understand the diversity of animal life on Earth.

Correct Answer: D. incomplete dominance is not possible

Correct Answer: A. diffusion