Correct Answer: A. Nearness to the source of raw materials

Correct Answer: A. \(\frac{3}{2}\) or \(1\)

Explanation

\((2t - 3s)(t - s) = 0 \implies (2t - 3s) = \text{0 or} (t - s) = 0\)

\(2t - 3s = 0 \implies 2t = 3s \therefore \frac{t}{s} = \frac{3}{2}\)

\(t - s = 0 \implies t = s \therefore \frac{t}{s} = 1\)

\(\frac{t}{s} = \frac{3}{2} or 1\)

Correct Answer: C. i and iii

Correct Answer: B) The interactions between living organism in a habitat and the non-living part of the environment

Explanation

An ecosystem refers to the interactions between living organisms in a particular habitat and the non-living part of the environment. This includes the physical and chemical factors such as sunlight, precipitation, soil, and air. An ecosystem can be big or small and can be found in various places such as deserts, oceans, and forests. It can be made up of different types of organisms such as plants, animals, and microorganisms that interact with each other and the environment. Option A states that an ecosystem is a place where living organisms can live successfully. While this is partially true, it does not encompass the full meaning of an ecosystem. Option B, on the other hand, is the correct answer as it accurately describes the interactions between living organisms and their non-living environment. Option C is incorrect as it refers to a specific type of interaction between a plant and an animal and not the broader concept of an ecosystem. Option D is also incorrect as it describes a system of organizing organisms in a habitat, rather than the interactions between them and their environment. Option E is incorrect as well since option B is the correct answer. Understanding the concept of an ecosystem is important in biology as it provides insight into the relationships between living organisms and their environment, and the impact of human activities on these relationships.

Correct Answer: D. T = 5F

Correct Answer: A. population pressure

Correct Answer: A. separate legal entities

Explanation

(a) Importance of transport systems in mammals are as follows:

(i) The primary purpose of transport systems .is to move materials throughout the body of the organism

(ii) Mammals have various substances/materials for specific functions located in different parts/organs of the body; For example oxygen is present in the lung while digested food is located in the alimentary canal

(iii) Through transport systems metabolic waste products/excretory products are eliminated/removed via the kidney/lung/skin

(iv) Hormones which are produced by the endocrine glands are made available to far away cells which they serve

(v). Blood is the main medium of transport; assisted by the lymphatic system/lymph

(vi)Mammals being large and complex organisms have a surface area comparatively smaller than the volume/surface volume ratio is low. Diffusion alone is inefficient

(vii) Therefore there is the need to develop an efficient transport system to cope with this problem.

(b) Functions of blood in mammals:

(i) Blood serves as a transport medium of soluble organic compounds/digested food from the small intestines to various parts of the body where they are stored/assimilated or used; and transported from storage areas where they are used.

(ii) It transports soluble excretory waste materials such as Urea/CO2/to organs of excretion such as kidney/lungs.

(iii) Transport of hormones / from the glands/corresponding gland/where they are produced to target organs is also facilitated.

(iv) Distribution of excess heat from deeply seated organs to maintain a constant body temperature is equally a function of the blood.

(v) Transport of oxygen from the lungs to all parts of the body/transport of carbon dioxide produced by the tissues to the lungs.

(vi) Defence against disease/foreign bodies through photocytosis.

(vii) When an injury occurs, clotting of blood (by platelets/thrombocytes and fibrinogen) prevents excess loss of blood, and also prevents entry of pathogens/germs.

(viii) Immunity is achieved by antibodies and lymphocytes carried by blood.

(ix) Transports water

(x) Transports mineral salts.

(c) The following are materials transported in the bodies of flowering plants:

(i) Latex/secretion/specific secretion

(ii) Water/soil water

(iii) Manufactured food / specific food e.g. glucose, amino acids

(iv) Hormones/auxins

(v) Dissolved mineral salts/specific salts e.g. nitrated, phosphate

(vi) Oxygen

(vii) Carbon dioxide.

(viii) Excretory products

Correct Answer: C. government and private investors

Correct Answer: A. Okpara