Correct Answer: B. iron

Explanation

Iron deficiency in plants leads to chlorosis, which is the yellowing of leaves. Chlorosis occurs because iron is necessary for the formation of chlorophyll, which is the green pigment in plants that absorbs light energy for use in photosynthesis. Without sufficient iron, the plant cannot produce enough chlorophyll, leading to yellow leaves. Stunted growth is also a symptom of iron deficiency as iron is essential for various metabolic processes including DNA synthesis.

Correct Answer: C. The ground is flooded most of the time

Correct Answer: C. Buttress roots

Correct Answer: D. eustachian tube

Correct Answer: C. acquired traits cannot be passed on to the offspring

Explanation

(a) (i) Similarities found in plant and animal cells are:Cytoplasm, Nucleus, nucleolus, DNA, RNA, chromosomes, Cell membrane, Mitochondria, Golgi bodies, Endoplasmic reticulum, Nuclear membrane, Ribosomes.

(b) (i) The two types of cell divisions are Mitosis and Meiosis (ii)(a) Examples of life processes involved in mitosis are: Formation of new cells in the maiphigian layer of skin, Production of red blood cells and white blood cells in the bone marrow, Cell division in liver, Growth Spermatogenesis, Repair or healing of wound, Binary fission.

(b) Examples of life processes involved in meiosis are: Formation of sperms (male gametes), Formation of oval eggs (female gametes), Formation of pollen grains in anther of flowering plants, Formation of ovules (in ovary) of flowering plants.

(c) Two reproductive methods in organisms are:Sexual and Asexual

Correct Answer: B. Root hairs and mammalian hairs

Correct Answer: D. myopia

Explanation

(a) Experiment to show that green plants require sunlight for photosynthesis;

(i) Take two potted plants and get them well watered

(ii) De-starch the leaves by keeping plants in a dark cupboard 'at least for 24 hours/overnight

(iii) Then test leaf samples of both plants for starch

(iv) The result is negative/yellowish-brown colour which shows absence of starch

(v) Leave one potted plant in the dark cupboard as a control and put the other plant in sunlight for 4-6 hours

(vi) Re-test leaves from both plants for starch. You will discover that

(vii) leaves from plant exposed to sunlight show presence of starch, while those from the control plant/kept in dark cupboard shows absence of starch

(viii) This indicates that sunlight is necessary for photosynthesis.

(b) Other conditions necessary for photosynthesis include the following:

(i) Presence of water

(ii) carbon dioxide

(iii) chlorophyll/chloroplast

(vi) suitable temperature

(c) Site or part of dicotyledonous leaf where photosynthesis occurs is the palisade layer; because it contains more chloroplasts/chlorophyll; than the spongy layer/other parts. Palisade cells are located just beneath the upper epidermis; where the chlorophyll could absorb more sunlight

(d) Fate of food manufactured by green plants:

(i) Manufactured food/glucose; is trans-located to various parts of the plant through the phloem

(ii) This can be combined with other elements such as nitrogen and sulphur to form proteins; for growth. It can also be converted to starch and stored. It is needed/used in respiration/metabolic activities. It is broken down into carbon dioxide and water to produce energy. Other products like lipids and cellulose can also be manufactured from glucose.

Correct Answer: D. Phosphorus