Correct Answer: D. Barometer

Correct Answer: D. used up the available oxygen

Correct Answer: D. caterpillar

Correct Answer: A. To aid in enzyme function

Correct Answer: B. epiglottis

Explanation

The structure that could result in choking when talking and eating at the same time is the epiglottis. The epiglottis is a flap-like structure located at the base of the tongue, near the entrance of the windpipe (trachea). Its primary function is to prevent food and liquids from entering the trachea and lungs during swallowing. When you swallow, the epiglottis covers the opening of the trachea, directing food and liquids into the esophagus, which leads to the stomach. This prevents choking and aspiration of food into the respiratory system.

Correct Answer: A) Amoeba sp.

Explanation

This question is asking for an example of a unicellular organism. A unicellular organism is a living thing that is made up of only one cell. The options given are Amoeba sp., Hydra sp., Ascaris sp., Taenia sp., and Obelia sp. Out of all the options provided, the correct answer is Amoeba sp. Amoeba is a unicellular organism that belongs to the group of organisms known as protozoa. It is a simple organism that moves and feeds by extending its pseudopodia, which are like small arms. Amoeba can be found in freshwater and soil. It is important to note that while all the organisms listed in the options are living things, not all of them are unicellular. Hydra sp., for example, is a multicellular organism that belongs to the group of organisms known as cnidarians. Ascaris sp. and Taenia sp. are also multicellular organisms that belong to the group of organisms known as helminths or parasitic worms. Obelia sp. is a colonial organism that is made up of many individual cells working together. In conclusion, Amoeba sp. is an example of a unicellular organism because it is a living thing that is made up of only one cell.

Correct Answer: B. photosynthesis

Explanation

As photosynthetic organisms, plants take up atmospheric CO2, chemically reducing the carbon. This represents not only an acquisition of stored chemical energy for the plant, but also provides the carbon skeletons for the organic molecules that make up a plants' structure.

Correct Answer: B. holozoic

Explanation

Holozoic nutrition is a type of nutrition in which organisms consume solid organic materials. This is the type of nutrition seen in most animals, where food is ingested and then broken down through digestion. This is different from symbiotic (where two organisms live together and benefit from each other), saprophytic (where organisms feed on dead and decaying matter), and parasitic (where one organism benefits at the expense of another) nutrition.

Explanation

(a)(i) Deficiency Disease; This is a disease caused by lack of or insufficient or inadequate supply of a specific vitamin or other nutrients/food substances.

(a)(ii)

(b) Procedure of Chemical Test for;

(i) Starch in a tuber of yam; The tuber of yam is peeled and sliced, a few drops of iodine solution is added to the peeled yam, blue-black colour formed indicates presence of starch.

(ii) Glucose in orange fruit; Orange fruit is cut and it's juice is extracted into a beaker/test tube, few drops of Benedict's solution/Fehling's solutions A and B is added to equal volume of orange juice, add heat gently, a red/orange/brick-red precipitate shows the presence of glucose. For Benedict's solution when heated shows red/yellow precipitate confirming presence of glucose

Explanation

(a)(i) Difference between genotype and phenotype: A person's genotype is the sum total of the person's genetic constitution; while the phenotype is the observed trait/physical characteristics.

(ii) Factors which determine genotype: -

• Genotype of parents
• Mutation.

Factors which determine phenotype: -

• Genotype
• Environment;
• Diet
• Health.

Phenotypic ratio 3 black 1 white puppies

(b)Calculation: The number of white puppies using the phenotypic ratio

3 black: 1 white = 24

Total No of puppies produced = 240 .

No of white puppies produced = ¼ x 240 = 60 white puppies

(b)(ii) Number of black puppies = ¾ x 240 = 180 black puppies

OR calculation b(ii)

No of black puppies ¾ x 240 = 180

b(i) No of white puppies ¼ x 240 = 60