Biology 11 past paper 2023

A person is given a vaccine for COVID. This is an example of:

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List any three organelles bounded by a single membrane and any three organelles bounded by double membrane.

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What is plasma membrane? Explain in detail fluid mosaic model of plasma membrane.

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State property of water that allows each of the following to take place. Briefly explain its importance: a. The cooling of skin during sweating b. The survival of fish in ice-cover…

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How does the body give an inflammatory response when tissues are damaged?

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Advantages to life on land for early amphibians included:

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A group of ribosomes attached to mRNA is known as:

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Briefly explain what will happen if dead bodies are not decomposed by bacteria?

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Photosynthesis and respiration are said to be complementary. How are these chemical reactions connected?

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Which of the following pair is mismatched?

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What will happen if plants are exposed to green light? Explain briefly.

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Describe uses of fungi in genetic engineering and antibiotic production.

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What can be found in both **DNA** and messenger **RNA**?

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How penicillin affects bacterial cell? Describe briefly.

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What does **ECG** stand for? Explain different phases with the help of a labelled diagram.

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The compound that enters Kreb's cycle from glycolysis is:

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Compare the osmotic adjustments in different groups of plants in different environments.

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Mesosomes are infoldings of the cell membrane and are involved in:

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List six features of bryophytes which made them to adapt on land.

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Chitin is found in the cell wall of fungi, which is also found in the exoskeleton of:

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Why many insects are pests to humans when they are larvae but are beneficial when they are adults? Explain briefly.

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In spermatophyte, seed is formed from:

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Differentiate between: a. Collenchyma and sclerenchyma b. Photoperiodism and Phototropism c. Apoplast pathway and symplast pathway.

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Which of the following pair of words are correctly matched?

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Many animals including humans eat seeds such as beans, peas, peanuts and almonds. Why are seeds a good food source?

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Apical dominance is caused by:

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If stomach fails to produce $HCl$, how would this affect digestion? If left untreated, how could this affect the body as a whole?

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Describe three functions of digestive system. Write down sequence of organs according to the order in which food passes through them.

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Which of the following cells are destroyed in an **AIDS** infection?

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How would chronic diarrhoea affect homeostasis of the body?

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What type of chemical reaction would be involved in the formation of glucose from starch or glycogen? Explain briefly.

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A new mother had chicken pox as a child. Why does her newborn child not get the disease, even after being exposed to its virus?

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How photosynthetic pigments are arranged in photosystem? Differentiate between the two types of photosystem.

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Differentiate between viruses and viroids. Also give examples.

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