Correct Answer: C. Dog fish

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Correct Answer: A. impulses fromreceptors in the legs cannot travel to the brain

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Correct Answer: D. there are no anti-A and anti-B antibodies in the serum

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Explanation

(a) (i) Reasons why termites are called social insects:

(1)They live in colonies or communities. (2)They undergo division of labour.

(ii) Castes found in termites nest are -king.

-queen.

-workers.

-soldiers.

Role: king fertilizes the eggs Queen lays the eggs workers do all the necessary work, e.g. building of colony, provision of food, feeding of the young ones and the queen Soldiers defend the colony.

(b) Behavioural adaptation of termites:

(i) Laying of many eggs which hatch into nymphs thereby ensuring survival of many.

(ii) Movement in group enables them to ward off their enemies.

(iii) They build tunnels and burrows into the heart of wood and this protects them from their enemies and harsh weather conditions.

(iv) They feed on their dead members and this helps to maintain a clean and healthy colony.

(v) Presence of inter-connecting tunnels enhances aeration within the termites nest.

Correct Answer: C. Ensures that the cell has matured to a sufficient state before beginning synthesis.

Explanation

The G₂ checkpoint of cell division prevents the cell from entering the mitotic or dividing phase until all chromosomes have accurately been replicated. Other answers: Prevents sister chromatids from separating before each chromatid is secured to a spindle microtubule refers to the spindle or M checkpoint. Initiates the cell division process if conditions are favorable and Ensures that the cell has matured to a sufficient state before beginning synthesis refer to functions of the restrictive or G₁ checkpoint. Ensures that each daughter cell has received the correct number of chromatids after cell division is incorrect since there is no checkpoint in cell division to error check the results of mitosis.

Correct Answer: A. Autecology

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Correct Answer: B. All of these

Explanation

There are generally considered to be three major differences between DNA and RNA. 1) DNA has a main sugar of deoxyribose and RNA has a main sugar of ribose, 2) RNA uses uracil instead of thymine, and 3) RNA is almost exclusively a single-stranded nucleic acid. Further, DNA is generally the template that an organism uses to create RNA (except in specific organisms which use reverse transcriptase and use RNA to create DNA).

Correct Answer: A. chlorophll and carotenoids

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Correct Answer: D) mushroom

Explanation

This Biology question is asking us to identify the organism that is not an autotroph. An autotroph is an organism that is capable of producing its own food through photosynthesis or chemosynthesis. Out of the four options given, spirogyra, zea mays, and rhizobium are all autotrophs. Spirogyra is a type of green algae that uses photosynthesis to produce its own food. Zea mays, commonly known as corn, is a plant that also uses photosynthesis to produce its own food. Rhizobium, on the other hand, is a type of nitrogen-fixing bacteria that produces its own food through chemosynthesis. The correct answer to this question is option D: mushroom. Mushrooms are not autotrophs because they cannot produce their own food through photosynthesis or chemosynthesis. Instead, they are heterotrophs, which means they obtain their nutrients by consuming other organisms or organic matter. It's important to understand the difference between autotrophs and heterotrophs because they play important roles in the food chain and ecosystem. Autotrophs are the base of the food chain, providing food and energy for all other organisms. Heterotrophs, including humans, rely on autotrophs for their survival. In summary, the correct answer to this question is option D: mushroom, because it is not an autotroph. Autotrophs are organisms that produce their own food, while heterotrophs rely on other organisms for food.

Correct Answer: A. proteins

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