Correct Answer: C. Dog fish

Correct Answer: C. Semi-circular canals

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

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: D. Deer eating grass

Explanation

A primary consumer is any animal that consumes primary producers (autotrophs). Autotrophs consist of any creatures that create their own energy (in the form of sugars) from sunlight. Grass and algae would be considered autotrophs. Deer are the only animals shown here that consume autotrophs and are, therefore, primary consumers.

Correct Answer: A. Autecology

Correct Answer: D. mRNA

Explanation

mRNA, or messenger RNA, carries genetic information from DNA into a three-letter code that encodes the amino acid sequence of a polypeptide (protein). DNA contains the genetic instructions for structure and development of living things and stores genetic information over the long term. tRNA, or transfer RNA, brings amino acids to ribosomes during translation of RNA to protein. rRNA, or ribosomal RNA, is a component of ribosomes along with ribosomal proteins. Ribosomes are the cell organelles responsible for translating mRNA to protein. snRNA, or small nuclear RNA, forms complexes with proteins used in RNA processing. snRNA is found only in eukaryotes.

Correct Answer: A. chlorophll and carotenoids

Correct Answer: D) down syndrome

Explanation

Abnormalities with chromosome 21 in humans can lead to a genetic condition known as Down syndrome. Down syndrome is a condition where a person has an extra copy of chromosome 21, resulting in intellectual disability and physical abnormalities. It is a genetic disorder that affects development and can lead to various health problems such as heart defects, hearing loss, and vision problems. The condition is usually diagnosed shortly after birth by observing physical characteristics such as a flat face, small head, and upward slanting eyes. Down syndrome is not caused by any actions of the parents and cannot be prevented. However, early intervention and support can improve the quality of life for individuals with Down syndrome. Therefore, it is essential to provide adequate support and care to individuals with Down syndrome to help them lead healthy and fulfilling lives.

Correct Answer: A. proteins