Correct Answer: A. microscope

Explanation

(a)(i)Placentation: This is the arrangement of ovules, within the ovary.

(b) (i) Organs Associated with human

placenta: Umbilical cord, Uterus

(b)(ii) Functions of Placenta:

• Establishes connection between the embryo and the mother.
• Carries oxygen/water/food/ nutrients from mother's blood to foetus.
• Removes waste/urea/salt/carbon dioxide from foetus blood to mother's blood for elimination.
• Produces progesterone/hormone for maintenance of uterine wall/ endometrium/pregnancy.
• Carries antibodies from mother's blood to foetus.

(c) Viviparity:This is a type of reproduction in which the young develops inside the mother's body. Obtaining nutrients directly from the parent. When fully developed, the young are born alive.

(ii) Territoriality:In many animal species individuals, usually males mark out areas/territories where they can live and breed.

• They guard these territories fiercely.
• Chasing away other members of the species.
• Only vigorous individuals are able to establish large territories, secure suitable mates and produce many offspring.
• Territoriality limits overcrowding.
• Animals that carry out this phenomenon are lizards, lions, etc.

(iii) Seasonal migration:

• In many habitats food supply is affected by seasonal changes. Food is abundant in rainy seasons but scarce in dry seasons.
• Animals overcome these seasonal food shortages by moving to other habitats during unfavourable seasons.
• Such large scale seasonal movements of animals between habitats are called migrations.
• Other causes of migrations are temperature changes and breeding seasons.

Correct Answer: C) insect

Explanation

The question is asking which animal does not have an alimentary canal. An alimentary canal is a digestive tube that runs from the mouth to the anus and is usually found in animals that have a complete digestive system. The options given are earthworm, jellyfish, insect, fish, and mollusks. An earthworm has an alimentary canal, so it cannot be the correct answer. A jellyfish also has an alimentary canal, so it is not the correct answer either. A fish and mollusks both have an alimentary canal as well, so they cannot be the correct answer. The correct answer is option C, insect. Insects lack an alimentary canal. Instead, they have a digestive system consisting of a foregut, midgut, and hindgut. The foregut is responsible for storing and grinding food, while the midgut is responsible for digesting and absorbing nutrients. The hindgut is responsible for absorbing water and eliminating waste. In summary, the animal that lacks an alimentary canal is an insect. It is important to know the different types of digestive systems found in animals to better understand their feeding habits and nutritional needs.

Correct Answer: B. its cells are prokaryotic

Correct Answer: D. lymph

Correct Answer: A. The linear amino acid sequence of the protein

Explanation

The primary structure of a protein is simply the linear amino acid sequence from which the protein is made. Secondary structure refers to the folding and coiling of this single strand as it interacts with itself, forming hydrogen bonds between amino acids of that strand. Alpha helices and beta-pleated sheets are two different types of secondary structures that can be formed by hydrogen-bonding between amino acids of a protein sequence that has folded over onto itself. Tertiary structure refers to the final three-dimensional structure of a single protein subunit. Quaternary structure refers to the non-covalent interactions between multiple protein subunits which come together to form a larger protein.

Correct Answer: B. clotting of blood

Correct Answer: C. pancreas

Correct Answer: A. Hibernating during the hottest part of the day

Explanation

Estivation: Certain animals enter a state of estivation, which is similar to hibernation but occurs in response to hot and dry conditions. They become inactive, conserve energy, and reduce water loss during the hottest parts of the day or during extended periods of high temperatures.

Correct Answer: B. Nitrogen fixation

Explanation

Nitrogen fixation is the process in the nutrient cycle that converts atmospheric nitrogen (N2) into a form that plants can utilize, typically ammonium (NH4+) or nitrate (NO3-). This process is carried out by nitrogen-fixing bacteria, which can either be free-living in the soil or form mutualistic relationships with certain plants, such as legumes.