Correct Answer: C) auxin, cytokinin and gibberellins

Explanation

Fruit enlargement is a process that can be induced by spraying young ovaries with certain plant hormones. The question is asking which hormones are responsible for this process. The options that are provided are gibberellins, ethylene, and abscisic acid (option A), auxin, abscisic acid, and ethylene (option B), auxin, cytokinin, and gibberellins (option C), and auxin, kinin, and gibberellin (option D). Out of the four options, the correct answer is option C, which states that fruit enlargement can be induced by spraying young ovaries with auxin, cytokinin, and gibberellins. Auxin is a plant hormone that promotes cell elongation and division, cytokinin is a hormone that promotes cell division and differentiation, and gibberellins are hormones that promote stem elongation and fruit growth. Spraying young ovaries with these hormones can cause the fruit to grow larger and ripen faster. This process is commonly used in agriculture to increase fruit yield and improve the quality of crops. It is important to note that different plant hormones have different effects on plant growth and development. For example, abscisic acid is a hormone that promotes seed dormancy and helps plants cope with environmental stress, while ethylene is a hormone that promotes fruit ripening and leaf senescence. To learn more about plant hormones and their effects on plant growth and development, please see the relevant sections of the recommended textbooks.

Correct Answer: B. reality

Correct Answer: D. inbreeding

Correct Answer: A. matured / mature

Correct Answer: A. III and I

Correct Answer: B. public service

Correct Answer: A. excusable

Correct Answer: B. inherited from his father

Correct Answer: B. 24cm²

Explanation

Area of shaded part = 2 x area of \(\bigtriangleup\)SPQ

= 2 x \(\frac{1}{2}\) 8 x 3 =24cm

Hence, area of the unshaded part of the rectangle = area of rectangle - area of shaded part

= 8 x 6 - 24

= 48 - 24

= 24 cm\(^2\)

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.