Explanation

(a) Graph slope represents Planck's constant.

(b) Intercept OC represents work function of the metal.

(c) Intercept OK represents the threshold frequency F\(_o\) of the incident radiation

Correct Answer: A) competition

Explanation

In a community, there is a process called succession where different species replace each other over time. The question is asking about the biological association that directly contributes to this process. The options given are competition, predation, parasitism, and commensalism. Competition is the interaction between organisms that need the same resources, such as food, water, and shelter. This can lead to one organism outcompeting the other, which can indirectly affect succession by reducing the population of one species. Predation is when one organism (the predator) kills and eats another organism (the prey). This can also indirectly affect succession by reducing the population of one species and allowing other species to take its place. Parasitism is when one organism (the parasite) lives on or inside another organism (the host) and benefits at the expense of the host. This can directly affect succession by weakening the host and making it more vulnerable to other species. Commensalism is a relationship where one organism benefits and the other organism is not affected. This relationship does not contribute directly to succession. Therefore, the correct answer is competition because it directly affects the success of one species over another in the community by limiting their resources.

Correct Answer: C. prominent

Correct Answer: A. 70

Explanation

Relative Humidity= \(\frac {partial pressure of H2O}{saturated vapor pressure of H2O}\)×100%

S.v.p. of water at 40°c = 55.3

⇒ Relative Humidity= \(\frac{38.8}{55.3}\)×100%

Relative Humidity= 70%

Correct Answer: D. larynx, trachea, bronchiole, and bronchus.

Explanation

The parts labelled 1, II, III and IV respectively are larynx, trachea, bronchiole and bronchus The larynx, commonly known as the voice box, is a cartilaginous structure located in the neck, just below the pharynx and above the trachea. The trachea, also known as the windpipe, is a long tube made of C-shaped rings of cartilage that extend from the larynx to the bronchi. Bronchioles are small, narrow tubes that branch out from the bronchi. They represent the smaller airways within the lungs. The bronchi are the two main branches that arise from the lower end of the trachea, one leading to each lung.

Correct Answer: B. drought-resistant

Explanation

drought-resistant is most appropriate. Drought tolerance refers to the degree to which a plant is adapted to arid or drought conditions.

Explanation

(b)(i)Primary Production:Primary production refers to all activities that involve the extraction of raw materials from the earth or sea. Examples: farming, fishing, forestry, quarrying, mining and oil drilling, etc

(ii)Secondary Production:Secondary Production involves manufacturing and construction activities which make use of raw material to produce finished products. Examples are textiles, furniture making, vehicle assembly, basketry, weaving, tailoring, etc

(iii)Tertiary Production:Tertiary Production involves the provision of commercial activities and professional services to satisfy human wants. Examples includes, Teaching, Nursing, Banking, Insurance, Management consultancy, Auditing, Advertising, etc.

Correct Answer: D. irregularities

Correct Answer: D. plan her growth and development

Correct Answer: B. 1/3