BIOLOGY M.C.Q (1 Marks)

(b) Diffusion
Explanation: The main function of the respiratory system is the gaseous exchange. This refers to the process of Oxygen and Carbon Dioxide moving between the lungs and blood. Diffusion occurs when molecules move from an area of high concentration (of that molecule) to an area of low concentration. This occurs during the gaseous exchange as the blood in the capillaries surrounding the alveoli has a lower oxygen concentration of Oxygen than the air in the alveoli which has just been inhaled.

(c) All of these
Explanation: If the anaemic person suffered from massive haemorrhage, the problem he may face includes very low blood pressure, accumulation of wastes products in the body, and no glomerular filtration in the kidney.

(c) Lower part of capsule
Explanation: The sporophyte of moss is differentiated into three parts foot, seta, and capsule. The capsule, in turn, is differentiated into 3 regions.
i. Apophysis - the sterile basal portion of the capsule, it is in continuity with seta
ii. Theca or body of capsule, which is the fertile region, and
iii. Operculum the apical region of capsule.
Apophysis is rich in chloroplast and thus the photosynthetic region of moss, it also provides nutrition to the developing sporangium.

(a) Gibberellins
Explanation: Gibberellins are growth hormones that stimulate cell elongation and cause plants to grow taller. Gibberellins also have a role in other plant processes, such as stem elongation, germination, flowering, and fruit ripening.

(b) Ureotelic
Explanation: Excretion of urea as metabolic waste is known as Ureotelism. Animals secreting urea are called ureotelic. Frog is ureotelic.

(d) Neurohypophysis
Explanation: An excessive loss of fluid from the body can activate receptors that stimulate the hypothalamus to release antidiuretic hormone (ADH) or vasopressin from the neurohypophysis.

(c) Medulla oblongata and pons
Explanation: A specialized centre present in the medulla region of the brain called respiratory rhythm centre is primarily responsible for this regulation. In the pons region of the brain called pneumotaxic centre can moderate the functions of the respiratory rhythm centre.

(b) Cutinized epidermal wall, conjoint vascular bundle, and narrow cortex
Explanation: The stem shows the epidermis covered with a thin layer of cuticle, narrow cuticle, and each vascular bundle is conjoint, open, and is endarch protoxylem.

(b) Two ends
Explanation: Two ends the carboxyl and amino-terminal.

(c) Distal convoluted tubule
Explanation: Each nephron consists of Bowman's cup, tubules, and loops of Henle's. The filtration of blood occurs in glomerulus cells present in Bowman's cup. Some materials are added to the initial filtrate in the distal convoluted tubule.

(d) Fossils
Explanation: Dead remains of plants or animals or their impressions are called fossils. Fossils help in classification of an organism that evolved in the different interval of time in history.