Correct Answer: B. wind vane

Explanation

Wind direction is usually measured using a wind vane.

Explanation

(a) Sensory cells are specialised cells which receive a particular stimulus. Normally they convert stimuli into impulses and transmit such impulses or sensation to the brain or spinal cord or central nervous system.

(b) (i) The function of lens is that it reflects rays or makes fine adjustment to focus object on the retina

(ii) Vitreous humour reflects light rays onto the retina or helps maintain spherical shape of the eye

(iii) Optic nerve transmits sensory impulses to the brain or transmits sensory impulses from the brain

(c )(i) The four structures which protect the eye against injury are

(1) Eye lids

(2) Eye lashes

(3) Eye socket or bonying socket

(4) conjunctive.

The eye lid is closed to protect the eye from foreign particles or mechanical injury. During blinking it carries water from the tear glands to moisten or irrigate the eye with tear or water to keep it moist. Eye lashes also acts as a hood and protects the eye from glare or excessive light. It also shields the eye against sweat, water or dust. Conjunctiva provides protective shield to the inner most delicate structure and gets inflamed during infection instead of the entire eye. Eye socket houses or encloses the eye balls. It shields or gives protection from mechanical injury, e.g. from a blow.

(d) In a dark room, the iris contracts while the pupil dilates or opens widely to allow in more light. On sudden exposure to bright sun-light, the pupil which is still wide open allows in too much light which bleaches pigment in the rod cells and this causes the dazzling sensation experienced. The iris muscle gradually relaxes within a few seconds. The pupil constricts gradually to regulate the entry of the required amount of light for the vision to return to normal.

Correct Answer: C. auxin

Correct Answer: C. cytoplasm and nucleus

Correct Answer: D) mitochondrion

Explanation

In Biology, respiration is the process by which cells produce energy. The question is asking us which organelle is responsible for tissue respiration. The options given are endoplasmic reticulum, ribosome, golgi body, and mitochondrion. The correct answer is Option D, mitochondrion. Mitochondria are often referred to as the powerhouses of the cell because they are responsible for producing most of the energy required by cells. They do this by breaking down glucose and other nutrients through a process called cellular respiration. This process takes place in the mitochondria and generates energy in the form of ATP. The other options given, such as endoplasmic reticulum and golgi body, are also important organelles in the cell, but they are not directly involved in tissue respiration. The ribosome is responsible for protein synthesis, not energy production. It's important to understand the functions of different organelles in the cell to have a good grasp of how cells work. Mitochondria are involved in various cellular processes, including cell signaling, cell differentiation, and cell death. For more information on this topic, please see the recommended textbooks.

Correct Answer: A) it must be thick but permeable

Explanation

This question is asking about the characteristics of respiratory surfaces, which are the parts of the body responsible for exchanging gases with the environment during breathing. The question is asking which of the following characteristics is NOT generally true for these surfaces. Option A states that respiratory surfaces must be thick but permeable. However, this option is the correct answer because respiratory surfaces are actually thin and permeable to allow for efficient gas exchange. Option B states that respiratory surfaces must be moist, which is true because moisture helps gases dissolve and diffuse across the surface. Option C states that respiratory surfaces must possess a large surface area, which is also true because a larger surface area allows for more efficient gas exchange. Option D states that respiratory surfaces must be richly supplied with blood vessels, which is also true because blood vessels help transport gases to and from the surface. Therefore, the correct answer is option A, which incorrectly states that respiratory surfaces must be thick but permeable. In summary, respiratory surfaces are thin, moist, possess a large surface area, and are richly supplied with blood vessels. To learn more about this topic, please read the relevant sections of the recommended textbooks.

Correct Answer: A. alcohol

Correct Answer: B. EE, EE, Ee, and Ee

Explanation

The labels I, II, III and IV represent the genotypes of the offspring from a cross between two heterozygous parents (Ee). I and II represent the homozygous dominant (EE) and heterozygous (Ee) offspring, respectively, while III and IV represent the heterozygous (Ee) and homozygous recessive (ee) offspring, respectively.

Correct Answer: C. produces short-term changes

Correct Answer: B. Seminal vessicles