Q: What branch of science is the study of human origins? Read this paragraph and choose the correct option from the provided answers: Choices: - biology - pharmacology - palaeobiology - paleoanthropology A:
paleoanthropology

(Question)
Q: What occurs after gametes fuse and form a diploid zygote? Read this paragraph and choose the correct option from the provided answers: Choices: - transcription - electrolysis - reproduction - meiosis A:
(Answer)
meiosis

Ques: Q: What do you call the regular changes in biology or behavior that occur in a 24-hour cycle? Read this paragraph and choose the correct option from the provided answers: Circadian rhythms are regular changes in biology or behavior that occur in a 24-hour cycle. In humans, for example, blood pressure and body temperature change in a regular way throughout each 24-hour day. Animals may eat and drink at certain times of day as well. Humans have daily cycles of behavior, too. Most people start to get sleepy after dark and have a hard time sleeping when it is light outside. In many species, including humans, circadian rhythms are controlled by a tiny structure called the biological clock . This structure is located in a gland at the base of the brain. The biological clock sends signals to the body. The signals cause regular changes in behavior and body processes. The amount of light entering the eyes helps control the biological clock. The clock causes changes that repeat every 24 hours. Choices: - cognitive rhythms - variable rhythms - sleep rhythms - circadian rhythms A:
Ans: circadian rhythms

(Q).
Q: Groundwater dissolves minerals and carries the ions in a what? Read this paragraph and choose the correct option from the provided answers: Groundwater dissolves minerals and carries the ions in solution. Choices: - mixture - transition - jet stream - solution A:
(A).
solution

Ques:Q: What causes polarization in a neutral object? Read this paragraph and choose the correct option from the provided answers: Charging by Induction It is not necessary to transfer excess charge directly to an object in order to charge it. Figure 18.13 shows a method of induction wherein a charge is created in a nearby object, without direct contact. Here we see two neutral metal spheres in contact with one another but insulated from the rest of the world. A positively charged rod is brought near one of them, attracting negative charge to that side, leaving the other sphere positively charged. This is an example of induced polarization of neutral objects. Polarization is the separation of charges in an object that remains neutral. If the spheres are now separated (before the rod is pulled away), each sphere will have a net charge. Note that the object closest to the charged rod receives an opposite charge when charged by induction. Note also that no charge is removed from the charged rod, so that this process can be repeated without depleting the supply of excess charge. Another method of charging by induction is shown in Figure 18.14. The neutral metal sphere is polarized when a charged rod is brought near it. The sphere is then grounded, meaning that a conducting wire is run from the sphere to the ground. Since the earth is large and most ground is a good conductor, it can supply or accept excess charge easily. In this case, electrons are attracted to the sphere through a wire called the ground wire, because it supplies a conducting path to the ground. The ground connection is broken before the charged rod is removed, leaving the sphere with an excess charge opposite to that of the rod. Again, an opposite charge is achieved when charging by induction and the charged rod loses none of its excess charge. Choices: - meaning of charges - combining of charges - signaling of charges - separation of charges A:

Ans:separation of charges

Q: How many pathways do plants have for carbon fixation? Read this paragraph and choose the correct option from the provided answers: Plants have evolved three pathways for carbon fixation. The most common pathway combines one molecule of CO 2 with a 5-carbon sugar called ribulose biphosphate (RuBP). The enzyme which catalyzes this reaction, ribulose-1,5-bisphosphate carboxylase oxygenase (nicknamed RuBisCo ), is the most abundant enzyme on earth! The resulting 6-carbon molecule is unstable, so it immediately splits into two much more stable 3-carbon phosphoglycerate molecules. The 3 carbons in the first stable molecule of this pathway give this largest group of plants the name "C-3. ". Choices: - one - four - two - three A:
three