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Biology & Geology

Chapter 1 - Support and Movement in Living Organisms

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Chapter 2 - Hormonal Coordination in Living Organisms

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Chapter 3 - Reproduction in Living Organisms

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Chapter 4 - Immunity in Living Organisms

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Chapter 5 - Molecular Biology - DNA Structure and Function

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Chapter 6 - Molecular Biology - RNA, Protein Synthesis and Genetic Engineering

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Chapter 7 - Geology, Earth Sciences and Ecology

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Quiz

Lesson 2 Quiz: Reproduction in Flowering Plants (Angiosperms)

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1.
The enzyme extracted from RNA viruses and used to convert mRNA into a single strand of complementary DNA (cDNA) is:
Reverse transcriptase
RNA polymerase enzyme
Palace enzyme
Ligase enzyme
2.
When dilute hydrochloric acid is added to a solid salt, a gas is evolved with a pungent odor that turns acidified potassium dichromate paper green while a colloidal yellow precipitate of sulfur separates in the reaction vessel. The anion is:
Sulfite (SO32−)
Sulfate (SO42−)
Thiosulfate (S2O32−)
Sulfide (S2−)
3.
The pituitary gland is considered the master of the endocrine glands (the maestro) because:
It secretes stimulating hormones that control the secretions of most other endocrine glands in the body, such as the thyroid, adrenals, and gonads
Secretes digestive enzymes
Connected to the liver
The largest gland by weight
4.
According to the 2026/2027 Egyptian STEM biology syllabus, what is the exact scientific deduction regarding: Chargaff's Rules of DNA Base Pairing?
In any double-stranded DNA molecule, the percentage of Adenine equals Thymine (%A = %T) and Guanine equals Cytosine (%G = %C), with purines equaling pyrimidines
The percentage of %A + %T always equals 50% in all organisms
Adenine bonds with Guanine via three hydrogen bonds
Uracil replaces Thymine in the double helix of nuclear DNA
5.
The percentage of DNA encoding the construction of proteins and enzymes in the genetic content of eukaryotic cells (such as humans) represents approximately:
More than 90%
Less than 2% Of the total cell genome
100%
50%
6.
The hormone that is secreted from the stomach lining and travels through the blood to return to the same stomach, stimulating it to secrete its digestive gastric juices, is:
Gastrin hormone
Pepsin hormone
Cholecystokinin hormone
Secretin hormone
7.
The two hormones that are secreted from the mucous membrane of the small intestine to stimulate the pancreas to secrete its digestive juices are:
Secretin and cholecystokinin (Secretin & CCK)
Insulin and glucagon
Thyroxine and calcitonin
Prolactin and oxytocin
8.
Solid ionic compounds such as crystal NaCl do NOT conduct electricity in the solid state because:
Their ions are tightly locked in fixed positions within the rigid crystal lattice and cannot move freely
Electrons are moving too rapidly
They contain no electrical charges
They decompose in the presence of air
9.
Antidiuretic hormone (ADH/vasopressin) works to raise blood pressure by:
Smooth blood vessel constriction and water reabsorption in nephrons
Expansion of the arteries
Sodium excretion in urine
Stimulate sweat
10.
Which of the following oxides is classified as an amphoteric oxide that reacts with both acids and bases to yield salt and water?
Sodium oxide (Na2O)
Sulfur trioxide (SO3)
Carbon dioxide (CO2)
Aluminum oxide (Al2O3)
11.
Sertoli cells in the seminiferous tubules of the human male testicle play a functional role in:
The secretion of a fluid that nourishes sperm inside the testicle and is thought to have an immunological function
Secretion of testosterone
Meiosis to produce precursors
Excretion of fructose
12.
Magnetic iron oxide (Magnetite, Fe3O4) is chemically considered a mixed oxide because reacting it with hot concentrated sulfuric acid yields:
A mixture of iron(II) sulfate, iron(III) sulfate, and water vapor
Iron(III) sulfate only
Elemental iron and sulfur dioxide
Iron(II) sulfate and hydrogen gas only
13.
Rotational cytoplasmic movement inside living plant cells (such as Elodea plants) is indicated by:
Movement of chloroplasts immersed in the cytoplasm stream in a constant rotational direction
Stomata open
Mitochondrial division
Change in cell wall thickness
14.
The adrenal medulla is stimulated to secrete the emergency hormones adrenaline and noradrenaline via:
ACTH hormonal stimulation
Rapid and direct sympathetic nervous stimulation in cases of fear, fight, and flight
Body temperature change
High blood sugar
15.
Artificial parthenogenesis in flowering plants (such as the production of seedless oranges or watermelons) is carried out by:
Irradiating seeds with X-rays
Spraying flower stigmas with pollen extract or indole acetic acid to stimulate the ovary to form fruit without fertilization
Pen vaccination
Tissue culture
16.
The gland that secretes both external ductal secretion and non-ductal hormonal secretion directly into the blood is:
pituitary gland
Adrenal gland
Thyroid gland
Pancreas (common/mixed gland)
17.
A hormone secreted from the anterior lobe of the pituitary gland that stimulates the growth of Graafian follicles in the female ovary and the production of sperm in the male testicle is:
ACTH hormone
follicle stimulating hormone (FSH)
Luteinizing hormone (LH)
Prolactin hormone
18.
If the tangent to y = x2 - 4x + 5 is parallel to the x-axis, the point of tangency is:
(0, 5)
(2, 0)
(2, 1)
(4, 5)
19.
Combined contraceptive pills are considered an effective method because they:
It contains synthetic hormones similar to estrogen and progesterone that inhibit the secretion of FSH and LH from the pituitary, thus preventing the maturation of eggs and the occurrence of ovulation.
The fallopian tubes close mechanically
It kills sperm
Placental abruption
20.
Auxins in plants (such as indole acetic acid (IAA)) are chemicals secreted from:
The growing tops and live plant buds are active and move to the response areas
Cork cells
Pollen granules only
Dead wood cells
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