Question 1
In evolution, analogous structures are significant because they show
Options
A) physiological diversity
B) functional diversity
C) genetic diversity
D) structural diversity
The correct answer is A.
Explanation:
In
evolutionary biology, the term analogous structures pertain to the
various structures in different species having the same function but
have evolved separately, thus do not share common ancestor.
In
comparison, the homologous structures pertain to the structures that
show similar morphology and anatomy but have different functions.
Moreover, the homologous structures are believed to have evolved from a
common ancestor since they show similar development pattern during
embryonic development.
Question 2
Which of the following statements reflects the mechanism of natural selection?
Options
A) There are variations within every species
B) Individuals of every species are genetically identical
C) No organism in a species dies before sexual maturity
D) Organisms with selective advantages are less likely to survive
The correct answer is A.
Explanation:
Natural selection is the process whereby organisms better adapted to their environment tend to survive and produce more offspring. The theory of its action was first fully expounded by Charles Darwin, and it is now regarded as be the main process that brings about evolution.
Question 3
Which of the following animals exhibits territoriality?
Options
A) Rabbit
B) Earthworm
C) Lizard
D) Toad
The correct answer is C.
Explanation:
Territoriality is a type of intraspecific or interspecific competition that results from the behavioral exclusion of others from a specific space that is defended as territory. This well-defined behavior is exhibited through songs and calls, intimidation behavior, attack and chase, and marking with scents.
Question 4
The branch of Biology that deals with the principles of classification of organisms is known as
Options
A) biological index
B) nomenclature
C) taxonomy
D) ecology
The correct answer is C.
Explanation:
Taxonomy is the science of defining groups of biological organisms on the basis of shared characteristics and giving names to those groups.
Question 5
Which of the following structures is a tissue
Options
A) Vessel element
B) Blood
C) Sieve tube element
D) Erythrocyte
The correct answer is B.
Explanation:
In biology, tissue is a cellular organizational level intermediate between cells and a complete organ. A tissue is an ensemble of similar cells from the same origin that together carry out a specific function. Organs are then formed by the functional grouping together of multiple tissues.
Question 6
Which of the following cells are not regarded as specialized?
Options
A) Sperm cells
B) Root up cells
C) Muscle cells
D) Somatic cells
The correct answer is D.
Explanation:
Some cells in multicellular organisms are modified to carry out a particular function, such as transporting a certain substance or executing a specific task. These cells are called specialized cells. A somatic or vegetal cell is any biological cell forming the body of an organism; that is, in a multicellular organism, any cell other than a gamete, germ cell, gametocyte or undifferentiated stem cell.
Question 7
Which of the following pairs of cells carry out the same function?
Options
A) Check cell and red blood cell
B) Spermatozoon and ovum
C) Palisade cell and epidermal cell
D) Root tip cell and guard cell
The correct answer is B.
Explanation:
A
spermatozoon is a motile sperm cell, or moving form of the haploid cell
that is the male gamete. A spermatozoon joins an ovum to form a zygote.
A zygote is a single cell, with a complete set of chromosomes, that
normally develops into an embryo.
The egg cell, or ovum, is the
female reproductive cell gamete in oogamous organisms. The egg cell is
typically not capable of active movement, and it is much larger (visible
to the naked eye) than the motile sperm cells. When egg and sperm fuse,
a diploid cell (the zygote) is formed, which rapidly grows into a new
organism.
Question 8
If Amoeba is placed in a salt solution. the contractile vacuoles would
Options
A) be bursting more frequently
B) be more numerous
C) be formed less frequently
D) grow bigger before they burst
The correct answer is C.
Question 9
In which of the following habitats is paramecium not found?
Options
A) Pond
B) Aquarium
C) Lake
D) Puddle
The correct answer is B.
Question 10
The following processes are involved in water movement in the endodermis except
Options
A) osmosis
B) vacuolar pathway
C) diffusion
D) active transport
The correct answer is C.
Question 11
Cells that utilise a lot of energy are characterized by the presence of a large number of
Options
A) vacuoles
B) mitochondria
C) endoplasmic reticulum
D) ribosomes
The correct answer is B.
Question 12
The parts labelled X in the diagram are
Options
A) centriole
B) chloroplast
C) chromatid
D) tonoplast
The correct answer is C.
Explanation:
Chromatid is each of the two thread-like strands into which a chromosome divides longitudinally during cell division. Each contains a double helix of DNA.
Question 13
The diagram above represents
Options
A) nucleolus
B) centromere
C) centriole
D) spindle
The correct answer is D.
Explanation:
Spindle fibers form a protein structure that divides the genetic material in a cell. The spindle is necessary to equally divide the chromosomes in a parental cell into two daughter cells during both types of nuclear division: mitosis and meiosis. During mitosis, the spindle fibers are called the mitotic spindle.
Question 14
Secondary growth is brought about by the activities of the
Options
A) phellogen and phelloderm
B) phellogen and procambium.
C) vascular cambium and phelloderm
D) vascular cambium and phellogen
The correct answer is D.
Question 15
A monocot root is different from a dicot root by having
Options
A) endodermis
B) cambium
C) wide pith
D) root hair.
The correct answer is C.
Question 16
Which of the following statements best describes haemoglobin? It is
Options
A) yellowish in colour
B) a red blood cell
C) an oxygen carrying pigment
D) needed for blood clotting
The correct answer is C.
Question 17
Inhaled air is made warm and moist in the
Options
A) epiglottis
B) nasal cavity
C) trachea
D) mouth
The correct answer is B.
Question 18
Which of the following structures is not involved in respiration?
Options
A) Lung books
B) Mouth
C) Stomach
D) Trachea
The correct answer is C.
Question 19
Filtrate in the Bowman's capsule contains vitamins because
Options
A) only all the amount is required by the body
B) they can be reabsorbed into the blood
C) they have low molecular weight
D) most of them are fat soluble.
The correct answer is C.
Question 20
Pore sweat is produced during muscular exercise because
Options
A) the contracting muscles produce water
B) fermentation occurs in muscles
C) the temperature of the body rises
D) the muscle fatigues
The correct answer is C.