How well do you understand living things and their vital processes? Whether you are preparing for JAMB, WAEC, NECO and Post-UTME, these Biology past questions and answers cover such subjects as the chemistry of life, botany, evolution, genetics, ecology etc to help you know what to expect, improve your speed and confidence and be really prepared for the actual aptitude test.
The correct pathway for blood flow from the heart to the tissues of mammals is?
heart-arteriole-artery-tissues
heart-artery-arteriole-tissues
heart-vein-venule-tissues
heart-venule-vein-tissues
Correct answer is B
Arteries carry blood away from the heart and veins carry blood back to the heart.
Arteries transport blood away from the heart and branch into smaller vessels, forming arterioles. Arterioles distribute blood to capillary beds, the sites of exchange with the body tissues. Capillaries lead back to small vessels known as venules that flow into the larger veins and eventually back to the heart.
25%
100%
50%
0%
Correct answer is B
If a woman is colorblind, that means she has the nonworking gene on both X chromosomes.
Since sons almost always get their only X chromosome from their mom, chances are they will be colorblind too.
The structure that joins the two strands of a chromosome together is the?
spindle
cellulose
centromere
chromatid
Correct answer is C
Centromeres are chromosomal regions that mediate kinetochore assembly and spindle attachment during cell division.
Gaseous exchange in annelids is more advanced and efficient compared to flatworms because?
the cells of their epidermis have no blood capillaries
they have well developed respiratory structures
their cylindrical shape gives high surface area to volume ratio
their surface area to volume ratio is very low
Correct answer is C
In simple organisms, such as cnidarians and flatworms, every cell in the body is close to the external environment.
Their cells are kept moist and gases diffuse quickly via direct diffusion. Flatworms are small, literally flat worms, which “breathe” through diffusion across the outer membrane.
Annelids have a closed circulatory system; the blood is entirely contained in vessels.
Annelids have no lungs, although many species have simple gills.
The movement of sugars from the leaf to other parts of plant is?
guttation
transpiration
transportation
translocation
Correct answer is D
Translocation is the movement of materials in plants from the leaves to other parts of the plant.
Nutrients, mainly sugars, are created in the leaves during photosynthesis. These are then transported throughout the plant through phloem, which are a long series of connected cells.