The eye defect caused by an uneven curvature of the cornea or lens or both is
myopia
presbyopia
astigmatism
hypermetropia
Correct answer is C
Astigmatism is a common refractive error of the eye that occurs when the cornea or lens has an irregular shape. In a normal eye, the cornea and lens have a smooth, evenly curved surface, similar to a sphere. However, in astigmatism, the cornea or lens may be more curved in one direction than the other, resulting in a refractive error.
Stunted growth and small yellow leaves in plants are symptoms of the deficiencies of
nitrogen
iron
sulphur
magnesium
Correct answer is B
Iron deficiency in plants leads to chlorosis, which is the yellowing of leaves. Chlorosis occurs because iron is necessary for the formation of chlorophyll, which is the green pigment in plants that absorbs light energy for use in photosynthesis. Without sufficient iron, the plant cannot produce enough chlorophyll, leading to yellow leaves. Stunted growth is also a symptom of iron deficiency as iron is essential for various metabolic processes including DNA synthesis.
An example of a process that involves osmosis is the
movement of water from root hairs into cortical cell
reabsorption of food nutrients from the kidney into blood capillaries
translocation of starch from leaves to all parts of a plant
movement of digested food from ileum into blood capillaries
Correct answer is A
Movement of water from root hairs into cortical cells involves osmosis. When a plant's roots absorb water from the soil, it passes through the root hairs and moves into the cortical cells (which are part of the root's inner layer) through osmosis. This osmotic movement of water helps maintain water balance and nutrient distribution within the plant.
Which of the following characteristics shows discontinuous variation in plants?
flower colour
Leaf size
plant height
fruit size
Correct answer is A
Colour of flower: The colour of flowers in plants typically shows discontinuous variation. Flowers can have specific colors like red, blue, yellow, or white, and individuals within a population will usually exhibit one of these distinct flower colors. There are no intermediate or blending colors between the different categories.
Placentation in fruits is referred to as the
arrangement of ovules in the ovary of a flower
part of the ovary where the ovules originate and remain till maturity
ovules borne on a central column of tissues in an ovary
formation of a single carpel joined at the two edges of an ovule
Correct answer is A
Placentation in fruits refers to the arrangement of ovules within the ovary of a flower, and it is directly related to seed development and fruit formation.
Study the list of organisms below and use them to answer the questions.
I-Hydra
II-Owl
III-Snake
IV-Snail
The Phylum of the organism labeled IV is
Platyhelminthes
mollusca
Arthropoda
Coelenterata
Correct answer is B
The organism labelled IV is a Snail. Snails belong to the Phylum Mollusca. This phylum is characterized by soft-bodied animals that usually have an external shell, like snails, clams, and squids.
Study the list of organisms below and use them to answer the questions.
I-Hydra
II-Owl
III-Snake
IV-Snail
The arrangement of the organisms in order of increasing complexity is
II-III-I-IV
I-IV-III - II
I-II-III-IV
IV-III-II - I
Correct answer is B
The arrangement of organisms in order of increasing complexity is Hydra (a simple multicellular organism), Snail (a more complex invertebrate), Snake (a simple vertebrate), and Owl (a more complex vertebrate). This is because as we move from invertebrates to vertebrates, the level of organization and complexity increases. The complexity of an organism can be determined by its level of organization, from cellular to tissue to organ to system level.
The diagram below is an illustration of a structure in the skeletal system of humans. Study it and answer the question.
Clavicle, tongue, and pelvis
Eye, cerebellum, and ear
Ear, brain, and hinge joint
Lumbar, eye, and teeth
Correct answer is B
No explanation has been provided for this answer.
The diagram below is an illustration of a structure in the skeletal system of humans. Study it and answer the question
The illustrated structure is a part of the
appendicular skeleton
axial skeleton
axis vertebrae
cervical vertebrae
Correct answer is B
The skull is part of the axial skeleton. It is the bony structure that forms the head and encloses and protects the brain. The skull is located along the central axis of the body, and it is one of the key components of the axial skeleton.
Which of the following soil types have a high capillarity?
Sand and clay
loam and sand
silt and sand
silt and clay
Correct answer is D
Both silt and clay particles have very small pores, which contribute to higher capillarity. When combined, the silt and clay would likely result in a soil with relatively high capillarity.
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