Biology (2017) | Study Mode

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Question 21
Biology (2017) Q 21 image
A

rat

B

dog

C

sheep

D

man

Explanation

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Correct option: D
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Question 22
A
half inferior ovary
B
superior ovary
C
inferior ovary
D
half superior ovary
Explanation
A superior ovary is an ovary attached to the receptacle above the attachment of other floral parts
A half-inferior ovary is embedded or surrounded by the receptacle.

An inferior ovary lies below the attachment of other floral parts.

Correct option: B
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Question 23
A
Holozoic
B
parasitic
C
saprohytic
D
carnivores
Explanation
Parasitic nutrition is heterotrophic nutrition where a parasitic organism lives on the body surface or inside the body of another type of organism (a host) and gets nutrition directly from the body of the host. Since these parasites derive nourishment from their host, this symbiotic interaction is often described as harmful to the host.
Saprotrophic nutrition is a process of chemoheterotrophic extracellular digestion involved in the processing of decayed organic matter.

The organism feeds on dead matter i.e fungi
A carnivore is an organism that derives its energy and nutrient requirements from a diet consisting mainly or exclusively of animal tissue, whether through predation or scavenging

Correct option: B
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Question 24
A
Volvox
B
paramecium
C
euglena
D
chlamydomonas
Explanation
Volvox is an example of organism thatforms spherical colonies of up to 50,000 cells.
A colony is composed of two or more individuals living in close association with, or connected to, one another, usually for mutual benefit such as stronger defense or the ability to attack bigger prey.

It is a cluster of identical cells (clones) on the surface of (or within) a solid medium, usually derived from a single parent cell.

Correct option: A
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Question 25
A
size
B
ability to taste PTC
C
color
D
fingerprint
Explanation
Morphological variation includes aspects of the outward appearance i.e shape, structure, color, pattern, size which is in contrast to physiology variation which deals primarily with function.

Morphological variation arises from a number of factors which can be bluntly classified as either genetic or environmental implanted into the process of evolution.

Correct option: B
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Question 26
A
acquired
B
heritable
C
sex-linked
D
morphological
Explanation
PTC(phenylthiocarbamide) has the unusual property that it either tastes very bitter or is virtually tasteless, depending on the genetic makeup of the taster. The ability to taste PTC is often treated as a dominant genetic trait, although inheritance and expression of this trait are somewhat more complex.

To some people, small amounts of the compounds phenylthiocarbamide (PTC) taste very bitter; other people do not taste these compounds. The myth is that there are only two kinds of people, tasters and non-tasters, and that the trait is controlled by a single gene, with the allele for tasting dominant over the allele for non-tasting.
? ability to taste PTC in some individuals is a character that is heritable

Correct option: B
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Question 27
A
coagulation, white bloodcell
B
coagulation, water
C
white blood cells, red blood cell
D
coagulation, red blood cell
Explanation
The clumping of cells such as bacteria or red blood cells in the presence of an antibody or complement.

During blood transfusions, the antibodies react with the transfused blood group(if its of different blood group), the erythrocytes clump up and stick together causing them to agglutinate

Correct option: D
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Question 28
A
Chloroplasts
B
Ribosomes
C
Cytoplasm
D
Mitochondria
Explanation
Chloroplast is the combination of two biological terms, plastid (an organelle in a plant cell), and chloros, which means green. chlorophyll which is an important pigments for photosynthesis.

A ribosome is a complex cellular mechanism used to translate genetic code into chains of amino acids. Long chains of amino acids fold and function as proteins .

The jellylike material that makes up much of a cell inside the cell membrane, and, in eukaryotic cells, surrounds the nucleus.

Mitochondrial is a spherical or elongated organelle in the cytoplasm of nearly all eukaryotic cells, containing genetic material and many enzymes important for cell metabolism, including those responsible for the conversion of food to usable energy

Correct option: A
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Question 29
A
they can be seen under microscope
B
they range from 0.5 m in diameter
C
They are grouped accordingly to their cell shape
D
they so not cause disease
Explanation

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Correct option: A
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Question 30
A
organ
B
system
C
cell
D
tissue
Explanation
In unicellular organisms, the single cell performs all life functions. Examples are Amoeba, Euglena
Life can be organised into several different levels of function and complexity.

These functional levels are: cells, tissues, organs, systems and organisms.
Every living thing is made up of a cell or a number of cells.

Correct option: C

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