Tag: diversity and classification in animals
Questions Related to diversity and classification in animals
.......... are the longest cells in human body.
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Nerve cells
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Epithelial cell
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Mast cell
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Kupffer cell
The tissues which cover or protect the body are called epithelial tissues. Cells of the epithelial tissues are tightly packed and have a small amount of cementing material in between them. These are small cells covering the organs and cavities of the body.
Mast cells are a type of cells belonging to areolar connective tissues. It fills the space around the organs.
Kupffer cells are star-shaped macrophages present in the liver lining.
Nerve cells possess a cell body and one or many thin fiber-like axons. Some nerve cells possess axons as long as 1 meter and thus, are the largest cell in the human body. It is also known as the longest cell in the human body. Thus, the correct answer is option A.
The ostrich egg is the largest cell known.
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True
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False
The ostrich egg is the largest cell known. These eggs are 15 cm long and 13 cm wide.
Cell size in unicellular organisms is
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0.5-10 micrometer
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1.5-2.0 micrometer
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2.5-3.0 micrometer
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3.5-4.0 micrometer
- The cell is the structural unit of life. Unicellular organisms are made up of one cell that performs all the functions. Its size is 0.5-10 micrometers, whereas, in multicellular organisms, cell size is 10-100 micrometers.
Longest cells in human body are________.
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Nerve cells.
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Bone cells.
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Leg muscle cells.
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Heart muscle cells.
Large plant cells are
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Xylem vessel cells.
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Parenchyma cells.
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Sieve tube cells.
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Sclerenchyma fibres.
Sclerenchyma, in plants, support tissue composed of any of various kinds of hard woody cells. Mature sclerenchyma cells are usually dead cells that have heavily thickened secondary walls containing lignin. The cells are rigid and nonstretchable and are usually found in nongrowing regions of plant bodies, such as the bark or mature stems. Sclerenchyma is one of the three types of ground, or fundamental, tissue in plants.Sclerenchyma fibers can be found below the epidermis of monocotyledons, organized in two or three layers of cells. They are known as cortical fibers. Thus correct option is D.
Human egg is larger than human sperm because it has
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Larger nucleus.
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More membranes.
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Core cytoplasm.
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All of the above.
Human sperm consists of a head and tail, the head carrying the genetic material and tail has mitochondria which derives the movement of sperm. It is very small in size (0.05mm) and a drop of serum contains millions of sperms. The human egg consists of genetic material along with core cytoplasm surrounding nucleus that has all the cellular components such as ribosomes, RNAs which are essential for protein synthesis and which ultimately gives rise to the whole body of an organism. Human egg measures 2cm against human sperm 0.05mm.
The smallest animal egg is that of
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Ostrich
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Human female
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Duck
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Hen
The egg size of Ostrich egg is 15cm, duck egg is typically larger than hen eggboth of which are roughly between 3-10cm. Human female egg is very small about 1-2cm and hence the smallest egg among all other options.
Largest animal cell is that of
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Ostrich.
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Duck.
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Human.
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Hen.
Efficient large-sized cells should be_________.
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Elongated.
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Branched.
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With membrane extensions.
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Any of the above.
Size of Acetobularia is
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$10cm$
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$10mm$
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$1.0mm$
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$0.1mm$
Acetabularia is a single-celled eukaryotic photosynthetic green alga. Although it is single cells it has a complex structure with size varying from 0.5-10cm. It is divided into three anatomical parts with basal rhizoid like structure resembling roots, long stalk-like structure and top umbrella that may fuse to form the cap.