PART - 2 - Unit V : CH - 17 Locomotion and Movement — BIOLOGY STD 11 Science — Question

Write any four differences between Agnatha and Gnathostomata.

(i) The pelvic girdle forms part of our body. Write down four functions of the pelvic girdle.
(ii) Draw a labelled diagram of the right pelvic bone and the bones of the hind limb.

Write any four differences in the cortex of monocotyledon and dicotyledon stem.

The process to standardize the naming of living organisms is called nomenclature. Obviously, the nomenclature is only possible when the organism is described correctly and we know to what organism the name is attached to this is identification. The system of providing scientific name with two components is called Binomial Nomenclature. The scientific name ensures that each organism is identified by only one name all across the world. They also ensures that such a name has not been used for any other known organism. Scientific names for plants are provided in ICBN and for animals, in ICZN.

(1). Who proposed binomial nomenclature?
(A) Carolus Linnaeus  (B) Charles Darwin  (C) Francis crick  (D) Albert Einstein

(2)Which of the following is an example of binomial scientific name?
(A) Green algae  (B) Rana tigrina  (C) Snow leopard  (D) China rose

(3). In binomial nomenclature, the name of organism consists of
(A) kingdom   (B) genus   (C) species   (D) Both B and C

(4). ICBN stands for
(A) Internal botanical congress names
(B) International center of botanical names
(C) International code of botanical nomenclature
(D) Internal code of botanical nomenclature

(5). In binomial nomenclature,------- epithet starts with small letter
(A) Genus
(B) Species
(C) Both A and B
(D) None of the above

The conifer forests of the world cover huge areas of land and provide the largest terrestrial carbon sink. Conifers are also valued economically; their softwood is used for the production of timber, they are used to cultivate pine nuts, and the berries of the juniper bush are used to flavour gin. As in all other vascular plants, gymnosperms have a sporophyte dominant life cycle (the sporophyte is the diploid multicellular stage, which comprises the body of the plant, i.e., a leafy tree).The gametophyte phase is relatively short, and sees gametes produced on the reproductive organs.

(1) For a plant species to be 'dioecious', it must:
(a) Reproduce asexually
(b) Have both male and female organs
(c) Have separate male and female individuals
(d) Not reproduce

(2) Which division of the gymnosperms is most commonly used to create paper?
(a) Conifers  (b) Cycads  (c) Gnetophyta  (d) Gingkophyta(3) What role does the cone have in the gymnosperm life cycle?
(a) It is the seed
(b) It is the male gametophyte
(c) It is the reproductive body
(d) It feeds the embryo

(4) Conifers are adapted to tolerate extreme environmental conditions because of
(a) broad hardy leaves.
(b) superficial stomata.
(c) thick cuticle
(d) presence of vessel(5) Cycas and Adiantum resemble each other in having:
(a) seeds  (b) motile sperms  (c) cambium  (d) vessels

Write any four economic importance of Pteridophyta.

Cell membrane, also called plasma membrane, thin membrane that surrounds every living cell, delimiting the cell from the environment around it. Enclosed by this cell membrane are the cell’s constituents, large, water-soluble, highly charged molecules such as proteins, nucleic acids, carbohydrates, and substances involved in cellular metabolism. Cell membranes are composed primarily of fatty-acid based lipids and proteins. Membrane lipids are principally of two types, phospholipids and sterols (generally cholesterol). Both types share the defining characteristic of lipids—they dissolve readily in organic solvents—but in addition they both have a region that is attracted to and soluble in water.

(1).Plasma membrane is made up of
(a) A protein, a lipid and a cellulose layer
(b) Bimolecular lipid layer surrounded by protein layers
(c) A protein layer between two lipid layers
(d) A lipid layer between two protein layers

(2) Fluid mosaic model of cell was put forward by –
(a) Danielli and Dawson
(b) Singer and Nicolson
(c) Garner and Allard
(d) Watson and Crick

(3) Which of the following statements best describes the chemical composition of
plasma-membrane?
(a) Plasma membrane is composed of two layers—one layer of phospholipids and one layer
of proteins.
(b) Plasma membrane is composed of equal numbers of phospholipids, proteins, and
carbohydrates.
(c) Plasma membrane is bilayers of proteins with associated lipids and carbohydrates.
(d) Plasma membrane is bilayers of phospholipids with associated proteins and
carbohydrates.

(4) Most abundant lipid in the cell membrane is
(a) phospholipids (b) cerebrosides (c) glycolipids (d) None of these

Explain the differences between dorsiventral leaf and isobilateral leaf.
Difference between the cortex of mono- cotyledon and dicotyledon stem:

Write any four differences between afferent arteriole and efferent arteriole.