There are thousands of different eubacteria or 'true bacteria'. T… - Vidyadip

Question

There are thousands of different eubacteria or 'true bacteria'. They are characterized by the presence of a rigid cell wall, and if motile, a flagellum. The cyanobacteria (also referred to as blue-green algae) have chlorophyll a similar to green plants and are photosynthetic autotrophs. The cyanobacteria are unicellular, colonial or filamentous, freshwater/marine or terrestrial algae. The colonies are generally surrounded by gelatinous sheath. They often form blooms in polluted water bodies. Some of these organisms can fix atmospheric nitrogen in specialized cells called heterocysts, e.g., Nostoc and Anabaena. Chemosynthetic autotrophic bacteria oxidise various inorganic substances such as nitrates, nitrites and ammonia and use the released energy for their ATP production. They play a great role in recycling nutrients like nitrogen, phosphorous. iron and Sulphur.

(1) Which of the following can be termed as 'Photosynthetic Autotrophs'
(a) All monerans (b) Chemosynthetic Bacteria (c) Cyanobacteria (d) All Eubacteria

(2) Blue green algae are characterized by :
(a) They often form blooms in polluted water bodies.
(b) Some of these organisms can fix atmospheric nitrogen
(c) Their colonies are generally surrounded by gelatinous sheath.
(d) All of these

(3) Which is incorrect about Heterocysts:
(a) These are specialized cells
(b) These are present in all Cyanobacteria.
(c) Nostoc and Anabaena have Heterocysts.
(d) Organisms having these cells can fix atmospheric nitrogen

(4) Green plants are similar to Blue green algae in having:
(a) chlorophyll a (b) Heterocysts (c) chlorophyll b (d) None of these

(5) Which of these can be described as ‘true Bacteria’.
(a) Cyanobacteria only
(b) Only Chemosynthetic autotrophic bacteria
(c) Bacteria without cell wall.
(d) Eubacteria

✓

Answer

(1 - C), (2 - D), (3 - B), (4 - A), (5 - D)

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "4 Marks Questions" from Biological Classification→Biological Classification — all question types→BIOLOGY STD 11 Science question papers→Rajasthan Board STD 11 Science question papers→Rajasthan Board question paper generator→

Similar questions

Make a labeled diagram of Singer and Nicolson improved model of the structure of cell membrane and briefly describe it.

Muscles and nerve fibers allow a person to move their body and enable the internal
organs to function. There are more than 600 muscles in the human body. A kind of
elastic tissue makes up each muscle, which consists of thousands, or tens of thousands,
of small muscle fibers. Each fiber comprises many tiny strands called fibrils.
Impulses from nerve cells control the contraction of each muscle fiber. A muscle’s
strength depends mainly on how many fibers are present.

(1). Major protein constituent of muscle fibre is
(a)Actin (b)Tropomyosin (c)Myosin (d)Calnexin

(2).Myofibrils show dark and light band in
(a) cardiac muscle
(b) Striped muscle
(c) cardiac muscle and unstriated muscle
(d) cardiac muscle and striped muscle

(3). Unstriped muscle present in the
(a) Intestinal muscle (b) Leg muscle (c) Muscle of fore limb (d) Heart muscle

(4). Which of the following muscle gets into fatigue very early
(a) Skeletal muscle (b) Smooth muscle (c) Cardiac muscle (d) All the above

(5). The structural and functional unit of the striated muscle fibre is called
(a) Sarcolemma (b) Sarcomere (c) Sarcoplasm (d) Myofibril

Differentiate between
Aerobic respiration and Fermentation

Write any four differences between sympathetic and parasympathetic nervous system. Make a labelled diagram showing the nerve endings and synapses.

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

Polysaccharides or the macro molecules consisting of long chains of sugar. Only carbohydrates they are not sweet and are insoluble in water. The two ends of the polysaccharide chain are called reducing and non-reducing ends. Based upon their monomeric units these are homo polysaccharides or heteropolysaccharides. Depending upon their location polysaccharides play multiple functions in living world few examples of polysaccharides include Cellulose, chitin, inulin etc.

(1) All the listed polysaccharides are homopolymers except
(a) Starch (b) glycogen (c) Chitin (d) Cellulose

(2) Inulin is a polymer of
(a) glucose (b) fructose (c) glucose and sucrose (d) fructose and galactans

(3) Murein is a heteropolysaccharide like
(a) araban (b) xylan (c) hyaluronic acid (d) agar

(4) A polysaccharide found in the exoskeleton of crabs is
(a) Cellulose (b) pectin (c) murine (d) chitin

(5) The right end of the polysaccharide chain is called
(a) reducing end (b) non-reducing end (c) right end (d) none of these

Lipids form a heterogeneous group but all are made up of carbon hydrogen and oxygen. These are insoluble in water and soluble in organic solvents like acetone, ether, alcohol etc. The number of oxygen atoms is very small compared to carbon atoms. They need a large amount of oxygen for their oxidation to release energy. They could be simple lipids, compound lipids, and derived lipids. Simple lipids are esters of fatty acid and alcohol. Compound lipids are formed when simple lipids combine with another compounds for example glycolipids, phospholipids and lipoproteins. Derived lipids are of various types and important example being steroids.

(1) Lipids mainly consist of
(a) Carbon only
(b) carbon hydrogen and nitrogen
(c) carbon hydrogen and oxygen
(d) Hydrogen only

(2) Among the given options non-polymeric molecule is
(a) Nucleic acids (b) proteins (c) Lipids (d) polysaccharides

(3) An example of unsaturated fatty acid is
(a) oleic acid (b) stearic acid (c) Linoleic acid (d) both a and c

(4) The number of carbon atoms as compared to oxygen atoms in lipids is
(a) same (b) much less (c) much more (d) none of these.

(5) Steroids are an example of
(a) derived lipids (b) conjugated lipids (c) simple lipids (d) lipo proteins

Briefly describe the structure of the Brain.

Describe briefly the four major groups of Protozoa.

What is a centromere? How does the position of centromere form the basis of classification of chromosomes. Support your answer with a diagram showing the position of centromere on different types of chromosomes.