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Justify the statement Euglena is a taxonomic puzzle.
Euglena is a taxonomic puzzle since, it shows both plant and animal characters. Absence of cell wall is an animal feature and presence of chloroplast is a plant character of Euglena. It have mixotrophic nutrition. In the presence of sunlight, it can photosynthesise its food and in the absence of sunRead more
Euglena is a taxonomic puzzle since, it shows both plant
See lessand animal characters. Absence of cell wall is an animal
feature and presence of chloroplast is a plant character of
Euglena. It have mixotrophic nutrition. In the presence of
sunlight, it can photosynthesise its food and in the
absence of sunlight, it behaves like a heterotroph by
predating on other smaller organisms.
When did cyanobacteria evolved? Why are they referred as the earliest colonisers of barren areas?
Cyanobacteria evolved more than three million years back. They are the self-contained photosynthetic organisms. They can. therefore. live under any type of environment and on any of substrate. Because of this, they are one of the earliest colonisers of barren areas.
Cyanobacteria evolved more than three million years
See lessback. They are the self-contained photosynthetic
organisms. They can. therefore. live under any type of
environment and on any of substrate. Because of this,
they are one of the earliest colonisers of barren areas.
Give the name of the hosts of malarial parasite Plasmodium.
Malarial parasite Plasmodium has following two hosts (i) Female Anopheles mosquito It is a primary host of malarial parasite. The sexual phase of parasite occurs in mosquito. (ii) Human beings These are intermediate or secondary host of Plasmodium. The asexual phase of parasite occurs in humans.
Malarial parasite Plasmodium has following two hosts
See less(i) Female Anopheles mosquito It is a primary host of
malarial parasite. The sexual phase of parasite occurs
in mosquito.
(ii) Human beings These are intermediate or secondary
host of Plasmodium. The asexual phase of parasite
occurs in humans.
What observable features in Trypanosoma would make you classify it under kingdom-Protista?
Observable features in Trypanosoma are (i) Unicellular, flagellum with basal granules. (ii) Well-developed nucleus like eukaryotes. (iii) Reproduces asexually (iv) Reserved food material is in the form of granules.
Observable features in Trypanosoma are
See less(i) Unicellular, flagellum with basal granules.
(ii) Well-developed nucleus like eukaryotes.
(iii) Reproduces asexually
(iv) Reserved food material is in the form of granules.
Why slime moulds are called fungus animals? Name some slime moulds.
Slime moulds possess the characters of both animals and fungi. Therefore, they are commonly called fungus animals. Modern biologists called them protistan fungi. They are like Protozoa in their amoeboid plasmodial stage and similar to true fungi in spore formation. Examples Physarum, Physarella, FulRead more
Slime moulds possess the characters of both animals and
See lessfungi. Therefore, they are commonly called fungus
animals. Modern biologists called them protistan fungi.
They are like Protozoa in their amoeboid plasmodial
stage and similar to true fungi in spore formation.
Examples Physarum, Physarella, Fuligo, Lycogala and
Tubifera.
What are acellular slime moulds?
Acellular slime moulds are consumer-decomposer protists which have a diploid somatic phase represented by Plasmodium, cellulose covered spores for dispersal and haploid swarm cells or myxoamoebae for sexual reproduction.
Acellular slime moulds are consumer-decomposer
See lessprotists which have a diploid somatic phase represented
by Plasmodium, cellulose covered spores for dispersal
and haploid swarm cells or myxoamoebae for sexual
reproduction.
Suppose you accidently find an old preserved permanent slide without a lable. In your effort to identify it, you place the slide under microscope and observe the following features.
Dinoflagellate, kingdom—Protista.
Dinoflagellate, kingdom—Protista.
See lessList two important features of Gonyaulax.
Gonyaulax are important because (i) They have red coloured pigments present in their cells make the sea glow red. They are called red tides. (ii) They produce toxins such as saxitoxin that kills the fish.
Gonyaulax are important because
See less(i) They have red coloured pigments present in their cells
make the sea glow red. They are called red tides.
(ii) They produce toxins such as saxitoxin that kills the
fish.
Which of the organisms are called jewels of the plant world? Elaborate about them.
Diatoms are called the jewels of the plant kingdom because of cell wall ornamentation and presence of golden brown chromatophores. There are two types of diatoms, i.e., the pennate diatont and centric diatom. Pennate diatoms are like small rectangular soap boxes. Centric diatoms are circular.
Diatoms are called the jewels of the plant kingdom
See lessbecause of cell wall ornamentation and presence of
golden brown chromatophores.
There are two types of diatoms, i.e., the pennate diatont
and centric diatom. Pennate diatoms are like small
rectangular soap boxes. Centric diatoms are circular.
Diatoms are called as pearls of ocean. Why? What is diatomaceous earth?
Pearl of ocean Diatoms have a shinning silicified two valved covering or frustule. Because of their distinctive cell walls these are sometimes called the pearls of ocean Diatomaceous earth It is a pile of siliceous skeletons of diatoms which accumulates at the bottom of sea or oceans, being resistanRead more
Pearl of ocean Diatoms have a shinning silicified two
See lessvalved covering or frustule. Because of their distinctive
cell walls these are sometimes called the pearls of ocean
Diatomaceous earth It is a pile of siliceous skeletons
of diatoms which accumulates at the bottom of sea or
oceans, being resistant to decay.