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Biological Classification

Q: A teacher was explaining about a constant physical contact involving almost equal physiological interdependence in two different thalloid forms. He was trying to explain, which one of the following?

The teacher was explaining the advent of lichen formation. A lichen is made up of a simple photosynthesising organism, usually green algae or cyanobacteria, surrounded by filaments of a fungus. Generally, most of lichens bulk is made of interwoven fungal filaments, although in filamentous and gelatinous lichens this is not the case. The fungus is called as a mycobiont. The photosynthesizing organism is called as a photobiont. Algal photobionts are called as phycobionts. Cyanobacteria photobionts are called as cyanobionts. The part of a lichen that is not involved in reproduction, the "body" or vegetative tissue" of a lichen, is called as the thallus. The thallus form is very different from any form, where the fungus or alga are growing separately. The thallus is made up of filaments of the fungus called as hyphae. The filaments grow by branching then rejoining to create a mesh, which is called being. The mesh of fungal filaments may be dense or loose.Thus, the correct answer is option D.

Q: Yeast like budding of Oidia in Mucor / Rhizopus is called as

In some species of Mucor, e.g., M. racemosus, if grown in liquid media with a high concentration of sugar, the hyphae breakup into short segments known as oidia. These oidia further increase by budding in yeast like fashion. This is called as torula condition. Thus, the correct answer is option C.

Q: Short twisted strands of hyphae which serves as anchors for lichens are

The short twisted strands of hyphae which are primarily involved in providing anchorage to the lichens are called as rhizines. Unlike the roots of higher plants, they do not absorb nutrients from the soil but serve only as anchors.So the correct answer is option B.

Q: Parasexuality is involved with

In some fungi, true sexual cycle involving nuclear fusion and meiosis is absent. Instead of that, other form of reproduction is seen i.e., plasmogamy. In this fusion of cytoplasm takes place followed by meiosis (haploidisation only). Thus, the correct option is 'Fusion of cytoplasm.'

Q: Red rot of sugarcane and white rust of radish respectively are caused by

Red rot of sugarcane is a severe disease traced in sugarcane. It is caused by Colletotrichum falcatum. The mycelium of the fungus infects the parenchymatous cells of the host tissue. The pathogen enters through the nodes at the leaf scars, through any kind of wound, through root primordia and seed-cuttings. It produces conidia which grow into mycelium and infects the host.White rust is a disease caused by Albugo candida. Chlorosis on leaf surfaces, white blister-like growths on the underside of leaves and on the stems of the plant, and swelling of the roots are some common symptoms. It enters the host by producing the germ tube which will penetrate and infect the host through a stoma or the sporangia releases zoospores which travel through films of water.So, the correct answer is option E.

Q: Asexual reproduction in fungi takes place by

Asexual reproduction in fungi takes place by the germination of a type of exospore called Conidiospores which are formed on the Conidiophores of the fungi.So the correct answer is Conidiospores.

Q: Branched chain of lipids occur in the cell membranes of

Archaebacteria are the primitive bacteria. The cell membrane of this organism possess glycolipids, glycoproteins and amino acids which are linked through the ether linkage. This network of the branched lipids provide protection to the organism and allows the organism to live in extreme conditions.Thus, the correct answer is option A.

Q: Zygospore is formed from

Correct Answer: AExplanation: Gametangia are the sex organs of fungi. The male and female gametangia are born on two different fungal hyphae. The two gametangia from different sex unite together and form a fertilization tube through which the male gamete migrates into the female gametangium. This process of fusion of gametes in fungi is known as Gametangial copulation.When the two gametes of the opposite sex come together it is known as a gametic union. A zygote is formed by the fusion of male and female gametes.Oogamy is a form of sexual reproduction. It is a form of anisogamy (heterogamy) in which the female gamete (e.g. egg cell) is significantly larger than the male gamete and is non-motile.So, the correct answer is option A.

Q: Which of the following induces sexual reproduction in Mucor/Rhizopus?

Blakslee (1904) discovered the phenomenon of sexual incompatibility in fungi. Since, the two compatible strains could not be distinguished morphologically, he labelled one '+' and the other '-'. Later, Burgeff (1924) demonstrated that a diffusable substance is responsible for the initiation of sexual reproduction and has been chemically identified to be trisporic acid.Thus, the correct answer is option B.

Biology
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NEET Easy Qs Med Qs Hard Qs

A teacher was explaining about a constant physical contact involving almost equal physiological interdependence in two different thalloid forms. He was trying to explain, which one of the following?

Mycorrhizal association

Establishment of heterothallism

Operation of heterothallism

Advent of lichen formation

Hard

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Yeast like budding of Oidia in Mucor / Rhizopus is called as

Palmella

Chantransia

Torula

Gongrosira

Hard

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Short twisted strands of hyphae which serves as anchors for lichens are

Mycelium

Rhizines

Roots

Rhizoids

Hard

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Parasexuality is involved with

Fusion of gamete and protoplast.

Fusion of male gamete with secondary nucleus.

Fusion of cytoplasm.

Fusion of male and female gamete.

Hard

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Assertion

Whittaker's classification for algae was not acceptable.

Reason

Whittaker grouped algae in different kingdoms.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.

Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.

Assertion is correct but Reason is incorrect.

Both Assertion and Reason are incorrect.

Hard

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Red rot of sugarcane and white rust of radish respectively are caused by

Albugo candida and Cercospora

Colletotrichum and Fusarium

Pythium and Phytophthora

Albugo candida and Puccinia graminis

Colletotrichum and Albugo candida

Hard

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Asexual reproduction in fungi takes place by

Endospore

Gametangia

Conidiospore

None of the above

Hard

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Branched chain of lipids occur in the cell membranes of

Archaebacteria

Mycoplasma

Actinomycetes

Streptomyces

Hard

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Zygospore is formed from

Gametangial copulation

Gametic union

Zygote

Oogamy

Hard

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Which of the following induces sexual reproduction in Mucor/Rhizopus?

Indole acetic acid

Trisporic acid

Gibberellic acid

Citric acid

Hard

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Biological Classification

Biology 4793 Views

A teacher was explaining about a constant physical contact involving almost equal physiological interdependence in two different thalloid forms. He was trying to explain, which one of the following?

Yeast like budding of Oidia in Mucor / Rhizopus is called as

Short twisted strands of hyphae which serves as anchors for lichens are

Parasexuality is involved with

Whittaker's classification for algae was not acceptable.

Whittaker grouped algae in different kingdoms.

Red rot of sugarcane and white rust of radish respectively are caused by

Asexual reproduction in fungi takes place by

Branched chain of lipids occur in the cell membranes of

Zygospore is formed from

Which of the following induces sexual reproduction in Mucor/Rhizopus?

Biology
4793 Views