Tag: biology

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Questions Related to biology

Multiple choice biology protectors of biosphere structure of chloroplast plastids photosynthetic pigments

Enzymes required for photophosphorylation are located in ............ of chloroplast.

  1. Peristromium

  2. Plastidome

  3. Stroma

  4. Quantasome
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

A) The peristomium is the first true body segment in an annelid worm's body in the anterior end.

B) Plastid or plastidome refers to the entire unit where photosynthesis takes place.
C) Enzymes that are responsible for photophosphorylation are not present in the stroma.
D) Quantasomes are particles found in the thylakoid membrane of chloroplasts in which photosynthesis takes place. They are embedded in the surface of thylakoid discs in chloroplasts. They are composed of lipids and proteins that include various photosynthetic pigments and redox carriers. For this reason, they are considered to be photosynthetic units. They occur in 2 sizes: the smaller quantasome is thought to represent the site of photosystem I, the larger to represent the site of photosystem II which are involved in photophosphorylation. 
So the correct answer is 'Quantasome'.

Multiple choice biology protectors of biosphere structure of chloroplast plastids photosynthetic pigments

Quantasome is a unit related to

  1. Respiration

  2. Ascent of sap

  3. Growth

  4. Photosynthesis
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

A) Quantasomes are not involved in respiration.
B) Xylem is involved in the ascent of sap. Quantasomes do not play a part in the ascent of sap.

C) Quantasomes are involved in photosynthesis. They do not directly contribute to growth.
D) Quantasomes are particles found on the inner thylakoid membrane of chloroplasts in which photosynthesis takes place.
So the correct answer is 'Photosynthesis'.

Multiple choice biology protectors of biosphere structure of chloroplast plastids photosynthetic pigments

On what basis, paper chromatography separates plant pigments?

  1. The non - polarity of the solvents and pigments

  2. The polarity of the paper

  3. The polarity of the pigments

  4. All of the above

  5. None of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Paper chromatography is a technique that is used in the laboratories to separate plant pigments. The concept used is that this helps to separate the mixture into its component molecules. The molecules migrate, or move up the paper, at different rates because of differences in solubility, molecular mass, and hydrogen bonding with the paper.

Multiple choice biology diversity in living world characteristics of vertebrates classification of vertebrata classifications of chordata

Common name of Petromyzon is

  1. Lancet

  2. Hagfish

  3. Acornworm

  4. Lamprey
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Sea Lamprey or Petromyzon is an agnathan. It is a marine organism. It lacks jaws and resembles an eel. It has a sucker-like mouth that is involved in filter feeding. It has seven brachial openings behind its eyes. They are anadromous and are usually found at depths of around 4000 m and can tolerate temperature ranges from 1.0 and 20 °C.

So, the correct answer is 'Lamprey'.

Multiple choice biology diversity in living world characteristics of vertebrates classification of vertebrata classifications of chordata

Vertebrates without jaws belong to 

  1. Urochordata

  2. Hemichordata

  3. Agnatha

  4. Gnathostomata
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Agnathans are basically primitive jawless fishes. They include lampreys and hagfishes. They usually have soft, cylindrical bodies that lack scales. In some species, separate external gill slits are present, while they open via a single pore in others. They have a suctorial or a filter-feeding mouth and they lack jaws.

So, the correct answer is 'Agnatha'.

Multiple choice biology diversity in living world characteristics of vertebrates classification of vertebrata classifications of chordata

Which one of the following pairs of animals are jaw-less fishes?

  1. Lampreys and hag fishes

  2. Guppies and hag fishes

  3. Lampreys and eels

  4. Mackerels and rohu
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The class Agnatha consists of a group of animals, that lack jaws and paired fins. There are two living groups of Agnatha, the lampreys, and the hagfish. 

So, the correct answer is option A.

Multiple choice biology diversity in living world characteristics of vertebrates classification of vertebrata classifications of chordata

The type of tail seen in Cyclostomata is 

  1. Isocercal.

  2. Homocercal.

  3. Heterocercal.

  4. Protocercal.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Cyclostomata is a group of chordates comprising of living jawless fishes, the lampreys, and hagfishes. Their tail is protocercal in cyclostomes, having a caudal fin extending around the end of the vertebral column. The protocercal tail is formed by the division of tail into two equal lobes supported by fins.

Hence, option D is correct.

Multiple choice biology diversity in living world characteristics of vertebrates classification of vertebrata classifications of chordata

The jawless vertebrate is 

  1. Crocodile

  2. Loris

  3. Hyla

  4. Fox

  5. Petromyzon
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

Out of the given options, only Petromyzon is a jawless vertebrate, that is, it is an agnathan. In physical appearance, it resembles an eel. It has a sucker-like mouth that is involved in filter feeding. The rest of the examples are all gnathostomes or jawed vertebrates. 

So, the correct answer is 'Petromyzon'.

Multiple choice biology diversity in living world characteristics of vertebrates classification of vertebrata classifications of chordata

The larva of cyclostomates is known as 

  1. Lamprey

  2. Amphioxus

  3. Ascridian

  4. Ammocoete
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Cyclostomata is a group of chordates that comprises the living jawless fishes, the lampreys, and hagfishes. They lay numerous eggs, about 1mm in diameter and lodge in the gravel around the nest. The egg hatches into an ammocoete larva, which is a blind, worm-like animal that burrows in the slit.

So, the correct answer is option D.

Multiple choice biology diversity in living world characteristics of vertebrates classification of vertebrata classifications of chordata

Petromyzon cannot be called as fish, as

  1. It lacks median fins

  2. It lacks paired fins

  3. It lacks an operculum

  4. It has acicular mouth
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
Petromyzon is the scientific name of the sea lamprey. It is long and slender snake like organism. This organism is not called as the true fish. The organism lacks the paired fins. The organism have well developed dorsal and ventral finfolds. This finfolds helps in swimming and locomotion. 
Thus, the correct answer is option B.