Tag: biology

Quizzes (1160) Questions (12174)

Questions Related to biology

Multiple choice biology mendel's law of inheritance mendel's laws laws of inheritance mendel's laws of inheritance

Choose the correct answer from the alternatives given.
Mendels law of independent assortment does not hold true for the genes that are located closely on ______________________.

  1. Same chrormosome

  2. Non-homologous chromosomes

  3. X-chromosome

  4. Autosomes
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

As per linkage experiments carried out by Morgan, the two linked genes do not always segregate independently of each other and $F _2$ ratio deviated very significantly from 9:3:3:1 ratio (expected when two genes are independent). Hence, if linkage was known at the time of Mendel, he would riot have been able to explain law of independent assortment. 

Multiple choice biology mendel's law of inheritance mendel's laws laws of inheritance mendel's laws of inheritance

Choose the correct answers from the alternatives given.
The mechanisms of .................have been referred to as life's defenses against disorder.

  1. respiration

  2. homeostasis

  3. adaptation

  4. metabolism
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Homeostasis is any self-regulating process by which an organism trying to maintain stability while adjusting to conditions that are best for its survival. If homeostasis is successful, life continues, if it's unsuccessful, it results in a disaster or death of the organism.

So the correct answer is B, homeostasis.

Multiple choice biology mendel's law of inheritance mendel's laws laws of inheritance mendel's laws of inheritance

According to the concept of dominance, the modified allele is equivalent to the unmodified allele when?

  1. It produces normal/less efficient enzyme

  2. It produces the same phenotype/trait

  3. It results in the transformation of substrate

  4. More than one option is correct
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
A gene is responsible for the appearance of a specific trait. In diploid organisms, a gene is represented by a pair of alleles. When these two alleles are not identical, one of alleles is different with modified information. Normal allele will form normal enzyme. Changed or modified allele can form three types of enzymes i.e. normal enzyme, non-functional enzyme, no enzyme at all. Enzyme is always required for the formation of substrate say ‘S’. Modified allele is almost similar to normal allele and forms the same enzyme and produces same phenotypic trait i.e., leads to the formation of substrate ‘S’. But sometimes allele formed are non­functional enzyme or no enzyme and phenotypic trait depends on functioning of un-modified allele. Functioning or unmodified allele will form the original normal phenotypic trait (due to dominant allele) and modified allele will be known as recessive allele.
So the correct option is 'it produces normal/less efficient enzyme'.
Multiple choice biology diversity in living world characteristics of annelida and arthropoda characteristics of platyhelminthes and aschelminthes basis of classification in animals

How many features listed are exhibited by flatworms(A) and bacteria(B)?
(i) Growth by increases in mass only
(ii) Regeneration
(iii) Self-consciousness
(iv) Anabolism and catabolism
(v) Binary fission.

  1. A-(i, ii, iii, iv), B-(i, iii, iv)

  2. A-(ii, iv), B-(iv, v)

  3. A-(ii, iii, iv), B-(i, iv, v)

  4. A-(i, ii), B-(iii, iv, v)
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Flatworms (A) exhibit growth, regeneration, and metabolism (anabolism/catabolism). Bacteria (B) exhibit growth, metabolism, and binary fission. Neither exhibits self-consciousness.

Multiple choice biology diversity in living world characteristics of annelida and arthropoda characteristics of platyhelminthes and aschelminthes basis of classification in animals

Body cavity of animals derived from Blastocoel is known as

  1. Pseudocoelom

  2. Schizocoelom

  3. Enterocoelom

  4. Haemocoel
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Schizocoelom develops as a split in the mesoderm, e.g.-Arthropods, Annelids, and Molluscs. Enterocoelom is derived from the wall of embryonic gut, e.g.-Echinoderms, and Chordates. Haemocoel is the blood-filled cavity of arthropods. Pseudocoelom is also known as a false cavity.

Multiple choice biology diversity in living world characteristics of annelida and arthropoda characteristics of platyhelminthes and aschelminthes basis of classification in animals

Which of the following nematodes are parasitic to humans? 

  1. Ascaris

  2. Earthworm

  3. Both A and B

  4. Housefly
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Ascariasis is a disease caused by the parasitic roundworm Ascaris lumbricoides. These are long, slender, tapered at both the ends. The body is covered with a thick cuticle secreted by a cellular or syncytial epidermis. The life cycle of Ascaris involves only one host. The man is a definitive host for worm and is present in the gastrointestinal tract and fecal matter. Hence, option A is the correct answer. 

Multiple choice biology diversity in living world characteristics of annelida and arthropoda characteristics of platyhelminthes and aschelminthes basis of classification in animals

_________ is a parasite which also causes waterborne disease.

  1. Roundworm

  2. Tapeworm

  3. Both A and B

  4. Earthworm
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Important class of waterborne diseases are caused by metazoan parasites. Typical examples include certain Nematode, that is to say "roundworms". As an example of waterborne Nematode infections, one important waterborne nematodal disease is Dracunculiasis. It is acquired by swallowing water. Therefore, the correct answer is option A.

Multiple choice biology diversity in living world characteristics of annelida and arthropoda characteristics of platyhelminthes and aschelminthes basis of classification in animals

The eggs of which parasite are bile stained

  1. Ascaris lumbricoides

  2. Ancylostoma duodenale

  3. Enterobius vermicularis

  4. Necator Americans
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
the fertilized eggs of parasite Ascaris lumbricoides is rounded and has a mineral layer that is often stained by bile as they pass through the excreta
So, the correct answer is 'Ascaris lumbricoides'
Multiple choice biology diversity in living world characteristics of annelida and arthropoda characteristics of platyhelminthes and aschelminthes basis of classification in animals

Animal of which phylum have hooks and suckers and are endoparasite on other animals?

  1. Platyhelminthes

  2. Annelida

  3. Ascheminthes

  4. Arthropoda
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Platyhelminthes or flatworms are dorsoventrally flattened and bilaterally symmetrical worms. They are endoparasites and have parasitic adaptations like hooks and suckers.

So the correct option is A.