Tag: biology

Questions Related to biology

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 ______________________.

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

  1. Same chrormosome

  2. Non-homologous chromosomes

  3. X-chromosome

  4. Autosomes

Show answer
Correct Option: A
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. 

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

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

  1. respiration

  2. homeostasis

  3. adaptation

  4. metabolism

Show answer
Correct Option: B
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.

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

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

  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

Show answer
Correct Option: A
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'.

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.

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

  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)

Show answer
Correct Option: A

Body cavity of animals derived from Blastocoel is known as

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

  1. Pseudocoelom

  2. Schizocoelom

  3. Enterocoelom

  4. Haemocoel

Show answer
Correct Option: A
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.

Which of the following nematodes are parasitic to humans? 

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

  1. Ascaris

  2. Earthworm

  3. Both A and B

  4. Housefly

Show answer
Correct Option: A
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. 

_________ is a parasite which also causes waterborne disease.

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

  1. Roundworm

  2. Tapeworm

  3. Both A and B

  4. Earthworm

Show answer
Correct Option: A
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.

The eggs of which parasite are bile stained

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

  1. Ascaris lumbricoides

  2. Ancylostoma duodenale

  3. Enterobius vermicularis

  4. Necator Americans

Show answer
Correct Option: A
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'

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

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

  1. Platyhelminthes

  2. Annelida

  3. Ascheminthes

  4. Arthropoda

Show answer
Correct Option: A
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.

Roundworms reproduce through

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

  1. Sexual reproduction

  2. Vegetative propagation

  3. Do not reproduce

  4. None of the above

Show answer
Correct Option: A