List of practice Questions

Identify the structure found in the early embryonic stages of amniotes that provides a clue to their aquatic ancestry.

In microtubules, the peripheral doublets are interconnected by linkers called

Identify the correct statement in relation to Paramecium

Mild tertian malaria is caused by

Assertion (A): Life cycle of ectoparasites is more complex with many developmental stages.
Reason (R): Developmental stages of endoparasites have better chances to reach definitive host.

Among the following, nocturnal periodicity is exhibited by

Assertion (A): Mary Mallon was nicknamed as 'Typhoid Mary'.
Reason (R): Mary Mallon spread typhoid for several years through the food she prepared.

Hyaline cartilage occurs in

• A. Sternal part of the ribs.
• B. Pubic Symphysis.
• C. Epiphyseal plate.
• D. Vocal chords.
• E. Epiglottis.
• F. Endoskeleton of cyclostomes.

Choose the incorrect statements regarding Hirudinea

• A. Male reproductive system has cirrus.
• B. They are exclusively marine and tubicolous.
• C. Fertilization is external and development is direct.
• D. Clitellum is conspicuous during the breeding season only.

The spermathecae in earthworm are present in

Choose the correct combination among the following

• A. Bivalvia - Radula - Rasping organ
• B. Scaphopoda - Captacula - Capture of food
• C. Pelecypoda - Crystalline style - Digestion of starch
• D. Cephalopoda - Osphradium - Water purity testing

The gene that is believed to play a key role in human language expression is

Assertion (A): Pneumaticity of bones is the unique feature of reptiles.
Reason (R): Air sacs associated with lungs of birds facilitate continuous oxygenation of blood.

Conversion of milk into curd by lactic acid bacteria increases

Assertion (A): Methanogens are present in the rumen of cattle.
Reason (R): They help in the breakdown of cellulose and nutrition of cattle.

Rats belong to the class

Choose the incorrect pair among the following

• A. Biosphere reserve - Indo Burma region
• B. Aravalli Hills - Rajasthan and Gujarat
• C. Koringa sanctuary - Uttarakhand
• D. Biodiversity hotspot - Himalayan region

Assertion (A): Kidneys of vertebrates are called retroperitoneal organs.
Reason (R): They are covered by parietal peritoneum only on their ventral side.

Assertion (A): Mast cells secrete serotonin.
Reason (R): Vasodilators cause inflammation in response to infection.

Among the following, the wrong statement related to Bt cotton

The number of phenotypes and their genotypic ratio found when heterozygous round and yellow seeded pea plant crossed with other pea plant showing seeds with wrinkled and heterozygous yellow

The ratio of homozygous tall and dwarf plants in F2 generation in monohybrid cross is

Assertion (A): Cistron is a segment of DNA coding for a polypeptide.
Reason (R): Monocistronic structural genes are not splitted in Eukaryotes.