FREE NEET Biology Practice MCQ Test: Reproduction In Organisms Exercise 4 Questions Answers With Detailed Explanations [PDF]

Answer: (b)

Both Assertion and Reason are true and Reason is the correct explanation of Assertion. In flowering plants, the zygote is formed inside the ovule and after fertilisation, the zygote develops into embryo and the ovules into seeds.

Answer: (b)

Homothallic and monoecious are used to denote bisexual condition. The example includes fungi and plants. Heterothallic and dioecious are used to denote unisexual condition.

Answer: (d)

Answer: (b)

The rhizome is a thickened, underground, dorsiventral stem that grows horizontally at a particular depth within the soil. It is brown in colour and shows cymose branching. It can be distinguished from the modified root by the presence of nodes, internodes, terminal buds, axillary buds and scale leaves. The rhizome are perennial and propagate vegetatively. They store food materials and appear tuberous. E.g., Zingiber officinale (ginger), Curcuma longa (turmeric), Canna indica, etc.

Answer: (b)

The end of vegetative phase in plants which marks the beginning of the reproductive phase can be easily seen in the higher plants when they come to flower.

Answer: (b)

Answer: (a)

Sargassum is a brown alga. In brown algae, asexual reproduction occurs by means of spores and sexual reproduction varies from isogamy, anisogamy to oogamy.

Answer: (a)

Answer: (b)

Cells become variable in shape, size & getting their specialization for the formation of particular tissue or organ in future foetus. They place themselves at some specific regions in embryo for further organogeny.

Answer: (a)

Statements I and III are correct regarding external fertilisation. Statements II and IV are incorrect and can be corrected as

• A large number of gametes are released into the medium (water) to increase the chances of fertilisation.
• The chances of survival of offspring from external fertilisation are lesser than those of internal fertilisation as they face more risk from predators.

Answer: (c)

Offset is a vegetative part of a plant formed by mitosis. Meiotic division occurs in reproductive organs during formation of gametes. Parthenogenesis is the formation of embryo from ovum or egg without fertilisation. Parthenocarpy is the fruit formed without fertilisation.

Answer: (d)

There is a large diversity in the biological world and to multiply and produce offspring, each organisms has evolved its own mechanism. The type of reproduction is adopted by an organisms that depends on the organism's habitat, its internal physiology and several other factors.

Answer: (d)

Answer: (d)

Vegetative reproduction and apomixis, both are asexual methods of reproduction, which gives the progeny genetically similar to parent.

Answer: (d)

Coelom is a fluid filled space between body wall and alimentary canal which is lined by mesoderm on both sides. Coelenteron is the sac like body cavity in coelenterates. Blastocoel is the fluid filled cavity of blastocyst. Archenteron is the gut cavity in the gastrula en-closed by the endoderm. The open end of it is called blastopore.

Answer: (c)

Answer: (d)

Answer: (a)

Answer: (b)

Onion - Bulb (Underground stem), Ginger - Rhizome, Chlamydomonas - Zoospore, Yeast - Ascospores

Answer: (b)