FREE NEET Biology Practice MCQ Test: Reproduction In Organisms Exercise 3 Questions Answers With Detailed Explanations [PDF]

Answer: (a)

Anther, a male reproductive organ, is diploid (2n) in chromosome numbers. As a result of microsporogenesis, tetrads of microspores are formed from a single spore mother cell. They are known as pollen grains after their release from tetrads. Pollen grain is the haploid (n) small, male gametophyte covered by two membranes outer ‘exine’ and inner ‘intine’ and divide mitotically to produce a bigger vegetative cell(n) and a smaller generative cell(n). Therefore, if we culture the whole anther then we will get both haploid plantlets from pollen grains and diploid plantlets from anther wall (vegetative cell).

Answer: (d)

Earthworm, sponges, tapeworms are bisexual animals and hermaphrodites as they possess both male and female reproductive organs.

Answer: (b)

Answer: (c)

Statement in option (c) is correct. Rest of the statements are incorrect and can be corrected as

• All the individuals of a species have different lifespan.
• Smaller organisms do not always have a shorter lifespan and vice-versa.
• Some organisms may have a lifespan of several hundred years.

Answer: (a)

Answer: (c)

Male sex organ is called antheridium or globule while female sex organ is called oogonium. They develop on the same branchlet in the same plant in Chara.

Answer: (c)

Two Haploid cell form one diploid cell by sexual reproduction. In higher organism diploid is the most common nature of cell.

Answer: (d)

Statements I and III are incorrect and can be corrected as

• The vegetative phase is of different durartion in different organisms.
• Bambusa differs from Strobilanthes kunthiana in the length of juvenile phase, but both plants are monocarpic. Rest of the statements are correct.

Answer: (c)

Answer: (d)

Answer: (c)

Most of banana varieties are triploid and triploidy is associated with seedlessness.

Answer: (d)

Answer: (d)

Answer: (d)

Hermaphrodite/bisexual/monoecious/homothallic are terms used when both the male and female reproductive organs are present in same organism. Hermaphrodite is used for animals. Bisexual and monoecious are used for both animal and plant. Homothallic is used for fungi.

Answer: (b)

Answer: (c)

Answer: (c)

Sexual reproduction brings about variation through genetic recombinations due to the participation of two parents. In this, the random union of gametes contributes in forming new combinations of characters.

Answer: (c)

Statements I and IV are correct. But statements II and III are incorrect and can be corrected as

• Asexual reproduction is faster than sexual reproduction.
• Asexual reproduction produces progeny that are genetically identical with one another as well as with the parent.

Answer: (b)

Viviparous animals give birth to young ones. This includes all placental mammals. The zygote develops into a young one inside the body of the female. After attaining a certain stage of growth, the young ones are delivered out of the body of the female organism.

Answer: (c)

In Pistia (water lettuce), vegetative propagation occurs by offset where one internode long runners grows horizontally along the soil surface and gives rise to new plants either from axillary or terminal buds.