FREE NEET Biology Practice MCQ Test: Reproduction In Organisms Exercise 1 Questions Answers With Detailed Explanations [PDF]

Answer: (c)

Answer: (a)

Sexual reproduction is mostly biparental. It involves meiosis, gamete formation and usually fertilization also, and introduces genetic variation in the offsprings and play a role in evolution of species.

Answer: (a)

Monoecious plants have separate male and female flowers on the same plant. Pinus have both the male and female cones or strobili on the same tree.

Answer: (d)

Fungi reproduce by vegetative, asexual and sexual means. About 20% fungi propagate only by asexual means. Asexual reproduction takes place during favourable conditions by the formation of a variety of conidia or spores. The spores may be unicellular (e.g., Aspergillus) or multicellular (e.g., Alternaria). Bacteria also reproduce mainly by asexual method and therefore they have a dominant haploid phase in their life cycle. Asexual reproduction in bacteria takes place by binary fission, budding, conidia, cysts and endospores.

Answer: (a)

Death is a natural process by which the individuals die either naturally or due to illness, accident, etc. But, before dying generally, individuals leave new individuals of their own kind through reproduction and thus the life continues.

Answer: (d)

Answer: (b)

Metamorphosis is a process of series of changes of form from larva to adult after embryonic development. Regeneration is defined as replacement, repair or restoration of the lost or damaged structures or reconstitution of the whole body from a small fragment of it during the post-embryonic life of an organism. Growth is the result of greater anabolic (synthetic) processes over the catabolic (destructive) processes in the organism. Ageing may be defined as the progressive deterioration in the structure and functions of the cells, tissues and organs of an organism with the advancing age.

Answer: (a)

Cleavage involves repeated cell division without increase in size. But cell size decreases.

Answer: (a)

Answer: (b)

Answer: (d)

Answer: (c)

Answer: (c)

Answer: (d)

Answer: (a)

The organisms with the increasing order of their lifespans are crow (15 years) < crocodile (60 years) < parrot (140 years).

Answer: (c)

Answer: (a)

In oomycetes female gamete is large and non motile while male gamete is small & motile.

Answer: (a)

The appearance of vegetative propagules from the nodes of plants like sugarcane and ginger is due to the presence of meristematic cells at the nodes. These cells have the capacity of rapid cell division, thus are responsible for growth and development of tissues and organs in plants.

Answer: (a)

External fertilisation occurs outside the body of the organism. It takes place in most aquatic organisms, such as a majority of algae and fish es as well as amphibians. In order to enhance the chances of syngamy, organisms exhibit external fertilisation and release a large number of gametes in the surrounding medium (e.g., water). A major disadvantage is that the offsprings are extremely vulnerable to predators threating their survival upto adulthood.

Answer: (a)

All the given statements are related to water hyacinth. Water hyacinth is a free-floating tropical American water plant which has been introduced as an ornamental and in some warmer regions has become a serious weed of waterways.