CBSE Class 12 Biology Reproduction In Organisms Worksheet Set 03

Question: Single-celled animals are said to be immortal because
a) they grow indefinitely in size
b) they can tolerate any degree of change in temperature
c) they can reproduce throughout their lifespan
d) they continue to live as their daughter cells

Answer: d

Question: Which of the following options is/are correct about pollination?
a) Occurs in almost all flowering plants
b) Facilitates pollen transfer to stigma
c) Both (a) and (b)
d) None of the above

Answer: c

Question: Strobilanthes kunthiana is also called
a) Neelakurinji
b) Peela kuranji
c) Hara kuranji
d) Kala kuranji

Answer: a

Question: Cell division is the mode of reproduction in
a) monerans
b) protists
c) Both (a) and (b)
d) None of these

Answer: c

Question: Zoospores are
a) motile gametes of Chlamydomonas
b) non-motile gametes of sponges
c) motile gametes of Hydra
d) non-motile gametes of Penicillium

Answer: a

Question: In diploid organism the gamete producing cells are called
a) gamete mother cell
b) meiocytes
c) Both (a) and (b)
d) None of these

Answer: c

Question: Gemmule formation is a common mode of reproduction in
a) Hydra
b) sponge
c) Penicillium
d) Amoeba

Answer: b

Question: The site of origin of the new plantlets in potato, Dahlia, ginger and banana is
a) floral buds present on stem
b) internodes of modified stem
c) nodes of modified stem
d) adventitious buds present on root

Answer: c

Question: Organisms reproducing throughout the year are called …… breeders, e.g. … and those who show recurring sexual activity are called …… breeders, e.g. … .
a) continuous, sparrow, seasonal, hen
b) seasonal, lizard, continuous, hen
c) continuous, man, seasonal, tiger
d) seasonal, hen, continuous, tiger

Answer: c

Question: Choose the incorrect pair.
a) Cell division in embryo – Increase the number of cells
b) Cell differentiation – Form specialised tissues and organs
c) Eggs covered by hard calcareous shell – Oviparous animals
d) Zygote develops outside the body –Viviparous animals

Answer: d

Question: Sexual reproduction involves formation of male and female gametes by
a) same individual
b) different individual of opposite sex
c) Both (a) and (b)
d) All of the above

Answer: c

Question: Reproduction can be considered as
a) a biological process
b) a cycle of birth, growth and death
c) a process that enables continuity of species
d) All of the above

Answer: d

Question: Offsprings of oviparous animals have less chances of survival as compared to those of viviparous animals because
a) proper embryonic care and protection is absent
b) embryo does not develop completely
c) progenies are of smaller size
d) genetic variations do not occur

Answer: a

Question: Select the correct sequence from the following.
I. Juvenile phase → Senescent phase → Reproductive phase
II. Juvenile phase → Reproductive phase → Senescent phase
III. Reproductive phase → Juvenile phase → Senescent phase
IV. Pre-reproductive phase → Reproductive phase → Senescent phase
a) I and II
b) I and IV
c) III and IV
d) II and IV

Answer: d

Question: Oestrus cycle is cyclic change in the activities of ovaries and accessory duct in non-primates during
a) reproductive (seasonal) period
b) maturation period
c) ageing period
d) juvenile period

Answer: a

Question: Syngamy may occur in ………… .

a) external medium
b) internal medium
c) Both (a) and (b)
d) None of these

Answer: c

Question: What is male gamete called in heterogametic condition?
a) Antherozoid
b) Sperm
c) Egg
d) Both (a) and (b)

Answer: d

Question: Asexual reproduction is a method of reproduction in which participation of ……… takes place.
a) one individual
b) two individuals (same species)
c) multi-individuals
d) two individuals (different species)

Answer: a

Question: The condition, in which, both male and female reproductive organs are found on the same plant, is called
a) unisexual
b) bisexual
c) monoecious
d) Both (b) and (c)

Answer: d

Question: In flowering plants, the unisexual male flower is called …A… while the female is called …B… . Flowering plants may be monoecious, e.g. …C… or dioecious, e.g. …D… . Complete the paragraph by filling up the blanks.
a) A–staminate, B–pistillate, C–date palm, D–coconut
b) A–pistillate, B–staminate, C–date palm, D–papaya
c) A–pistillate, B–staminate, C–Cucurbita, D–coconut
d) A–staminate, B–pistillate, C–Cucurbita, D–papaya

Answer: d

Question: Some organisms are capable of asexual or sexual reproduction. Under favourable conditions, reproduction proceeds asexually. When conditions become more stressful reproduction switches to a sexual mode. Why?
a) Sexual reproduction is simple and more rapid allowing larger numbers of offspring to be produced
b) Sexual reproduction requires two separate individuals, who can mutually provide nutrient support during stress
c) Sexual reproduction produces individuals with new combinations of recombined chromosomes increasing diversity
d) Asexual reproduction requires more energy

Answer: c

Question: If the parent body is haploid then the gametes are
a) haploid
b) diploid
c) triploid
d) None of these

Answer: a

Question: Essential and most critical event in sexual reproduction is
a) fertilisation
b) division in male and female gametes
c) Both (a) and (b)
d) None of the above

Answer: c

Question: Internal fertilisation is the one in which syngamy
a) occur outside the body
b) occur inside the body
c) is followed by meiosis
d) None of the above

Answer: b

Question: Life begins in all sexually reproducing organism from a
a) single-celled zygote
b) double-celled zygote
c) thick-walled zygote
d) All of these

Answer: a

Question: Chances of survival of young ones are more in the case of............. individuals.
a) oviparous
b) viviparous
c) ovoviviparous
d) None of these

Answer: b

Question: The male gametes of rice plant have 12 chromosomes in their nucleus. The chromosome number in the female gamete, zygote and the cells of the seedling will be, respectively
a) 12, 24, 12
b) 24, 12, 12
c) 12, 24, 24
d) 24, 12, 24

Answer: c

Question: Diploid zygote is universal in
a) All sexually reproducing organisms
b) All asexually reproducing organisms
c) All sexually and asexually reproducing organisms
d) Only plants and animals

Answer: a

Question: Amoeba and yeast reproduce asexually by fission and budding, respectively because they are
a) microscopic organisms
b) heterotrophic organisms
c) unicellular organisms
d) uninucleate organisms

Answer: c