Tag: botany

Questions Related to botany

Which of the following plant hormones is incorrectly paired with its function?

botany modes of reproduction why do plants reproduce? reproduction and variation the life cycle of plants

  1. Auxinpromotes stem growth through cell elongation

  2. Cytokinin initiates senescence

  3. Gibberellinstimulates seed and bud germination

  4. Abscisic acidpromotes seed and bud dormancy

Show answer
Correct Option: B
Explanation:

Natural cytokinins are synthesized in regions where rapid cell division occurs, for example, root apices, developing shoot buds, young fruits etc. They promote nutrient mobilization which helps in the delay of leaf senescence.

So, the correct option is 'Cytokinin initiates senescence'


Which one the following is a requirement for sexual reproduction?

botany modes of reproduction why do plants reproduce? reproduction and variation the life cycle of plants

  1. Male and female parents

  2. Production of gametes

  3. Optimal environmental conditions

  4. Aquatic habitat

Show answer
Correct Option: B
Explanation:

Sexual reproduction is the production of new living organisms by combining genetic information from two individuals of different types (sexes). In most higher organisms, one sex (male) produces a small motile gamete which travels to fuse with a larger stationary gamete produced by the other (female). Nearly all animals employ a diploid-dominant life-cycle strategy in which the only haploid cells produced by the organism are the gametes. Early in the development of the embryo, specialized diploid cells, called germ cells, are produced within the gonads (such as the testes and ovaries)

So, the correct answer is 'production of gametes'

Reproduction may be defined as a phenomenon by which organisms

botany modes of reproduction why do plants reproduce? reproduction and variation the life cycle of plants

  1. Increase in size

  2. Produce progeny of their own kind

  3. Are produced from single fertilized eggs

  4. Form new tissues and organs

Show answer
Correct Option: B
Explanation:

Reproduction  is the biological process by which new individual organisms – offspring – are produced from their parents. Reproduction is a fundamental feature of all known life; each individual organism exists as the result of reproduction. Reproduction in human beings is by sexual reproduction where both the male and female gametes fertilize to give rise to an embryo. The fertilization of human embryo occurs inside the body of the female 

So, the correct answer is 'produce progeny of their own kind'

Reproduction, unlike other life processes, is not essential to maintain the life of an individual organism.

botany modes of reproduction why do plants reproduce? reproduction and variation the life cycle of plants

  1. True

  2. False

Show answer
Correct Option: A
Explanation:

  • Reproduction is the biological process by which new individual organisms or 'offsprings' are produced from their 'parents'. Reproduction is a fundamental feature of all known life; each individual organism exists as a result of reproduction. 
  • Though it is not essential, meaning, if someone does not reproduce, it will not end his life.

Therefore, the correct answer is option A.

Reproduction is not essential for an individual but to maintain the species.

botany modes of reproduction why do plants reproduce? reproduction and variation the life cycle of plants

  1. True

  2. False

Show answer
Correct Option: A
Explanation:

  • Reproduction is the process that ensures continuity of species. All Individuals of any species die after their lifespan but some of them leave behind offsprings that will ensure continuity of species.
  • Sterile members of any species, worker bees, mule etc. Complete their lifespan without reproduction. Hence, reproduction is not essential for any individual. 

So, the correct option is 'True'.

State the following statements are true or false.
Presence or absence of hymen is not a reliable indicator of virginity or sexual experience.

botany modes of reproduction why do plants reproduce? reproduction and variation the life cycle of plants

  1. True

  2. False

Show answer
Correct Option: A
Explanation:

The hymen is often torn during the first coitus. the presence or absence of the hymen is not a reliable indicator of virginity or sexual experience.

So, the correct option is 'True'.

Match Column I with Column II and select the correct option using the codes given below.

Column I Column II
A. Mons pubis 1. Embryo formation
B. Antrum 2. Sperm
C. Trophoectoderm 3. Female external genitalia
D. Nebenkern 4. Graafian follicle
botany modes of reproduction why do plants reproduce? reproduction and variation the life cycle of plants

  1. A - 3, B - 4, C - 2, D - 1

  2. A - 3, B - 4, C - 1, D - 2

  3. A - 3, B - 1, C - 4, D - 2

  4. A - 1, B - 4, C - 3, D - 2

Show answer
Correct Option: B
Explanation:

The mons pubis is the rounded eminence, made by fatty tissue beneath the skin, lying in front of the pubic symphysis. The antrum is the portion of an ovarian follicle filled with follicular fluid. The trophectoderm is a layer of cells on the outer edge of a blastocyst. These cells provide nutrients for the developing embryo, facilitate attachment to the uterine lining and become part of the placenta. The nebenkern is a mitochondrial formation in the sperm of some insects such as Drosophila.

 So the correct option is ' A - 3, B - 4, C - 1, D - 2 '.

The process of development of organism like itself is called-

botany modes of reproduction why do plants reproduce? reproduction and variation the life cycle of plants

  1. Budding

  2. Flowering

  3. Reproduction

  4. None of the above.

Show answer
Correct Option: C

Only variations that confer an advantage to an individual organism will survive in a population. 

botany modes of reproduction why do plants reproduce? reproduction and variation the life cycle of plants

  1. True

  2. False

Show answer
Correct Option: A
Explanation:
All the variations do not have an equal chance of surviving in the environment in which they find themselves. The chances of surviving depend on the nature of variations. Different individual would have different kind of advantages. A bacteria that can withstand heat will survive better in a heat wave. Selection of variants by environmental factors forms the basis for revolutionary process.

Reproductive whorls of a flower are :

botany modes of reproduction why do plants reproduce? reproduction and variation the life cycle of plants

  1. Stamens and carpels

  2. Sepals and petals

  3. Sepals and stamens

  4. Petals and carpels

Show answer
Correct Option: A