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ICAR JRF Plant Reproduction — practice questions — page 2

Explore 62 free Plant Reproduction questions in ICAR JRF Plant Sciences. Open each question or exercise to read its content, reference answers and available explanation.

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Plant Reproduction questions and exercises with answers

Showing questions 31–60 of 62.

Self-incompatibility in flowering plants is controlled by which locus?Read the answer and worked solution →Bee-pollinated flowers rarely appear red. Why?Read the answer and worked solution →Flowers pollinated by flies typically show which combination?Read the answer and worked solution →Moth-pollinated flowers tend to have which form?Read the answer and worked solution →Which set of features marks a bird-pollinated flower?Read the answer and worked solution →Which feature is absent from wind-pollinated flowers?Read the answer and worked solution →In double fertilisation, what do the two sperm cells produce?Read the answer and worked solution →What is the function of the suspensor in a developing embryo?Read the answer and worked solution →A typical seed contains which set of structures?Read the answer and worked solution →The scutellum of a monocot seed is best described as which kind of organ?Read the answer and worked solution →Which layer secretes the enzymes that mobilise stored reserves when a cereal grain germinates?Read the answer and worked solution →In a non-endospermic dicot such as the pea, where do the food reserves end up?Read the answer and worked solution →In a dicot seed, the seed coat divides into which two layers?Read the answer and worked solution →Which part of the embryonic axis gives rise to the root?Read the answer and worked solution →What is the purpose of the hook shape formed by the epicotyl of a germinating dicot seed?Read the answer and worked solution →In a germinating monocot seed, what does the coleoptile cover?Read the answer and worked solution →Why does a germinating monocot end up with a fibrous root system?Read the answer and worked solution →Which treatment softens a thick seed coat to allow germination?Read the answer and worked solution →Which fruit type develops from an inflorescence, that is a cluster of flowers?Read the answer and worked solution →The exocarp, mesocarp and endocarp of a fruit are together known as what?Read the answer and worked solution →Seed dormancy lets a plant disperse its progeny in a way animals cannot. In what way?Read the answer and worked solution →The production of seeds without fertilisation is known as what?Read the answer and worked solution →Which is given as an advantage of asexual reproduction in plants?Read the answer and worked solution →In grafting, what are the scion and the stock?Read the answer and worked solution →Which propagation method bends a stem that is still attached to the parent and covers it with soil?Read the answer and worked solution →In plant tissue culture, the undifferentiated mass from which plantlets later grow is called what?Read the answer and worked solution →A carrot, which completes its life cycle in two seasons, is which kind of plant?Read the answer and worked solution →Bamboo and yucca flower only once in their lifetime. Such plants are called what?Read the answer and worked solution →How long may the vegetative period last in some bamboo species before flowering?Read the answer and worked solution →Which characteristic of senescence explains the yellowing of leaves?Read the answer and worked solution →

Worked practice questions

Self-incompatibility in flowering plants is controlled by which locus?

  1. The P locus
  2. The R locus
  3. The S locus
  4. The T locus
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Correct answer: C. The S locus

1. Incompatibility genes prevent pollen from germinating or growing into the stigma of a flower. 2. Self-incompatibility is controlled by the S locus, where S stands for sterility. 3. In some plants, such as cabbage, pollen is rejected at the stigma surface and never germinates. 4. In others the pollen tube is arrested after growing a third of the way down the style, and then dies. 5. That death follows either programmed cell death or degradation of pollen tube RNA by a ribonuclease encoded by the same locus. 6. This mechanism matters commercially because it inhibits the production of inbred and hybrid plants. _Source: OpenStax Biology (1st ed., CC BY 4.0), Ch 32 "Plant Reproduction", section 32.2 Pollination and Fertilization_

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Bee-pollinated flowers rarely appear red. Why?

  1. Bees cannot see the colour red
  2. Bees avoid red because it signals poison
  3. Red pigment blocks the nectar guides
  4. Red flowers open only at night time
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Correct answer: A. Bees cannot see the colour red

1. Bees are perhaps the most important pollinator of many garden plants and most commercial fruit trees. 2. Bees cannot see the colour red. 3. So bee-pollinated flowers usually carry shades of blue, yellow or other colours instead. 4. Such flowers are also open during the day, strongly scented and often tubular, with a nectar guide. 5. A nectar guide is a pattern on the petals visible only to bees, not to humans, that steers them to the centre of the flower. _Source: OpenStax Biology (1st ed., CC BY 4.0), Ch 32 "Plant Reproduction", section 32.2 Pollination and Fertilization_

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Flowers pollinated by flies typically show which combination?

  1. Bright colours and a sweet fruity scent
  2. Dull colours and a sweet fruity scent
  3. Bright colours and a smell of rotting flesh
  4. Dull colours and a smell of rotting flesh
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Correct answer: D. Dull colours and a smell of rotting flesh

1. Many flies are attracted to flowers with a decaying smell or an odour of rotting flesh. 2. Those flowers usually have dull colours such as brown or purple. 3. So the combination is dull colouring with a carrion odour. 4. They still produce nectar, which supplies energy, while the pollen supplies protein. 5. Bright colouring with a sweet scent is the bee and butterfly pattern, which is the contrast being tested. _Source: OpenStax Biology (1st ed., CC BY 4.0), Ch 32 "Plant Reproduction", section 32.2 Pollination and Fertilization_

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More Plant Sciences topics

Plant Form and PhysiologySoil and Plant Nutrition