Tag: seeds - structure and germination

Questions Related to seeds - structure and germination

Fruit of peanut is

biology seeds - structure and germination germination seed germination the flower

  1. Pod

  2. Achene

  3. Caryopsis

  4. Drupe

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Correct Option: A
Explanation:

A. Pods develop underground, an unusual feature known as geocarpy. After fertilization, a short stalk at the base of the ovary (termed a pedicel) elongates to form a thread-like structure known as a "peg". This peg grows down into the soil, and the tip, which contains the ovary, develops into a mature peanut pod.

B. Achene- A small, indehiscent, one seeded fruit developing from a monocarpellary ovary and in which pericarp is hard, leathary and remains free from seed coat. E.g. Mirabilis.

C. Caryopsis- A small, indehiscent, one seeded fruit developing from a monocarpellary ovary and in which pericarp is fused with the seed coat. E.g. Wheat.

D. Drupe- A small, indehiscent, one seeded fruit developing from a monocarpellary ovary and in which pericarp is differentiated into outer,thin epicarp, middle fleshy and fibrous mesocarp and inner hard and stony endocarp. E.g. Mango. So, the correct answer is 'Pod'.

Terminator gene

biology seeds - structure and germination germination seed germination the flower

  1. Helps in terminating flowering

  2. Helps in terminating seed germination

  3. Used in hybridisation

  4. None of the above.

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Correct Option: B

In hypogeal germination, plumule comes out of ground due to elongation of

biology seeds - structure and germination germination seed germination the flower

  1. Hypocotyl

  2. Epicotyl

  3. Cotyledons

  4. Both A and B

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Correct Option: B
Explanation:

In this type of germination, the epicotyl elongates and the cotyledons remain below the soil. Pea, mango, maize, rice, gram and groundnut have germination of this kind. So, the correct answer is 'Epicotyl'.

Which of the following comes first out of the soil in the bean seed?

biology seeds - structure and germination germination seed germination the flower

  1. Hypocotyl

  2. Radicle

  3. Leaf foliage

  4. None of the above

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Correct Option: A
Explanation:
The hypocotyl elongates rapidly and arches upwards pulling the cotyledons which move above the soil. Bean, cotton, papaya, gourd, castor and onion have germination of this kind.
So the correct option is 'Hypocotyl'.

Seed dormancy can be broken by exposure to red in ____________.

biology seeds - structure and germination germination seed germination the flower

  1. Lettuce

  2. Pea

  3. Tomato

  4. Onion

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Correct Option: A

Which one of the following statements is not correct regarding vivipary?

biology seeds - structure and germination germination seed germination the flower

  1. Seeds germinate within the fruit while still attached to the mother plant

  2. It usually occurs under highly saline conditions

  3. It occurs in the mangrove plants

  4. It involves a dormancy period for the seed

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Correct Option: A

Identify the correct sequence of stages of germination in pea plant.

biology seeds - structure and germination germination seed germination the flower

  1. Bursting of the seed coat, radicle comes out, coleoptile pushed upward, primary root and leaf foliage developed.

  2. Bursting of the seed coat, radicle comes out, plumule pushed upward, primary root developed.

  3. Bursting of the seed coat, radicle comes out, primary root developed, hypocotyl comes out of the soil.

  4. Bursting of the seed coat, coleoptile pushed upward, radicle comes out, primary root and leaf foliage developed.

Show answer
Correct Option: B
Explanation:
Germination is the process of seeds developing into new plants. First, environmental conditions must trigger the seed to grow.
  1. When water is plentiful, the seed fills with water in a process called imbibition.
  2. The water activates special proteins, called enzymes, that begin the process of seed growth. 
  3. The seed grows a root to access water underground. 
  4. The shoot appears above ground. 
  5. The seed sends a shoot towards the surface, where it will grow leaves to make food that provides energy. 
  6. The leaves continue to grow towards the light source in a process called photomorphogenesis.
So the correct option is 'Bursting of the seed coat, radicle comes out, plumule pushed upward, primary root developed.'

In vivipary type of seed germination, the seeds undergo _________________.

biology seeds - structure and germination germination seed germination the flower

  1. Twelve months of resting period

  2. Six months of resting period

  3. Three months of resting period

  4. No resting period

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Correct Option: A

In germinating oil seeds $\beta$-oxidation of free fatty acids takes place in ______________.

biology seeds - structure and germination germination seed germination the flower

  1. Oleosoines

  2. Glyoxysomes

  3. Mitochondria

  4. Cytosol

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Correct Option: A

In nature, the orchid seeds germinate only in association with _______________.

biology seeds - structure and germination germination seed germination the flower

  1. Myxomycetes

  2. Mycorrhiza

  3. Blue green algae

  4. Actinomycetes

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Correct Option: A