Biology
Seeds sown very deep in the soil fail to germinate because they
- cannot exert enough force to push the soil upward.
- do not get enough sunlight.
- get too much water.
- do not get enough oxygen.
Answer
Do not get enough oxygen.
Reason — The best answer among the given options is that seeds do not get enough oxygen. Seeds sown very deep in the soil fail to germinate mainly due to lack of oxygen for respiration. They may also fail because the embryonic parts, such as the hypocotyl and epicotyl, may not have sufficient force to break through the upper layers of soil.
Sunlight is not required for germination, and deep soil usually does not harm seeds because of excess water alone.
Related Questions
Fill in the blanks by choosing the correct alternative
- In a dry seed, the embryo is in …………… state. (active/quiescent)
- Water is absorbed by the seed mainly through …………… . (entire surface/micropyle)
- Very low temperature …………… the growth of embryo. (inhibits/destroys)
- Germination in Pea is …………… . (epigeal/hypogeal)
- Coleoptile is a part found in the germinating …………… . (castor/maize)
- Alkaline pyrogallic acid is used for absorbing …………… during experiments on germination. (oxygen/carbon dioxide)
Which one of the following plant parts is correctly matched with one of its stated characteristic?
- Mango seed → aleurone layer
- Bean seed → endosperm
- Maize grain → coleoptile
- Wheat grain → exalbuminous
Fruit is a ripened :
- Ovary
- Embryo
- Ovule
- Zygote
Which of the following is the largest seed ?
- Watermelon
- Pumpkin
- Double coconut
- Mango