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 & cannot exert enough force to push the soil upward.
Reason — Seeds sown very deep in the soil fail to germinate because of two main reasons:
- No proper supply of oxygen (for respiration).
- Insufficient pushing force in the embryonic parts (hypocotyl and epicotyl) to break through the upper layers of soil.
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