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Consider the following statements and choose the correct answer:<br>1. For the development of viable seeds the double fertilization is very necessary<br>2. The net result of double fertilization is the formation of endosperm from the triploid nucleus<br>3. In Angiosperms very free nuclear divisions take place as in Gymnosperms<br>4. The endosperm nucleus has both maternal and paternal characters showing physiological importance like hybrid vigour

Correct Answer: Only 1, 2 and 4 are true

Consider the following statements regarding Xenia and choose the correct answer:
1. If a white variety (yy) is pollinated with pollen from a yellow variety (YY), one of the male gametes (Y) will unite with the egg (y) to produce a hybrid embryo (Yy) which will act as a heterozygote for yellow endosperm in the next generation
2. The second male gamete (Y) will unite with the two polar nuclei (y, y) and produces the primary endosperm nucleus (Yyy) which is triploid
3. If a yellow endosperm variety (YY) is crossed with pollen from a white grained variety, the grains produced are white like the pollen parent

Consider the following statements.
1. The chain reaction process is used in nuclear bombs to release a vast amount of energy, but in nuclear reactors, there is no chain reaction.
2. In a nuclear reactor, the reaction is controlled, while in nuclear bombs, the reaction is uncontrolled.
3. In a nuclear reactor, all operating reactors are 'critical', while there is no question of 'critically' in case of a nuclear bomb.
4. Nuclear reactors do not use moderators, while nuclear bombs use them.
Which of the above statements about operational principles of a nuclear reactor and a nuclear bomb is/are correct?

Consider the following statements regarding double fertilization and choose the correct answer:
1. At the time of the sperm's approach to the egg nucleus, the male nucleus has the appearance of a continuous thread rolled into a ball
2. It is only the presence of the two nucleoli which serves to distinguish the fertilized egg from the unfertilized egg
3. Finally, the male nucleolus increases in size and fuses with the female nucleolus thus closing the phenomenon of sexual union of the nuclei
4. The fusion of the male gamete with the secondary nucleus results in the formation of a sister embryo

Sue planted 4 times as many apple seeds as she planted orange seeds. 15% of the apple seeds grew into trees, and 10% of the orange seeds grew into trees. If a total of 420 apple trees and orange trees grew from the seeds, how many orange seeds did Sue plant?

Consider the following statements regarding the importance of imbibition to the plants and choose the correct answer:
1. Imbibition causes swelling of seeds and results in the breaking of testa
2. The water moves into ovules which are ripening into seeds by the process of imbibition
3. Imbibition pressure generated during germination of seeds and spores is so enormous that it can break asphalt road and concrete pavements

Consider the following statements regarding the changes which usually occur in the ovule during the development of seed and choose the correct answer:
1. The zygote develops into a fruit
2. The seeds having copious amounts of endosperm tissue are called exalbuminous
3. The exalbuminous seeds usually store reserve food materials in cotyledons
4. The inner integument, if persists, forms the

Fact 1: All dogs like to run.
Fact 2: Some dogs like to swim.
Fact 3: Some dogs look like their masters.

If the first three statements are facts, which of the following statements must also be a fact?
I: All dogs who like to swim look like their masters.
II: Dogs who like to swim also like to run.
III: Dogs who like to run do not look like their masters.

Consider the following statements.
1. Fertilisation of the egg takes place inside the embryo sac.
2. Fertilised ovum form the embryo.
3. Endosperm is generally triploid.
Which of the statements given above are correct?

In which of the following types of endosperm, the first nuclear division of the primary endosperm nucleus is followed by the formation of either a longitudinal or transverse wall in the central cell?

The triploid or the primary endosperm nucleus is formed as a result of the fusion of