A: More than one pollen tubes can enter an embryo sac
R: Double fertization can occur by contributin of gametes from different pollens

Options

A. if both assetion A reason are ture and the reason is the correct explanation of the assertion then mark
B. if both assertion & reason are ture and the reason is not the correct explanation of the assertin then mark
C. if assertion is true statement but reason is false then mark
D. if both assertion and reason are flase statements then mark

Answer

To solve the assertion and reason question, we will analyze both statements step by step.

### Step-by-Step Solution:

1. **Understanding the Assertion**:
- The assertion states that "more than one pollen tube can enter an embryo sac."
- In flowering plants (angiosperms), typically, only one pollen tube penetrates the embryo sac. Each pollen grain germinates to form a single pollen tube that carries male gametes to the ovule.

2. **Evaluating the Assertion**:
- Since only one pollen tube can enter the embryo sac at a time, the assertion is **false**.

3. **Understanding the Reason**:
- The reason states that "double fertilization can occur by contribution of gametes from different pollens."
- Double fertilization involves one male gamete fusing with the egg cell to form the zygote, and the other male gamete fusing with the polar nuclei to form the primary endosperm nucleus (PEN).

4. **Evaluating the Reason**:
- In double fertilization, both male gametes come from the same pollen tube, as each pollen tube carries two male gametes. Therefore, the reason is also **false** because it incorrectly suggests that gametes from different pollen tubes are involved.

5. **Conclusion**:
- Both the assertion and the reason are false. Hence, the correct answer is that both statements are false.

### Final Answer:
Both assertion and reason are false.