When setting up a potometer, the shoot to be used is cut under water. This is to avoid:

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47. When setting up a potometer, the shoot to be used is cut under water. This is to avoid:

Cutting the shoot under water prevents air bubbles from entering the xylem vessels. Air bubbles would block the continuous column of water, disrupting water transport and making the potometer readings inaccurate. The correct option is B. The entry of air into the xylem.

48. Newly transplanted seedlings wilt on a windy sunny day. This is:

On a windy, sunny day, the rate of transpiration (water loss from leaves) is very high. Newly transplanted seedlings often have damaged roots or an underdeveloped root system, making them unable to absorb water from the soil fast enough to replace the water lost through transpiration. This imbalance leads to a net loss of water and wilting. The correct option is B. Because they lose water faster than they are absorbing.

49. In an experiment, to determine a change in mass over time, a fixed quantity of

This question is incomplete. Please provide the full text of the question for a complete answer.

50. Brown eye (B) is dominant over blue eye (b). A heterozygous brown-eyed man (Bb) marries a blue-eyed woman (bb). What is the probability of this couple producing blue-eyed offspring?

Determine the genotypes of the parents.
- Heterozygous brown-eyed man: $\text{Bb}$
- Blue-eyed woman: $\text{bb}$
Set up a Punnett square to determine the possible offspring genotypes.
$\begin{array}{|c|c|c|} \hline & \text{B} & \text{b} \\ \hline \text{b} & \text{Bb} & \text{bb} \\ \hline \text{b} & \text{Bb} & \text{bb} \\ \hline \end{array}$
Identify the probability of blue-eyed offspring.
- Blue eyes are represented by the genotype $\text{bb}$ .
- From the Punnett square, two out of four possible offspring genotypes are $\text{bb}$ .
- The probability is $\frac{2}{4} = \frac{1}{2}$ . The probability of producing blue-eyed offspring is $\boxed{\mathbf{\frac{1}{2}}}$ .

When setting up a potometer, the shoot to be used is cut under water. This is to avoid:

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Step-by-step solution

Determine the genotypes of the parents.

Set up a Punnett square to determine the possible offspring genotypes.

Identify the probability of blue-eyed offspring.

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