The amount of water reabsorbed from tubular region of nephron depend upon,i. The amount of soluble waste to be removed from bloodii. The amount of water present in bloodiii. Length of nephroniv. Glucose reabsorptiona. ib. ii and iiic. ivd. i and ii17The light from the sun constitutes a parallel ray of light. The rays were converged bya convex lens at the sharp bright spot formed on the paper. The bright spot got on thepaper isi) a real image of the Sunii) a virtual image of the Suniii) an inverted image of the Suniv) an erect image of the Suna. i) & ii)b. i) & iii)c. i) & iv)d. ii) & iii)

The amount of water reabsorbed from the tubular region of the nephron depends on several factors. Let's break it down step by step:

i. The amount of soluble waste to be removed from the blood: The reabsorption of water is closely linked to the removal of waste products from the blood. The more waste that needs to be eliminated, the more water will be reabsorbed.

ii. The amount of water present in the blood: If there is a higher concentration of water in the blood, less water will need to be reabsorbed by the nephron. Conversely, if there is a lower concentration of water, more water will be reabsorbed.

iii. Length of the nephron: The length of the nephron can also affect the amount of water reabsorbed. A longer nephron provides more opportunities for water reabsorption.

iv. Glucose reabsorption: Glucose reabsorption is not directly related to water reabsorption. However, it is an important process in the nephron. Glucose is actively reabsorbed from the tubular region, and this process can indirectly affect the reabsorption of water.

Now, let's move on to the second question:

The light from the sun constitutes a parallel ray of light. These rays are converged by a convex lens and form a sharp bright spot on the paper. The characteristics of this bright spot can help us determine the type of image formed:

i) a real image of the Sun: A real image is formed when light rays actually converge at a specific point. In this case, the bright spot on the paper is not a real image because the rays are not actually converging.

ii) a virtual image of the Sun: A virtual image is formed when light rays appear to converge at a specific point, but they do not actually intersect. The bright spot on the paper is a virtual image because the rays are appearing to converge.

iii) an inverted image of the Sun: An inverted image is formed when the top and bottom of the object are flipped in relation to the image. Since the bright spot on the paper is a virtual image, we cannot determine if it is inverted or not.

iv) an erect image of the Sun: An erect image is formed when the top and bottom of the object are not flipped in relation to the image. Since the bright spot on the paper is a virtual image, we cannot determine if it is erect or not.

Based on the given options, the correct answer would be (b) i) & iii).