Question

11. Answer question numbers 11.1-11.4 on the basis of your understanding of the following paragraph and the
related studied concepts.
The leaf is the main photosynthetic organ in a plant. It controls gas exchange in plants, controls the amount of
water loss in plants. Upper epidermis cells contain no chloroplasts - which is not true for the guard cells. They
form layers on the upper and lower surface of the leaf. Their function is to prevent water from getting out and
stopping unwanted substances/organisms getting in. The palisade mesophyll layer is where most of the
photosynthesis occurs in the leaf. The palisade cells contain a lot of chloroplasts to help them perform this
photosynthesis. Lower epidermis is the bottom layer of the leaf, and is one cell thick. They may not contain a
cuticle within the lower epidermis, there are some holes found in leaves called stoma. These holes allow gases
to diffuse in and out of the leaves.
The stoma are formed by two highly specialized epidermis cells called guard cells. They are the only epidermis
cells that contain chloroplasts.
Laal blast
yler
ular bu
roosoo
11.1. Mention two function of lower epidermis.
11.2. Where are chloroplasts present in the leaf?
11.3. What are the functions of xylem and phloem in leaf?
11.4. List one structural and one functional difference between upper and lower epidermis
Directions(Q.Nos. 12 - 14 )Each of the following questions consists of two statements, one
is Assertion(A) and the other is Reason(R).Give answer:
(a) Ir both A and R are true and R is a correct explanation of A
(b) If both A and R are true but R is not a correct explanation of A
(c) II A is true but R is false
(d) If A is false but R may be true/false.​

Answer 1

Answer:

Insulin is a hormone produced by the beta cells within the pancreas in response to the intake of food. The role of insulin is to lower blood sugar (glucose) levels by allowing cells in the muscle, liver and fat to take up sugar from the bloodstream that has been absorbed from food, and store it away as energy.