Which of the following statements are correct regarding common differences between plant and animal cells?<br>1. Plant cells have cellulose cell wall, while animal cells lack it.<br>2. Plant cells lack plasma membrane, while animal cells have it.<br>3. Mature plant cell have a large vacuole, while animal cells have numerous small vacuoles.

Large, medium and small ships are used to bring water. 4 large ships carry as much water as 7 small ships, 3 medium ships carry the same amount of water as 2 large ships and 1 small ship. 15 large, 7 medium and 14 small ships, each made 36 journeys and brought a certain quantity of water. In how many journeys would 12 large, 14 medium and 21 small ships bring the same quantity ?

A

25

B

29

C

32

D

49

A continuous process is set up for treatment of wastewater. Each day, 103 kg cellulose and 105 kg bacteria enter in the feed stream, while 102 kg cellulose and 1.5 x 102 kg bacteria leave in the effluent. The rate of cellulose digestion by the bacteria is 8 x 102 kg d-1. The rate of bacterial growth is 4x 102 kg d-l; the rate of cell death by lysis is 6 x 102 kg d-1. Write balances for cellulose and bacteria in the system.

A

1× 103 kg, 9 × 103 kg

B

1× 102 kg, 9.965 × 104 kg

C

1× 103 kg, 9.964 × 104 kg

D

1× 102 kg, 9 × 103 kg

Which of the following statement(s) is/are CORRECT for antigen activated effector T cells?
P. CD4+ cells make contact with macrophages and stimulate their microbicidal activity.
Q. CD4+ cells make contact with B cells and stimulate them to differentiate into plasma cells.
R. CD8+ cells make contact with B cells and stimulate them to differentiate into plasma cells.
S. CD8+ cells make contact with virus infected cells and kill them.

A

Q only

B

Q and S only

C

P, Q and S only

D

P, Q, R and S

Consider the following statements regarding collenchyma and choose the correct answer:
1. The cells of collenchyma contain protoplasm and are living
2. Presence of cellulose and pectic substances in the cell wall accounts for the high water absorbing capacity to the cells
3. Collenchyma is the tissue of secondary body
4. Collenchyma originates from elongated cells that resemble procambium

A

Only 1 and 3 are true

B

Only 2, 3 and 4 are true

C

Only 1 and 2 are true

D

Only 1, 2 and 4 are true

Forest fires feed on decades-long accumulations of debris and leap from the tops of young trees into the branches of mature trees. Fires that jump from treetop to treetop can be devastating. In old-growth forests, however, the shade of mature trees keeps thickets of small trees from sprouting, and the lower branches of mature trees are too high to catch the flames.
This paragraph best supports the statement that

A

forest fire damage is reduced in old-growth forests.

B

small trees should be cut down to prevent forest fires.

C

mature trees should be thinned out to prevent forest fires

D

forest fires do the most damage in old-growth forests.

E

old-growth forests have a larger accumulation of forest debris.

I. All the offices on the 9th floor have wall-to-wall carpeting. II. No wall-to-wall carpeting is pink. III.None of the offices on the 9th floor has pink wall-to-wall carpeting. If the first two statements are true, the third statement is

A

true

B

false

C

uncertain

D

none

If the first two statements are true, the third statement is :
I. All the offices on the 9th floor have wall-to-wall carpeting.
II. No wall-to-wall carpeting is pink.
III. None of the offices on the 9th floor has pink wall-to-wall carpeting.

A

true

B

false

C

[C. uncertain

Direction : Two statements I and II are given. These statement may be either independent causes or may be effects of independent causes or a common cause. One of these statements may be the effect of the other statements. Read both the statements and decide which of the following answer choice correctly depicts the relationship between these two statements. Mark answer :

I. The government has decided to give tax benefits for small savings for investments and benefit accruals. However, all withdrawals of such savings are to be taxed.
II. People have been investing more in small savings than in equity market to avail maximum tax benefits.

A

Statement I is the cause and statement II is its effect.

B

Statement II is the cause and statement I is its effect.

C

Both the statements I and II are independent causes.

D

Both the statements I and II are effects of independent causes.

E

Both the statements I and II are effects of some common cause.

Determine the correctness or otherwise of the following Assertion (A) and the Reason (R).
Assertion: The enzymatic degradation of cell wall to obtain single cell called protoplast has helped immensely in developing somatic cell genetics in plants.
Reason: In plants or animals, fusion of two cells must occur through the plasma membrane.

A

Both (A) and (R) are true and (R) is the correct reason for (A)

B

Both (A) and (R) are true and (R) is not the correct reason for (A)

C

(A) is true but (R) is false

D

(A) is false but (R) is true

How many H+ ions are transported by the vacuole H+-ATPase pump and the vacuole H+-phosphatase pump per hydrolysis of ATP and pyrophosphate respectively?

A

1, 1

B

1, 2

C

2, 1

D

2, 2