Ms. Chambers is among the forecasters who predict that the

1. This is an OG question. You may see no choice contains the 'will rise' option. So, this must be an acceptable version. In some connotations, even the simple present may stand for future events. Like, the school reopens middle of next, month or Hilary is expected to run for the Prez in 2016.
2. There is also a view that only when we use the fanboy connector ‘and’ should we really look for strict physical //ism, such as in this case, 'will drop and will rise'. But when we use the subordinate connector while, we can still validly use the present tense rises.

This usage is called future conditional - such usage is also observed in if and when clauses:

If I eat Pizza, I shall fall sick.
I shall talk to you when I have time.

Similarly,
The rate of addition to arable lands will drop while the rate of loss rises.

The Rate is singular hence rise is wrong, rises is correct.

E is absolutely redundant and hence D wins.

D also maintains Parallelism.

Here's the version created via the use of choice (B).

Ms. Chambers is among the forecasters who predict that the rate of addition to arable lands will drop while it rises for loss.

Notice that "it" is not a demonstrative pronoun such as "that." "It" is a personal pronoun. So, "it" must refer to a noun that appears elsewhere in the sentence.

In this case "it" must refer to "the rate of addition to arable lands," because "it" has to refer to a noun that appears elsewhere, and what appears elsewhere is "the rate of addition to arable lands."

So, let's see what we get when we replace "it" with what "it" refers to.

Ms. Chambers is among the forecasters who predict that the rate of addition to arable lands will drop while the rate of addition to arable lands rises for loss.

That sentence is clearly nonsensical.

So, now, we can see clearly what's wrong with choice (B).

"D" seems most obvious choice on two counts

1) the rate of xyz is singular.
2) E is redundant and B has unclear antecedent IT

pls feel free to correct me if i am wrong

thanks

64. Ms. Chambers is among the forecasters
who predict that
the rate of addition to arable lands will drop
while those of loss rise.

(A) those of loss rise -> No antecedent for pronoun those
(B) it rises for loss -- > in comparison when ”it” appear with second entity it denote exactly the same antecedent in this case it refer to “the rate of addition” which makes nonsensical statement.
(C) those of losses rise --> same as choice A
(D) the rate of loss rises --> Correct (the Rate ... rises )
(E) there are rises for the rate of loss -- Wordy and unidiomatic

Yes , it is an Idiom

X will rise , while Y rises

Your analysis regarding parallelism is spot on. What follows "while" does not have to be strictly parallel to what precedes it, and thus there is no parallelism type flaw associated with choice (E).

The real issue with choice (E) is that the meaning expressed by the version created via the use of (E) is nonsensical.

What does "there are rises for the rate of loss" even mean? Does it mean that the rate of loss rises? That's not what it says.

"There are increases in the rate of loss" would work, but "there are rises for the rate of loss" is practically gibberish.

D it is!!

The rate is singular. Immediately elminate A, C and E.
That leaves B and D. B has modifer problem, not clear what "it" is referring to. D is the winner.

(A) those of loss rise Wrong - "those...rise" is not consistent with singular referent, rate
(B) it rises for loss Wrong - "for loss" is not structurally similar to "of addition"
(C) those of losses rise Wrong - "those...rise" is not consistent with singular referent, rate
(D) the rate of loss rises Correct
(E) there are rises for the rate of loss Wrong - inverted sentence structure is unneeded and not structurally similar to the "rate of addition"

IMO D

Can someone explain the issue with timing in this sentence please?

Is it ok to use Future (will drop) with Present (rises) in this context? Is the part "while the rate of loss rises" already out of "prediction"?

No, "drop" is not plural here - the verb is "will drop" which may be singular or plural. "It will drops" is wrong.

Hey guys.
Can anybody explain why we do not use future tense? lands will drop while the rate of loss rises

Thank you

Ms. Chambers is among the forecasters who predict that the rate of addition to arable lands will drop while those of loss rise.
(A) those of loss rise -- those should logically refer to rate but those is plural whereas rate is singular
(B) it rises for loss -- it refers to rate of addition to arable lands --> illogical
(C) those of losses rise -- same as A
(D) the rate of loss rises -- Correct
(E) there are rises for the rate of loss -- wordy and redundant

Answer D

When I met Liza yesterday, it was the first time I _____ her since Christmas.

a. saw
b. had seen
c. have seen
d. have been seen

sir/maam, can you please help me to know the correct answer and explain it. and why the other option is wrong

Posted from my mobile device

Here's the correct version:

Ms. Chambers is among the forecasters who predict that the rate of addition to arable lands will drop while the rate of loss rises.

What we have here is the present tense used in describing a future event. "The rate of loss rises" is used to describe an event that will occur in the future.

Here's why.

Think about the meaning of the following:

The rate of addition to arable lands will drop while the rate of loss will rise.

Notice that that sentence does not actually say that the two events will occur at the same time. "X will occur while y will occur," conveys that x will occur, not while y occurs, but rather while it is the case that y WILL occur. In other words, the event of y occurring is even further in the future than the event of x occurring.

So, in order to convey that two events will occur at the same time in the future, we use the future tense for one and the present tense for the other.

Here are some more examples:

As Jim is painting the barn, Sue will repair the stable.

Julia will greet the guests while Marco is setting up.

So, in fact, "the rate of addition to arable lands will drop while the rate of loss rises," conveys that one event will occur while the other occurs in the future.

thanks very much... i always mess up when it comes to understanding the rules of how to identify whether IT refers to which antecedent

Can you help me with concrete check points which can give me an idea abt IT's antecedent ( if possible with example ) it will be a great help

thanks in advance