Question

Q.2 Assertion and Reason type questions:ans is like this
In the following questions, two statements are given-one labelled Assertion (A)
and the other labelled Reason (R). Read the statements carefully and choose the
correct alternative (A), (B), (C) and (D) as given below.
(A) Both A and R are true and R is correct explanation of the assertion.
(B) Both A and R are true but R is not the correct explanation of the assertion.
(C) A is true but R is false.
(D) A is false but R is true.
i) Assertion: Leguminous plants are nitrogen fixers.
Reason : Leguminous plants have rhizobium in their root nodules.
ii) Assertion : Some green plants are also heterotrophic in nature.
Reason : They grow in soil that is not rich in nutrients.
iii) Assertion: During digestion, minerals and vitamins do not need to be
changed or digested.
Reason : The cells are able to absorb them as they are.
iv) Assertion : The mode of nutrition in herbivores is holozoic.
Reason : They eat only plants.
Q.3 Give Reasons
1. Wheat dough if left in the open, after a few days, starts to emit a foul smell and
becomes unfit for use.

2. Nitrogen is an essential nutrient for plant growth. But farmers who cultivate
pulse crops like green gram, bengal gram, black gram, etc. do not apply
nitrogenous fertilizers during cultivation.
3. Farmers add fertilizers and manures into the soil.
4. We should not eat hurriedly.
5. Humans can not digest grass.
6. Plants do not have digestive system like us.
Q.4.Long Answer Questions:
1.Name different modes of feeding in animals.
2. What role does villi perform in the small intestine?
3. What happens to the food in mouth and esophagus of the digestive tract?
4. Sun is called the ultimate source of energy for all living organisms. How?
5. Explain the two mode of nutrition

Answer 1

Answer:

1- Moreover, the presence of carbohydrate and moisture in the dough provides an optimal environment for various types of microbes to grow over it.

2- Nitrogen is an essential nutrient for plant growth. But farmers who cultivate pulse crops like green gram, bengal gram,black gram, etc. do not apply nitrogenous fertilizers.

3- Then the farmers usually will add manure organic fertilizer to the soil, and its purpose is that: Especially Chicken Manure organic fertilizer will add nitrogen, phosphorus.

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