Cactus Plants

Q.

In case of cactus plants the leaves are modified into spines. Why is it so and how do these plants fulfill their nutritional requirement

Q.

Assertion (A): Desert plants take CO2 at night.

Reason (R): They avoid faster evaporation of transpirational water.

1. Both A and R are false.

2. Both A and R are true, and R is the correct explanation for A.

3. Both A and R are correct, but R is not the explanation for A.

4. A is true, and R is false.

Q. Identify the green part of the cactus given in the image below.

1. Leaf
2. Stem
3. Root
4. Flower

Q.

Identify the error(s) in the given statement:

In some plants like pea, the leaves are modified into spines.

Q. What adaptation has the cactus developed to protect itself from predators and reduce transpiration?

1. Flowers
2. Spines
3. Fruits
4. Long roots

Q.

Which part of the cactus plant is modified into spine?

1. Stem

2. Roots

3. Leaves

4. Branches

Q. Match the adaptation seen in cacti with the possible reason.

$\begin{array}{cc}Adaptation& Reason\\ a.Leavesmodifiedintospines& i.Maximumabsorptionofwaterfromground\\ b.Succulentstems& ii.Toreducesurfaceareafortraspiration\\ c.Welldevelopedrootsystem& iii.Keepthestomataclosedduringday\\ d.Efficientuseofcarbondioxidegas& iv.Toholdmorewater.\end{array}$

1. a-i, b-ii, c-iii, d-iv
2. a-ii, b-iv, c-i, d-iii
3. a-iv, b-ii, c-iv, d-iii
4. a-iii, b-ii, c-i, d-iv

Q.

Mention three adaptations of cacti for life in the desert? [3 MARKS]

Q.

Appu washed two bedsheets and wanted to dry them. He took the first wet bed sheet, opened it fully and put it in the sun. He folded the second wet bedsheet and put it out to dry. After one hour, what do you think he found regarding whether they were wet or dry? Choose the most probable option.

1. Both bedsheets were fully wet.

2. Some part of the first bedsheet was wet while the second bedsheet dried completely.

3. Both bedsheets were equally dry.

4. First bedsheet was fully dry while the inner folds of the second bedsheet were still wet.

Q.

Match the reasons given in column 2 with the features of cacti in column 1. There can be multiple matches.

$\begin{array}{cc}Featuresofcacti& Reasons\\ a.\text{Spiny leaves}& \left(i\right)\text{Absorbing water from depths of soil}\\ b.\text{Thick, round fleshy stems}& \left(ii\right)\text{Prevent loss of water by transpiration}\\ c.\text{Deep roots}& \left(iii\right)\text{Store water}\\ d.\text{Closed stomata during the day}& \left(iv\right)\text{Prevent animals from eating the cactus}\\ e.\text{Carbon dioxide storage during the night}& \end{array}$

1. a – (iv) ; b – (ii) ; c - (iv), (iii) ; d – (i) ; e – (iii), (ii)

2. a – (ii), (iv) ; b – (ii), (iv) ; c - (i) ; d – (iii) ; e – (iii), (ii)

3. a – (ii), (iv) ; b – (ii) ; c - (i) ; d – (iii) ; e – (iii), (ii)

4. a – (ii), (iv); b – (ii), (iii) ; c - (i) ; d – (ii) ; e – (ii)

Q.

Match the reasons given in column 2 to the features of cacti in column 1.

$\begin{array}{cc}Featuresofcacti& Reasons\\ a.\text{Spiny leaves}& \left(i\right)\text{Absorbing water from depths of soil}\\ b.\text{Thick, round fleshy stems}& \left(ii\right)\text{Prevent loss of water by transpiration}\\ c.\text{Deep roots}& \left(iii\right)\text{Store water}\\ d.\text{Closed stomata during the day}& \left(iv\right)\text{Prevent animals from eating the cactus}\\ e.\text{Carbon dioxide storage during the night}& \end{array}$

Choose the correct option.

1. a – (iv) ; b – (ii) ; c - (iv), (iii) ; d – (i) ; e – (iii), (ii)

2. a – (ii), (iv) ; b – (ii), (iv) ; c - (i) ; d – (iii) ; e – (iii), (ii)

3. a – (ii), (iv) ; b – (ii) ; c - (i) ; d – (iii) ; e – (iii), (ii)

4. a – (ii), (iv); b – (ii), (iii) ; c - (i) ; d – (ii) ; e – (ii)

Q.

Appu washed two bedsheets and wanted to dry them. He took the first wet bed sheet, opened it fully and put it in the sun. He folded the second wet bedsheet and put it out to dry. After one hour, what do you think was his observation? Choose the most probable option.

1. Both bedsheets were equally dry.

2. First bedsheet was fully dry while the inner folds of the second bedsheet were still wet.

3. Both bedsheets were fully wet.

4. Some part of the first bedsheet was wet while the second bedsheet dried completely.

Q. Choose the correct option/s for the adaptations seen in cacti.

1. Leaves are turned into spines.
2. Stems become bulbous and full of water.
3. Root systems are well developed.
4. Tendrils are found.

Q. The colour of flower petals is due to the presence of

1. Xanthophyll
2. Carotenes
3. Phycoerythrin
4. Anthocyanin

Q. The spines seen on desert plants are modified leaves.

1. True
2. False

Q.

Appu washed two bedsheets and wanted to dry them. He took the first wet bed sheet, opened it fully and put it in the sun. He folded the second wet bedsheet and put it out to dry. After one hour, what do you think he found regarding whether they were wet or dry? Choose the most probable option.

1. First bedsheet was fully dry while the inner folds of the second bedsheet were still wet.

2. Some part of the first bedsheet was wet while the second bedsheet dried completely.

3. Both bedsheets were fully wet.

4. Both bedsheets were equally dry.

Q. 27. What is the difference between vapourisation and evaporation

Q. Identify the green part of the cactus given in the image below.

1. Leaf
2. Stem
3. Flower
4. Root

Q.

Match the reasons given in column 2 to the features of cacti in column 1. There can be multiple matches.

$\begin{array}{cc}Featureofcacti& Reasons\\ a.\text{Spiny leaves}& \left(i\right)\text{Absorbing water from depths of soil}\\ b.\text{Thick, round fleshy stems}& \left(ii\right)\text{Prevent loss of water by transpiration}\\ c.\text{Deep roots}& \left(iii\right)\text{Store water}\\ d.\text{Closed stomata during the day}& \left(iv\right)\text{Prevent animals from eating the cactus}\\ e.\text{Carbon dioxide storage during the night}& \end{array}$

1. a – (ii), (iv) ; b – (ii) ; c - (i) ; d – (iii) ; e – (iii), (ii)

2. a – (ii), (iv); b – (ii), (iii) ; c - (i) ; d – (ii) ; e – (ii)

3. a – (iv) ; b – (ii) ; c - (iv), (iii) ; d – (i) ; e – (iii), (ii)

4. a – (ii), (iv) ; b – (ii), (iv) ; c - (i) ; d – (iii) ; e – (iii), (ii)

Q. Which part of the cactus plant performs photosynthesis?

1. Spines
2. Flowers
3. Stems
4. Roots

Q. What adaptation has the cactus developed to protect itself from predators and reduce transpiration?

1. Spines
2. Flowers
3. Fruits
4. Long roots

Q.

Which part of the plant performs photosynthesis on desert plants?